simple case study examples in java

50 Java Projects with Source Code for All Skill Levels

By Faraz - February 26, 2024

50 Java projects with complete source code, suitable for beginners to experts. Dive into practical coding with these hands-on examples.

Java, being one of the most popular programming languages globally, offers a vast array of opportunities for enthusiasts to practice and enhance their coding skills. Engaging in practical projects is one of the most effective ways to master Java programming. Here, we'll explore 50 Java projects with source code across different levels of complexity, suitable for beginners, intermediates, and advanced learners.

Table of Contents

Introduction to java projects.

Java projects provide hands-on experience and are instrumental in reinforcing theoretical concepts. They offer a practical understanding of Java's syntax, structure, and functionality. Moreover, working on projects enables developers to tackle real-world problems, fostering creativity and problem-solving skills.

1. Calculator

Houari ZEGAI's Calculator project offers a great opportunity for beginners to delve into Java programming. This simple yet effective project helps learners understand fundamental concepts like variables, operators, and basic user input/output. With clear, commented code, ZEGAI's Calculator is a fantastic starting point for those new to Java development. By studying and tinkering with this project, beginners can grasp core principles while gaining confidence in their coding abilities.

2. Guess the Number Game

The "Guess the Number" game is a classic Java project suitable for programmers of all skill levels. This interactive game challenges players to guess a randomly generated number within a specified range. With simple yet engaging gameplay, the "Guess the Number" project provides an excellent opportunity for beginners to practice essential Java concepts while having fun.

3. Currency Converter

The Currency Converter project is a practical and useful Java application that allows users to convert between different currencies. This project is suitable for programmers at various skill levels, providing an opportunity to apply Java programming concepts in a real-world scenario.

In the Currency Converter project, users input an amount in one currency and select the currency they wish to convert it to. The application then retrieves the latest exchange rates from a reliable source, such as an API, and performs the conversion calculation. By implementing this functionality, learners can gain valuable experience working with APIs, handling user input, and performing mathematical operations in Java.

4. Digital Clock

The Digital Clock project is a straightforward yet engaging Java application that displays the current time in a digital format. This project is suitable for beginners and intermediate programmers alike, offering an opportunity to practice essential Java concepts while creating a useful utility.

In the Digital Clock project, programmers utilize Java's date and time functionality to retrieve the current system time and display it on the screen. By incorporating graphical user interface (GUI) components such as labels and timers, learners can create an interactive clock display that updates in real-time. This hands-on approach allows beginners to familiarize themselves with GUI programming concepts while practicing core Java skills.

5. ToDo App

The ToDo App project is a practical Java application that helps users organize their tasks and manage their daily activities efficiently. This project is suitable for programmers looking to develop their Java skills while creating a useful productivity tool.

In the ToDo App project, users can add tasks to a list, mark them as completed, and remove them as needed. By implementing features such as user input handling, task manipulation, and list management, learners gain valuable experience in Java programming fundamentals. Additionally, this project provides an opportunity to explore concepts like data structures, file handling, and user interface design.

6. QRCodeFX

QRCodeFX is an exciting Java project that allows programmers to generate QR codes dynamically. This project leverages JavaFX, a powerful library for building graphical user interfaces, to create an interactive application for generating and displaying QR codes.

7. Weather Forecast App

The Weather Forecast App project is an exciting Java application that provides users with up-to-date weather information for their location and other selected areas. This project combines Java programming with APIs to create a dynamic and user-friendly weather forecasting tool.

In the Weather Forecast App, users can input their location or select a specific city to view current weather conditions, including temperature, humidity, wind speed, and more. By integrating with a weather API, such as OpenWeatherMap, programmers can retrieve real-time weather data and display it in a clear and visually appealing format.

8. Temperature Converter Tool

The Temperature Converter Tool is a handy Java application that allows users to convert temperatures between different units, such as Celsius, Fahrenheit, and Kelvin. This project provides a practical opportunity for programmers to develop their Java skills while creating a useful utility for everyday use.

In the Temperature Converter Tool, users can input a temperature value along with the unit of measurement (e.g., Celsius, Fahrenheit, or Kelvin) and select the desired output unit. The application then performs the conversion calculation and displays the result, allowing users to quickly and easily convert temperatures with precision.

9. Word Counter Tool

The Word Counter Tool is a versatile Java application designed to analyze text and provide valuable insights into word frequency and usage. This project offers programmers a practical opportunity to hone their Java skills while creating a useful utility for text analysis.

In the Word Counter Tool, users can input a block of text or upload a text file, and the application will analyze the content to determine the frequency of each word. By utilizing Java's string manipulation capabilities and data structures such as maps or arrays, programmers can efficiently process the text and generate a comprehensive word count report.

10. Scientific Calculator

The Scientific Calculator project is an advanced Java application that provides users with a wide range of mathematical functions and operations beyond basic arithmetic. This project is ideal for programmers looking to expand their Java skills while creating a powerful utility for scientific calculations.

In the Scientific Calculator, users can input mathematical expressions, including functions such as trigonometric, logarithmic, and exponential functions, and the application will evaluate and display the result accurately. By leveraging Java's math libraries and implementing parsing algorithms, programmers can create a robust calculator capable of handling complex mathematical computations with precision.

11. Tic Tac Toe

The Tic Tac Toe project is a classic Java game that provides users with an opportunity to engage in a fun and strategic multiplayer experience. This project is perfect for programmers looking to apply their Java skills while creating an interactive game with simple rules and dynamic gameplay.

In the Tic Tac Toe game, two players take turns marking spaces on a 3x3 grid with their respective symbols (typically X and O), aiming to form a horizontal, vertical, or diagonal line of their symbols before their opponent. By implementing logic to handle user input, validate moves, and check for win conditions, programmers can create a fully functional and enjoyable game experience.

12. Drag and Drop Application

The Drag and Drop Application is a dynamic Java project that enables users to interact with graphical elements by dragging and dropping them across the application's interface. This project provides programmers with an opportunity to explore Java's graphical user interface (GUI) capabilities while creating an intuitive and interactive user experience.

13. Snake Game

The Snake Game project is a classic Java game that provides users with an entertaining and addictive gaming experience. This project offers programmers an opportunity to apply their Java skills while creating a dynamic and interactive game with simple yet challenging gameplay mechanics.

In the Snake Game, players control a snake that moves around a grid, consuming food items to grow longer while avoiding collisions with the walls of the grid or the snake's own body. By implementing logic to handle player input, update the snake's position, and detect collisions, programmers can create a compelling and immersive gaming experience.

14. Resume Builder

The Resume Builder project is a practical Java application designed to assist users in creating professional resumes efficiently. This project offers programmers an opportunity to apply their Java skills while developing a useful tool for individuals seeking to showcase their qualifications and experiences effectively.

15. Student Management System

The Student Management System project is a comprehensive Java application designed to streamline administrative tasks related to student information and academic records. This project offers programmers an opportunity to apply their Java skills while developing a robust and efficient system for managing student data.

In the Student Management System, administrators can perform various tasks such as adding new students, updating existing records, managing course enrollments, and generating reports. By implementing features such as database integration, user authentication, and data validation, programmers can create a reliable and user-friendly platform for organizing and accessing student information.

16. Rock Paper Scissors

The Rock Paper Scissors project is a classic Java game that provides users with a simple yet entertaining gaming experience. This project offers programmers an opportunity to practice their Java skills while creating a fun and interactive game of chance.

In the Rock Paper Scissors game, players compete against the computer by selecting one of three options: rock, paper, or scissors. The winner is determined based on the rules of the game: rock beats scissors, scissors beats paper, and paper beats rock. By implementing logic to handle player input, generate random computer choices, and determine the outcome of each round, programmers can create an engaging gaming experience.

17. Hangman Game

The Hangman Game project is a classic Java game that provides users with a challenging and engaging word-guessing experience. This project offers programmers an opportunity to practice their Java skills while creating a fun and interactive game of wit and strategy.

In the Hangman Game, players attempt to guess a secret word by suggesting letters one at a time. For each incorrect guess, a part of a hangman figure is drawn. The game continues until the player correctly guesses the word or the hangman figure is completed. By implementing logic to handle player input, manage the game state, and select random words, programmers can create an immersive gaming experience.

The Webcam Application project is a Java application designed to interface with a webcam device and capture video or images. This project offers programmers an opportunity to apply their Java skills while creating a versatile tool for webcam usage.

19. Attendance Management System

The Attendance Management System project is a comprehensive Java application designed to streamline attendance tracking and management processes in educational institutions or workplaces. This project offers programmers an opportunity to apply their Java skills while developing a robust and efficient system for managing attendance records.

In the Attendance Management System, administrators can perform various tasks such as recording attendance, generating attendance reports, managing leave requests, and tracking attendance trends over time. By implementing features such as user authentication, data encryption, and access control, programmers can create a secure and reliable platform for monitoring attendance data.

20. Chess Game

The Chess Game project is a Java application that offers users a classic and strategic gaming experience. This project provides programmers with an opportunity to apply their Java skills while creating a sophisticated and engaging game of chess.

In the Chess Game, players take turns moving their pieces across an 8x8 grid, aiming to capture their opponent's pieces and ultimately checkmate their opponent's king. By implementing logic to handle player input, validate moves, and simulate game states, programmers can create a challenging and immersive gaming experience.

21. Vehicle Rental Management System

The Vehicle Rental Management System is a comprehensive Java application designed to streamline the process of managing vehicle rentals for rental agencies or businesses. This project offers programmers an opportunity to apply their Java skills while developing a robust and efficient system for handling rental operations.

In the Vehicle Rental Management System, administrators can perform various tasks such as adding new vehicles to the inventory, managing rental reservations, tracking rental durations and payments, and generating reports. By implementing features such as database integration, user authentication, and data validation, programmers can create a reliable and user-friendly platform for managing vehicle rentals.

22. Quiz App

The Quiz App project is a Java application designed to provide users with an interactive and educational quiz experience. This project offers programmers an opportunity to apply their Java skills while creating a dynamic and engaging platform for quiz-taking.

In the Quiz App, users can choose from a variety of quiz topics or categories, such as science, history, literature, or general knowledge. The application presents users with multiple-choice questions related to the selected topic and provides instant feedback on their answers. By implementing logic to handle user input, track scores, and display quiz results, programmers can create an immersive and rewarding quiz experience.

23. Voting Management System

The Voting Management System is a sophisticated Java application designed to facilitate the management of voting processes in elections or organizational decision-making. This project offers programmers an opportunity to apply their Java skills while developing a secure and efficient system for managing voting operations.

In the Voting Management System, administrators can oversee various aspects of the voting process, including voter registration, ballot creation, voter authentication, vote counting, and result reporting. By implementing features such as user authentication, encryption algorithms, and audit trails, programmers can create a robust and tamper-resistant platform for conducting fair and transparent elections.

24. Electricity Billing System

The Electricity Billing System is a Java application designed to automate and streamline the process of managing electricity bills for customers. This project offers programmers an opportunity to apply their Java skills while developing an efficient and user-friendly system for billing and invoicing.

In the Electricity Billing System, administrators can perform various tasks such as adding new customers, recording meter readings, calculating electricity consumption, generating bills, and processing payments. By implementing features such as database integration, billing algorithms, and user interfaces, programmers can create a reliable and accurate platform for managing electricity billing operations.

25. Online Shopping Cart (E-Commerce Website)

The Online Shopping Cart project is a comprehensive Java application designed to provide users with a seamless and convenient online shopping experience. This project offers programmers an opportunity to apply their Java skills while developing a feature-rich and user-friendly e-commerce platform.

In the Online Shopping Cart, users can browse through a catalog of products, add items to their cart, and proceed to checkout to complete their purchase. By implementing features such as user authentication, product search functionality, shopping cart management, and secure payment processing, programmers can create a robust and reliable platform for online shopping.

26. Online BookStore

The Online Bookstore project is a dynamic Java application that provides users with a convenient platform to browse, search, and purchase books online. This project offers programmers an opportunity to apply their Java skills while developing a comprehensive and user-friendly e-commerce platform specifically tailored for books.

In the Online Bookstore, users can explore a vast catalog of books across different genres, authors, and topics. They can easily search for specific titles, view book details, read reviews, and add books to their shopping cart for purchase. By implementing features such as user authentication, secure payment processing, and order management, programmers can create a seamless and enjoyable shopping experience for book enthusiasts.

27. Connect4

The Connect4 Game project is a Java application that offers users a classic and engaging gaming experience. This project provides programmers with an opportunity to apply their Java skills while developing a strategic and entertaining game of Connect 4.

In the Connect4 Game, two players take turns dropping colored discs into a vertical grid with the goal of connecting four discs of their color horizontally, vertically, or diagonally. By implementing logic to handle player input, validate moves, and detect winning conditions, programmers can create an immersive and challenging gaming experience.

28. Event Management System

The Event Management System is a comprehensive Java application designed to streamline the planning and organization of events for various purposes, such as conferences, weddings, or corporate gatherings. This project offers programmers an opportunity to apply their Java skills while developing a versatile and efficient system for managing event logistics.

In the Event Management System, administrators can perform various tasks such as creating event schedules, managing guest lists, coordinating vendors and suppliers, and tracking expenses and budgets. By implementing features such as user authentication, calendar integration, and communication tools, programmers can create a centralized platform for planning and executing events seamlessly.

29. Puzzle Game

The Puzzle Game project is an engaging Java application that challenges users with a variety of mind-bending puzzles to solve. This project provides programmers with an opportunity to apply their Java skills while creating an entertaining and intellectually stimulating gaming experience.

In the Puzzle Game, players are presented with a series of puzzles, each requiring a unique solution or strategy to complete. These puzzles may include logic puzzles, pattern recognition challenges, maze navigation tasks, or spatial reasoning exercises. By implementing logic to generate puzzles, validate player inputs, and track progress, programmers can create a dynamic and immersive gaming experience.

30. Pacman Game

The Pacman Game project is a classic Java application that brings to life the iconic arcade game experience. This project offers programmers an opportunity to apply their Java skills while recreating the nostalgic and beloved gameplay of Pacman.

In the Pacman Game, players control the iconic character Pacman as they navigate through a maze, eating pellets and avoiding ghosts. The objective is to clear the maze of all pellets while avoiding contact with the ghosts, which will result in losing a life. By implementing logic to handle player input, control Pacman's movement, and manage ghost behavior, programmers can recreate the thrilling and addictive gameplay of Pacman.

31. Space Invaders Game

The Space Invaders Game project is a thrilling Java application that immerses players in an epic battle against invading alien forces. This project provides programmers with an opportunity to apply their Java skills while recreating the classic arcade gaming experience of Space Invaders.

In the Space Invaders Game, players control a spaceship at the bottom of the screen, tasked with defending Earth from waves of descending alien invaders. The player can move the spaceship horizontally to dodge enemy fire and shoot projectiles to eliminate the invading aliens. By implementing logic to handle player input, manage alien movement patterns, and detect collisions, programmers can recreate the fast-paced and addictive gameplay of Space Invaders.

32. Breakout Game

The Breakout Game project is an exhilarating Java application that challenges players to smash through rows of bricks using a bouncing ball and a paddle. This project offers programmers an opportunity to apply their Java skills while recreating the timeless and addictive gameplay of Breakout.

In the Breakout Game, players control a paddle at the bottom of the screen, tasked with bouncing a ball to break through a wall of bricks at the top. The player must maneuver the paddle to keep the ball in play and prevent it from falling off the bottom of the screen. By implementing logic to handle player input, simulate ball movement and collision detection, and manage brick destruction, programmers can recreate the fast-paced and exciting gameplay of Breakout.

33. Tetris Game

The Tetris Game project is an exciting Java application that challenges players to manipulate falling tetrominoes to create complete lines and clear the playing field. This project provides programmers with an opportunity to apply their Java skills while recreating the iconic and addictive gameplay of Tetris.

In the Tetris Game, players control the descent of tetrominoes—geometric shapes composed of four square blocks— as they fall from the top of the screen to the bottom. The player can rotate and maneuver the tetrominoes to fit them into gaps and create solid lines across the playing field. By implementing logic to handle player input, simulate tetromino movement and rotation, and detect line completions, programmers can recreate the fast-paced and challenging gameplay of Tetris.

34. Minesweeper Game

The Minesweeper Game project is a captivating Java application that challenges players to uncover hidden mines on a grid-based playing field while avoiding detonating any of them. This project provides programmers with an opportunity to apply their Java skills while recreating the engaging and strategic gameplay of Minesweeper.

In the Minesweeper Game, players are presented with a grid of squares, some of which conceal hidden mines. The objective is to uncover all the non-mine squares without triggering any mines. Players can reveal the contents of a square by clicking on it, and clues provided by adjacent squares indicate the number of mines in proximity. By implementing logic to handle player input, reveal squares, and detect game-ending conditions, programmers can recreate the challenging and thought-provoking gameplay of Minesweeper.

ChatFx is a Java-based chat application that provides users with a platform to engage in real-time text-based conversations. This project offers programmers an opportunity to apply their Java skills while developing a dynamic and interactive chat system.

36. Chrome Dino Game

The Chrome Dino Game Clone project is a Java application inspired by the classic side-scrolling endless runner game found in Google Chrome's offline page. This project offers programmers an opportunity to apply their Java skills while recreating the simple yet addictive gameplay of the Chrome Dino Game.

In the Chrome Dino Game Clone, players control a dinosaur character that automatically runs forward on a desert landscape. The objective is to jump over obstacles such as cacti and birds while avoiding collisions. By implementing logic to handle player input for jumping, detect collisions with obstacles, and generate random obstacle patterns, programmers can recreate the fast-paced and challenging gameplay of the Chrome Dino Game.

37. Web Scraping

Web scraping refers to the process of extracting data from websites. It's a valuable technique for gathering information from the web for various purposes, such as data analysis, market research, or content aggregation. In Java, developers can leverage libraries like Jsoup to perform web scraping efficiently and effectively.

Jsoup is a Java library that provides a convenient API for working with HTML documents. With Jsoup, developers can easily parse HTML, navigate the document structure, and extract relevant data using CSS selectors or DOM traversal methods.

38. Text Editor

A Text Editor is a fundamental tool used for creating, editing, and managing text-based documents. Building a Text Editor application in Java provides an excellent opportunity for programmers to apply their skills while creating a versatile and user-friendly tool for text manipulation.

In Java, developers can leverage libraries like JavaFX to create graphical user interfaces (GUIs) for their applications. JavaFX offers a rich set of features for building interactive and visually appealing desktop applications, making it well-suited for developing a Text Editor.

39. Tender Management System

A Tender Management System is a comprehensive software solution designed to streamline the process of tendering, from initial announcement to final contract award. This system facilitates the entire tender lifecycle, including tender creation, submission, evaluation, and contract management. Building a Tender Management System in Java presents an opportunity for developers to create a powerful tool that enhances efficiency and transparency in the tendering process.

40. Hotel Reservation System

A Hotel Reservation System is a software application designed to streamline the process of booking accommodations and managing reservations for hotels, resorts, or other lodging establishments. Building a Hotel Reservation System in Java provides developers with an opportunity to create a comprehensive solution that enhances the efficiency and customer experience of hotel management.

41. Train Ticket Reservation System

A Train Ticket Reservation System is a software application designed to facilitate the booking of train tickets and management of reservations for railway passengers. Building a Train Ticket Reservation System in Java provides developers with an opportunity to create a comprehensive solution that enhances the efficiency and convenience of train travel.

42. School Management System

A School Management System is a comprehensive software solution designed to streamline various administrative tasks within educational institutions. This system helps manage student information, class schedules, attendance records, grading, and communication between teachers, students, and parents. Building a School Management System in Java provides an efficient way to organize and automate processes, ultimately enhancing the effectiveness of school administration.

43. Banking System

A Banking System is a software application used by financial institutions to manage customer accounts, transactions, and other banking operations. This system facilitates activities such as account management, fund transfers, loan processing, and online banking services. Building a Banking System in Java involves implementing secure and efficient algorithms for managing financial transactions, ensuring data integrity and confidentiality, and providing a seamless user experience for customers.

44. Restaurant Management System

A Restaurant Management System is a software platform used by restaurants and food service establishments to manage various aspects of their operations, including order management, inventory control, table reservations, and billing. This system helps streamline restaurant workflows, improve efficiency, and enhance the dining experience for customers. Building a Restaurant Management System in Java involves designing user-friendly interfaces, integrating with point-of-sale devices, and implementing features such as menu customization, order tracking, and kitchen management.

45. Library Management System

A Library Management System is a software application used by libraries to manage their collections, circulation, and patron services. This system helps librarians track books, manage borrower information, automate check-in and check-out processes, and generate reports on library usage. Building a Library Management System in Java involves designing a database schema to store book and patron information, implementing search and retrieval functionalities, and providing a user-friendly interface for library staff and patrons to interact with the system.

46. Mail Sender

A Mail Sender is a software application used to compose, send, and manage emails. This tool facilitates communication by allowing users to send messages to one or more recipients over email. Building a Mail Sender in Java involves integrating with email protocols such as SMTP (Simple Mail Transfer Protocol) or using third-party email APIs to handle email delivery and management.

47. 2048 Game

The 2048 Game is a popular single-player puzzle game where players slide numbered tiles on a grid to combine them and create a tile with the number 2048. Building a 2048 Game in Java involves implementing game mechanics such as tile movement, tile merging, scoring, and game over conditions. Developers can use graphical libraries like JavaFX or Swing to create a user interface for the game.

48. Table Generator

A Table Generator is a tool used to create tables or grids with specified dimensions and content. This tool is often used in document preparation, web development, or data analysis to generate structured data displays. Building a Table Generator in Java involves designing a user interface for users to input table parameters such as rows, columns, and content, and then generating the table output dynamically.

49. Health Care Management System

A Health Care Management System is a software application used by healthcare providers to manage patient records, appointments, medical history, and other administrative tasks. This system helps streamline healthcare workflows, improve patient care, and enhance operational efficiency. Building a Health Care Management System in Java involves integrating with healthcare standards such as HL7 (Health Level Seven) for data exchange and implementing features such as patient registration, appointment scheduling, and electronic health record (EHR) management.

50. Energy Saving System

An Energy Saving System is a software application used to monitor, analyze, and optimize energy usage in buildings, facilities, or industrial processes. This system helps identify energy inefficiencies, track energy consumption patterns, and implement strategies to reduce energy consumption and costs. Building an Energy Saving System in Java involves integrating with sensors, meters, and building management systems to collect energy data, performing data analysis to identify energy-saving opportunities, and implementing control algorithms to optimize energy usage in real-time.

Engaging in Java projects with source code is an invaluable aspect of learning and mastering the language. Whether you're a novice aiming to solidify your foundation or an experienced developer seeking to enhance your skills, embarking on practical projects offers a rewarding learning experience. By exploring projects across different levels of complexity, developers can broaden their understanding, tackle challenges, and unleash their creativity in the world of Java programming.

Q1. Where can I find Java projects with source code for beginners?

Beginners can find Java projects on platforms like GitHub, CodeProject, and tutorial websites catering specifically to novice programmers.

Q2. How do Java projects help in learning programming?

Java projects provide hands-on experience, reinforce theoretical concepts, and promote problem-solving skills crucial for mastering programming.

Q3. Are Java projects suitable for advanced developers?

Yes, advanced developers can benefit from Java projects by tackling complex problems, exploring new technologies, and contributing to open-source projects.

Q4. Can I modify existing Java projects to suit my requirements?

Absolutely! Modifying existing Java projects allows developers to customize functionality, experiment with different approaches, and enhance their coding skills.

Q5. Are there online communities for discussing Java projects and seeking help?

Yes, numerous online forums and programming communities exist where developers can share ideas, seek assistance, and collaborate on Java projects.

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10 Best Java Projects for Beginners 2024 [With Source Code]

If I could go back in time to help my younger self learn Java, I'd tell him to build more Java projects!

That's exactly why I wrote this article: to share 10 Java projects to help beginners like you.

Whether you’re looking to start a career in Java development or enhance your portfolio, these Java projects are perfect for leveling up your Java skills.

I’ve also personally designed the first three Java projects to be step-by-step tutorials so you can follow along with me to get hands-on and code some cool stuff.

You can think of these tutorial projects as taking a free Java course while growing your Java portfolio!

I'm also regularly adding new Java projects with step-by-step tutorials, so make sure you bookmark this page and check back for the latest Java projects to grow your skills.

Without further ado, let’s dive in and start building with Java!

• 10 Best Java Projects for Beginners in 2024

1. Java Chat Application

What is this Java project?

In this Java project, you'll build a chat application, a dynamic and engaging tool that facilitates real-time communication between users

I've also designed this project to be a step-by-step tutorial so you can follow along with me to build something very cool and very practical.

This project also goes beyond merely creating a functional application; it serves as an excellent example of utilizing Java's networking capabilities and Swing framework to create interactive and responsive desktop applications.

It's a perfect addition to your portfolio, particularly if you're looking to demonstrate your proficiency in Java development, as it showcases essential programming concepts within a context that is both interactive and practically valuable.

So get ready and fire up your favorite Java IDE , and let's get building!

Java Skills Covered:

• Networking Logic: Develop the core logic for establishing client-server connections, including handling multiple client connections simultaneously.
• Dynamic UI Updates: Utilize the Swing framework to dynamically update the chat interface, reflecting messages and user actions in real-time, thus enhancing the overall user experience.
• Event Handling: Manage action and window events to capture user inputs such as sending a message or exiting the chat.
• User Interface Design: Apply principles of Swing GUI design to create a clean, user-friendly interface for the chat application, demonstrating skills in creating appealing desktop applications.
• Multithreading: Implement multithreading to handle concurrent tasks, such as listening for incoming messages while allowing the user to type new messages.
• Best Practices in Java: Write clean, efficient, and well-structured Java code, adhering to best practices for readability, maintainability, and performance.

Build This Java Project Here

2. Java Chess Game

In this project, you will create a fully interactive chess game, a classic strategy game that brings to life the timeless battle between two opposing forces on a checkered board.

I've also designed this Java project to be a step-by-step tutorial so you can follow along with me to build something fun, challenging, and very impressive!

This project also goes beyond creating a basic application; it's about mastering the intricacies of Java's Swing framework to create a visually appealing and user-interactive gaming experience.

It's also a perfect addition to your portfolio, particularly if you want to demonstrate your ability to handle complex logic and state management, problem-solving skills, and an understanding of GUI development.

So, warm up those coding fingers, and let’s get started with this exciting project!

• Game Logic Implementation: Craft the fundamental logic for chess, including piece movements, capturing mechanics, and game-ending conditions like checkmate.
• Graphical User Interface (GUI) Design: Utilize the Swing framework to design and implement a user-friendly and visually appealing interface for the chess game.
• Event-Driven Programming: Manage user interactions through event listeners, enabling players to move pieces, respond to game states, and interact with the game dynamically.
• Advanced State Management: Develop sophisticated game state management to handle the various states of a chess game, including tracking turns, game status, and special moves.
• Problem-Solving: Demonstrate advanced problem-solving abilities in implementing chess rules, strategizing piece movements, and validating legal moves.
• Best Practices in Java: Write clean, efficient, and well-structured Java code, following best practices for software design, maintainability, and GUI development.

3. Java Email Client

In this Java project, you're going to build an email client application, allowing users to interact with their emails through a desktop interface.

This is another Java project that I've designed to be a step-by-step tutorial, so you can follow along with me to build something practical, challenging, and quite cool! I'll also guide you on how to setup your email client to connect with Gmail.

This tutorial is not just about coding; it's about applying Java's powerful capabilities in networking and the Swing framework to craft applications that are both interactive and efficient.

So, stretch out those digits and get started with this exciting project!

• Email Protocols: Learn to use JavaMail API for handling SMTP and IMAP protocols, enabling the sending and receiving of emails.
• Dynamic UI Updates: Utilize the Swing framework to dynamically update the email client interface, reflecting changes in real-time and improving the user experience.
• Event Handling: Implement action listeners to capture user interactions like composing emails, adding attachments, and authenticating users.
• User Interface Design: Employ Swing GUI design to develop a clean, intuitive interface for the email client, showcasing your ability to craft appealing and functional desktop applications.
• Session Management: Handle email session management efficiently, ensuring secure and persistent connections to email servers.
• Best Practices in Java: Write clean, effective, and well-organized Java code, adhering to best practices for code readability, maintainability, and application performance.

4. Brick Breaker Game

This brick breaker game is one of many fun Java projects that has you trying to break bricks at the top of the screen. The player controls a tiny ball placed on a small platform at the bottom of the screen, which can be moved around from left to right using the arrow keys. The goal is to break the bricks without missing the ball with your platform. The project makes use of Java swing and OOPS concepts , among other things.

Source Code

5. Data Visualization Software

Data Visualization has become important as it displays data visually using statistical graphics and scientific visualization, to the point where data visualization software has been created. This project displays the node connectivity in networking in data visualization form. This node connectivity can be located at different locations via mouse or trackpad. 

6. ATM Interface

This somewhat complex Java project consists of five different classes and is a console-based application. When the system starts the user is prompted with a user id and user pin. After entering the details successfully, the ATM functionalities are unlocked. 

7. Web Server Management System

This web server management system project deals with the information, maintenance, and information management of the web server. It covers several concepts, including tracing the physical location of an entity, and identifying URL authorities and names.

8. Airline Reservation System

The project is a web-based one featuring open architecture that keeps up with the dynamic needs of the airline business by the addition of new systems & functionality. The project includes online transactions, fares, inventory, and e-ticket operations.

The software consists of four key modules, i.e., user registration, login, reservation, and cancellation. The app allows communication through a TCP/IP network protocol thereby facilitating the usage of internet & intranet communication globally.

9. Online Book Store

This project is mainly developed for bookstores and shops to digitize the book-purchasing process. The aim is to create an efficient and reliable online bookselling platform. It also records sold and stock books automatically in the database.

10. Snake Game in Java

If you are a ’90s kid or an adult you have probably played this game on your phone. The goal of this game is to make the snake eat the tokens without the snake being touched to the boundary on the screen. Every time the snake eats the token the score is updated. The player loses when the snake touches the boundary and the final score is displayed.

• How To Setup Your Java Environment

Before you start coding in Java, it's essential to have your coding environment properly set up and ready for action.

Being a compiled language that runs on a wide range of devices through the Java Virtual Machine (JVM), Java requires a bit more setup compared to interpreted languages like JavaScript that run directly in web browsers.

Here's how to set up a Java development environment on most operating systems.

Install a Java Development Kit (JDK)

First and foremost, you need the JDK, which includes the Java Runtime Environment (JRE) and the compilers and tools needed to compile and run Java applications.

• Download the JDK: Visit AdoptOpenJDK or Oracle's official Java site to download the JDK. I recommend choosing the LTS (Long-Term Support) version for stability.
• Install the JDK: Run the installer and follow the instructions. Make sure to set the JAVA_HOME environment variable to the JDK installation path and add the JDK's bin directory to your system's PATH . This is crucial for making Java commands accessible from your command line or terminal.

Verify Installation

After setting up, verify that everything is working correctly.

To begin, open a terminal or command prompt and run these commands to check the installed Java and Java compiler versions, respectively:

Then, try creating a simple Java program and compile it using:

Then run it with:

This should confirm your JDK is correctly set up.

Install a Java IDE or Code Editor

You'll need an IDE or code editor that supports Java syntax highlighting and potentially IntelliSense for code completion.

Eclipse, NetBeans, and IntelliJ IDEA are some of the most popular choices and three of my personal favorites.

That said, I'd also consider Visual Studio Code (VSCode) as this is a hugely popular choice among developers for various languages thanks to its extensive and lightweight feature set and vast library of extensions.

If you do go the VSCode route, head to the VSCode extension marketplace and install the ‘Extension Pack for Java’ from Microsoft, and you’ll be good to go.

Install Git [Optional but Recommended]

If you're really new to coding, you might want to skip this step, but even then, I'd really recommend becoming familiar with Git as soon as you can.

If you want the TL-DR, Git is a version control system that lets you track changes in your code and collaborate with others.

While this step is not strictly necessary for Java development, it's a best practice, especially for larger projects or when working in a team.

Simply download Git from the official Git website , and during installation, you can accept most default settings. That said, you might want to choose your preferred text editor and ensure that Git is added to your system's PATH.

• Wrapping Up

And there we have it! If you've taken the time to build these 10 Java projects, you should be feeling much more competent and confident with Java.

You'll also have a burgeoning Java portfolio that's packed full of interesting and practical Java projects, each demonstrating your dedication and abilities.

I also hope you enjoyed following along with my step-by-step tutorial on the first three Java projects!

My motivation with these Java tutorials is to guide you through the nuances of Java development while also giving you hands-on experience that you'd usually only get when taking a Java course.

Here at hackr.io , we're huge fans of project-based learning, so I hope these Java projects have bolstered your confidence and sparked a deeper interest in web development or any other form of Java development.

Remember, the journey doesn't end here!

With new projects and step-by-step tutorials regularly added to this page, be sure to check back often for new opportunities to refine your Java skills and expand your portfolio.

Happy coding!

Want to sharpen up your Java development skills in 2024? Check out:

Udemy's Top Rated Course: Java 17 Masterclass: Start Coding in 2024

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Java Programming Case Study Examples

• in Talent Insight

If you are an HR professional looking for talented Java programmers, then you are in the right place. This article will provide you with some great case study examples that showcase the skills and expertise of top Java programmers.

Importance of Case Studies for HR Professionals

Case studies are an essential tool for HR professionals when hiring top talent. They provide a deeper understanding of a candidate’s skills, knowledge, and experience, which is not always possible through resumes or interviews. By reviewing case studies, HR professionals can evaluate a candidate’s ability to solve complex problems and develop innovative solutions.

Here are some excellent case study examples that demonstrate the skills and expertise of top Java programmers:

• Google Maps : Google Maps is one of the most popular navigation applications in the world. It is built using Java and provides real-time traffic updates, street views, and satellite imagery. Google Maps is an excellent example of how Java programming can be used to develop complex and innovative solutions.
• Amazon : Amazon is the world’s largest online retailer, and its website is built using Java. The website handles millions of transactions every day, and its success is a testament to the reliability and scalability of Java programming.
• Netflix : Netflix is a streaming platform that delivers movies and TV shows to millions of users worldwide. It uses Java programming to create personalized recommendations, manage user profiles, and optimize streaming quality.

Why Choose Algobash?

At Algobash, we specialize in connecting HR professionals with top Java programmers. Our platform features a comprehensive database of talented programmers who have been rigorously tested and vetted. By using Algobash, you can save time and money while finding the perfect candidate for your organization.

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13.5: Case Study- Designing a Basic GUI

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• Ralph Morelli & Ralph Wade
• Trinity College

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What elements make up a basic user interface? If you think about all of the various interfaces you’ve encountered—and don’t just limit yourself to computers—they all have the following elements:

Some way to provide help/guidance to the user.

Some way to allow input of information.

Some way to allow output of information.

Some way to control the interaction between the user and the device.

Think about the interface on a beverage machine. Printed text on the machine will tell you what choices you have, where to put your money, and what to do if something goes wrong. The coin slot is used to input money. There’s often some kind of display to tell you how much money you’ve inserted. And there’s usually a bunch of buttons and levers that let you control the interaction with the machine.

These same kinds of elements make up the basic computer interface. Designing a Graphical User Interface is primarily a process of choosing components that can effectively perform the tasks of input, output, control, and guidance.

In the programs we designed in the earlier chapters, we used two different kinds of interfaces. In the command-line interface, we used printed prompts to inform the user, typed commands for data entry and user control, and printed output to report results. Our GUI interfaces used JLabel s to guide and prompt the user, JTextField s and JTextArea s as basic input and output devices, and either JButton s or JTextField s for user control.

Let’s begin by building a basic GUI in the form of a Java application. To keep the example as close as possible to the GUIs we’ve already used, we will build it out of the following Swing components: JLabel , JTextField , JTextArea , and JButton .

The Metric Converter Application

Suppose the coach of the cross-country team asks you to write a Java application that can be used to convert miles to kilometers. The program should let the user input a distance in miles, and the program should report the equivalent distance in kilometers.

Before we design the interface for this, let’s first define a MetricConverter class that can be used to perform the conversions (Fig. 13.9). For now at least, this class’s only task will be to convert miles to kilometers, for which it will use the formula that 1 kilometer equals 0.62 miles:

Note that the method takes a double as input and returns a double . Also, by declaring the method static , we make it a class method, so it can be invoked simply by

Choosing the Components

Let’s now design a GUI to handle the interaction with the user. First, let’s choose Swing components for each of the four interface tasks of input, output, control, and guidance. For each component, it might be useful to refer back to Figure [fig-swing2-guis] to note its location in the Swing hierarchy.

A JLabel is a display area for a short string of text, an image, or both. Its AWT counterpart, the Label , cannot display images. A does not react to input. Therefore, it is used primarily to display a graphic or small amounts of static text. It is perfectly suited to serve as a prompt, which is what we will use it for in this interface.

A JTextField is a component that allows the user to edit a single line of text. It is identical to its AWT counterpart, the TextField . By using its getText() and setText() methods, a JTextField can be used for either input or output, or both. For this problem, we’ll use it to perform the interface’s input task.

A JTextArea is a multiline text area that can be used for either input or output. It is almost identical to the AWT TextArea component. One difference, however, is that a JTextArea does not contain scrollbars by default. For this program, we’ll use the JTextArea for displaying the results of conversions. Because it is used solely for output in this program, we’ll make it uneditable to prevent the user from typing in it.

Let’s use a JButton as our main control for this interface. By implementing the ActionListener interface we will handle the user’s action events.

Choosing the Top-Level Window

The next issue we must decide is what kind of top-level window to use for this interface. For applet interfaces, the top-level component would be a JApplet . For Java applications, you would typically use a JFrame as the top-level window. Both of these classes are subclasses of Container , so they are suitable for holding the components that make up the interface (Fig. [fig-swing1-guis] ).

Also, as noted earlier, JApplet s and JFrame s are both examples of heavyweight components, so they both have windows associated with them. To display a JFrame we just have to give it a size and make it visible. Because a frame runs as a stand-alone window, not within a browser context, it should also be able to exit the application when the user closes the frame.

Designing a Layout

The next step in designing the interface is deciding how to arrange the components so that they will be visually appealing and comprehensible, as well as easy to use.

Figure [fig-metricgui] shows a design for the layout. The largest component is the output text area, which occupies the center of the JFrame . The prompt, input text field, and control button are arranged in a row above the text area. This is a simple and straightforward layout.

Figure [fig-metricgui] also provides a containment hierarchy , also called a widget hierarchy , which shows the containment relationships among the various components. Although it might not seem so for this simple layout, the containment hierarchy plays an important role in showing how the various components are grouped in the interface. For this design, we have a relatively simple hierarchy, with only one level of containment. All of the components are contained directly in the JFrame .

Figure 13.11 shows the design of the Converter class, which extends the JFrame class and implements the ActionListener interface. As a JFrame subclass, a Converter can contain GUI components. As an implementor of the ActionListener interface, it also will be able to handle action events through the actionPerformed() method.

Figure [fig-converterclass] gives the implementation of the Converter class. Note the three packages that are imported. The first contains definitions of the Swing classes, and the other two contain definitions of AWT events and layout managers that are used in the program.

We have to do all initializing tasks in the constructor. First, we have to set the JFrame ’s layout to FlowLayout . A layout manager is the object that is responsible for sizing and arranging the components in a container so that the elements are organized in the best possible manner. A flow layout is the simplest arrangement: The components are arranged left to right in the window, wrapping around to the next “row” if necessary.

Second, note the statements used to set the layout and to add components directly to the JFrame . Instead of adding components directly to the JFrame , we must add them to its content pane:

A content pane is a JPanel that serves as the working area of the JFrame . It contains all of the frame’s components. Java will raise an exception if you attempt to add a component directly to a JFrame .

The JFrame and all the other top-level Swing windows have an internal structure made up of several distinct objects that can be manipulated by the program. Because of this structure, GUI elements can be organized into different layers within the window to create many types of sophisticated layouts. Also, one layer of the structure makes it possible to associate a menu with the frame.

Finally, note how the Converter frame is instantiated, made visible, and eventually exited in the application’s main() method:

It is necessary to set both the size and visibility of the frame, since these are not set by default. Because we are using a FlowLayout , it is especially important to give the frame an appropriate size. Failure to do so can cause the components to be arranged in a confusing way and might even cause some components to not appear in the window. These are limitations we will fix when we learn how to use some of the other layout managers.

Inner Classes and Adapter Classes

In this section we introduce two new language features, inner classes and adapter classes , which are used in the main() method shown above to handle the closing of the Converter application’s window when the program is exited:

This code segment provides a listener that listens for window closing events. When such an event occurs, it exits the application by calling System.exit() .

The syntax used here is an example of an anonymous inner class . An inner class is a class defined within another class. The syntax is somewhat ugly, because it places the class definition right where a reference to a window listener object would go. In effect what the code is doing is defining a subclass of WindowAdapter and creating an instance of it to serve as a listener for window closing events.

Anonymous inner classes provide a useful way of creating classes and objects on the fly to handle just this kind of listener task. The syntax used actually enables us to write one expression that both defines a class and creates an instance of it to listen for window closing events. The new subclass has local scope limited here to the main() method. It is anonymous, meaning we aren’t even giving it a name, so you can’t create other instances of it in the program. Note that the body of the class definition is placed right after the new keyword, which takes the place of the argument to the addWindowListener() method. For more details on the inner and anonymous classes, see Appendix F.

An adapter class is a wrapper class that implements trivial versions of the abstract methods that make up a particular interface. (Remember from Chapter 4 that a wrapper class contains methods for converting primitive data into objects and for converting data from one type to another.)

The WindowAdapter class implements the methods of the WindowListener interface. When you implement an interface, such as ActionListener , you must implement all the abstract methods defined in the interface. For ActionListener there’s just one method, the actionPerformed() method, so we can implement it as part of our applet or frame class. However, we want to use only one of the seven methods available in the WindowListener interface, the windowClosing() method, which is the method implemented in the anonymous inner class:

The WindowAdapter is defined simply as

Note that each method is given a trivial implementation (). To create a subclass of WindowAdapter , you must override at least one of its trivially implemented methods.

Another way to manage the application’s window closing event is to define a subclass of WindowAdapter :

Given this class, we can then place the following statement in Converter ’s main() method:

This is somewhat more familiar looking than the inner class construct. If you prefer this way of handling things, you can use this method in place of the inner classes here and in other examples.

GUI Design Critique

Figure 13.13 shows the converter interface. Although our basic GUI design satisfies the demands of input, output, control, and guidance, it has a few significant design flaws.

First, it forces the user to manually clear the input field after each conversion. Unless it is important that the user’s input value remain displayed until another value is entered, this is just an inconvenience to the user. In this case, the user’s input value is displayed along with the result in the JTextArea , so there’s no reason not to clear the input text field:

A second problem with our design is that it forces the user to switch between the keyboard (for input) and the mouse (for control). Experienced users will find this annoying. An easy way to fix this problem is to make both the JTextField and the JButton serve as controls. That way, to get the program to do the conversion, the user can just press the Enter key after typing a number into the text field.

To give the interface this type of control, we only need to add an ActionListener to the JTextField during the initialization step:

A JTextField generates an ActionEvent whenever the Enter key is pressed. We don’t even need to modify the actionPerformed() method, since both controls will generate the same action event. This will allow users who prefer the keyboard to use just the keyboard.

Given that the user can now interact with the interface with just the keyboard, a question arises over whether we should keep the button at all. In this case, it seems justifiable to keep both the button and the text field controls. Some users dislike typing and prefer to use the mouse. Also, having two independent sets of controls is a desirable form of redundancy. You see it frequently in menu-based systems that allow menu items to be selected either by mouse or by special control keys.

Another deficiency in the converter interface is that it doesn’t round off its result, leading sometimes to numbers with 20 or so digits. Develop Java code to fix this problem.

Give an example of desirable redundancy in automobile design.

Extending the Basic GUI: Button Array

Suppose the coach likes our program but complains that some of the folks in the office are terrible typists and would prefer not to have to use the keyboard at all. Is there some way we could modify the interface to accommodate these users?

This gets back to the point we were just making about incorporating redundancy into the interface. One way to satisfy this requirement would be to implement a numeric keypad for input, similar to a calculator keypad. Regular JButton s can be used as the keypad’s keys. As a user clicks keypad buttons, their face values—0 through 9—are inserted into the text field. The keypad will also need a button to clear the text field and one to serve as a decimal point.

This new feature will add 12 new JButton components to our interface. Instead of inserting them into the JFrame individually, it will be better to organize them into a separate panel and to insert the entire panel into the frame as a single unit. This will help reduce the complexity of the display, especially if the keypad buttons can be grouped together visually. Instead of having to deal with 16 separate components, the user will see the keypad as a single unit with a unified function. This is an example of the abstraction principle, similar to the way we break long strings of numbers (1-888-889-1999) into subgroups to make them easier to remember.

Figure [fig-metricgui2] shows the revised converter interface design. The containment hierarchy shows that the 12 keypad JButton s are contained within a JPanel . In the frame’s layout, the entire panel is inserted just after the text area.

Incorporating the keypad into the interface requires several changes in the program’s design. Because the keypad has such a clearly defined role, let’s make it into a separate object by defining a KeyPad class (Fig. 13.15). The KeyPad will be a subclass of JPanel and will handle its own ActionEvent s. As we saw in Chapter 4, a JPanel is a generic container. It is a subclass of Container via the JComponent class (Fig. [fig-swing2-guis] ). Its main purpose is to contain and organize components that appear together on an interface.

In this case, we will use a JPanel to hold the keypad buttons. As you might recall from Chapter 4, to add elements to a JPanel , you use the add() method, which is inherited from Container . (A JApplet is also a subclass of Container via the Panel class.)

As a subclass of JPanel , the KeyPad will take care of holding and organizing the JButton s in the visual display. We also need some way to organize and manage the 12 keypad buttons within the program’s memory. Clearly, this is a good job for an array. Actually, two arrays would be even better, one for the buttons and one for their labels:

The label array stores the strings that we will use as the buttons’ labels. The main advantage of the array is that we can use a loop to instantiate the buttons:

This code should be placed in the KeyPad() constructor. It begins by instantiating the array itself. It then uses a for loop, bounded by the size of the array, to instantiate each individual button and insert it into the array. Note how the loop variable here, k , plays a dual role. It serves as the index into both the button array ( buttons ) and the array of strings that serves as the buttons’ labels ( labels ). In that way the labels are assigned to the appropriate buttons. Note also how each button is assigned an ActionListener and added to the panel:

An important design issue for our KeyPad object concerns how it will interact with the Converter that contains it. When the user clicks a keypad button, the key’s label has to be displayed in the Converter ’s text area. But because the text area is private to the converter, the KeyPad does not have direct access to it. To address this problem, we will use a Java interface to implement a . In this design, whenever a KeyPad button is pressed, the KeyPad object calls a method in the Converter that displays the key’s label in the text area.

Figure [fig-p493f1] provides a summary of the callback design. Note that the association between the Converter and the KeyPad is bi-directional. This means that each object has a reference to the other and can invoke the other’s public methods. This will be effected by having the Converter pass a reference to itself when it constructs the KeyPad :

Another important design issue is that the KeyPad needs to know the name of the callback method and the Converter needs to have an implementation of that method. This is a perfect job for an abstract interface:

The KeyPad can interact with any class that implements the KeyPadClient interface. Note that the KeyPad has a reference to the , which it will use to invoke the keypressCallback() method.

The implementation of KeyPad is shown in Figure 13.17. Note that its constructor takes a reference to a KeyPadClient and saves it in an instance variable. Its actionPerformed() method then passes the key’s label to the KeyPadClient ’s callback method.

Given the KeyPad design, we need to revise our design of the Converter class (Fig. [fig-p493f1] ). The Converter will now implement the KeyPadClient interface, which means it must provide an implementation of the keypressCallback() method:

Recall that whenever the KeyPad object calls the keypressCallback() method, it passes the label of the button that was pressed. The Converter object simply appends the key’s label to the input text field, just as if the user typed the key in the text field.

The complete implementation of this revised version of the interface is shown in Figure 13.18 on the next page. The appearance of the interface itself is shown in Figure 3.19.

Figure 3.19 shows that despite our efforts to group the keypad into a rectangular array, it doesn’t appear as a single entity in the interface itself, which indicates a layout problem. The default layout for our KeyPad (which is a JPanel ) is FlowLayout , which is not appropriate for a numeric keypad that needs to be arranged into a two-dimensional grid pattern, which is the kind of layout our design called for (Fig. [fig-metricgui2] ).

Fortunately, this flaw can easily be fixed by using an appropriate layout manager from the AWT. In the next version of the program, we employ the java.awt.GridLayout , which is perfectly suited for a two-dimensional keypad layout (Section 13.7.2).

The lesson to be learned from this example is that screen layout is an important element of an effective GUI. If not done well, it can undermine the GUI’s effort to guide the user toward the appointed tasks. If done poorly enough, it can even keep the user from doing the task at all.

Top 15 Java Projects With Source Code [2023]

Introduction, why these projects, java projects for beginners, 1. password generator using java, 2. online survey system, 3. online resume builder, 4. snake game using java, intermediate java projects with source code, 5. data visualization software, 6. electricity billing system, 7. web medical management system, 8. supply chain management system, 9. exam seating arrangement system in java, 10. wordcount tools in java, core java projects with source code, 11. create a consumer relationship management system, 12. bfit cognitive and memory testing game, 13. network packet sniffer analyzer software, 14. internet service provider automation system, 15. create a criminal face detection system, 1. what kind of projects is java used for, 2. where can i get java projects, 3. is java worth learning in 2023, additional resources.

“Our world, moved by Java”, Take a moment to contemplate this phrase. Java is one of the most commonly used programming languages. It is also used as the server-side language for most of the back-end development tasks, like those concerning Android development and Big Data. Java is also used for desktop computing, other mobile computing, games, and numerical computing. The popularity of Java is further evidenced by 90 per cent of all Fortune 500 companies using Java. In this article, we’ll be looking at 15+ exciting Java project ideas/topics for you to explore and practice.

Any layman can be a good developer, no matter if you possess a certain gene code to accomplish this or not. That being said, putting in the effort and harbouring the correct mindset is inevitable to accomplish this. Creating Java projects will assist you to hone your skills on real-life projects and amplify your spirit as a developer. This is the sole way to know if you own a pragmatic grasp of the theory you’ve learned. Functioning on these Java projects will let you equip yourself for a job.

The theoretical knowledge that you have is not of utmost importance, employers are interested in how you are able to translate the knowledge in a practical setup. You should create a portfolio of the tasks you have accomplished so far. So, when you interview for the role of developer, you will have solutions, code, apps, and projects, to exhibit to the recruiters. The portfolio will emphasize your strong points and recognize flaws that need modification.

Confused about your next job?

Reasons why software companies choose Java for developing enterprise applications:

• The software industry adopted Java as it made development a pleasure, resolved problems with distribution, and lessened the pang of continuously porting across platforms.
• As Java is an object-oriented language, it is huge and secure. Java programs are composed independently of the platform in bytecode language, which lets the same program work on any machine that is equipped with JVM. It is a realistic and practical approach to software design. Java objects envelop data and behaviour so that code can be used again, thereby making the process of testing and troubleshooting easier.
• Java’s popularity grew when people learned how Java could solve their hardships on servers – making productivity, execution, and scalability reach new levels.
• Java has demonstrated its supremacy over other languages from server-side scaling of multi-tier architecture to internet distribution of software, to the cloud-native deployments, to taking benefit of continuously upgrading hardware architectures and a whole lot more.

Here’s a list of ideas for beginners to try with Java

With the growing trend of hacking attacks, everyone should create different and complex passwords for their diverse accounts to keep them secure. Remembering every password is not humanly possible and noting it down somewhere is not a wise idea. Hence, people take the help of Password generators to create strong and complex passwords for their accounts. To generate such functionality all by yourself, you can take advantage of the function that java offers. Whenever a user is developing an account on a new website, you can use that program to develop a password. To take the safety of the password a notch above, you can enforce such functionality so that it saves passwords in encrypted form. To incorporate this, you need to study the fundamentals of Cryptography and Java Cryptography Architecture.

The idea of this project is to create a core java project that can accumulate the viewpoint of a targeted audience of a survey through the Internet. Based on that, the app can send the targeted audiences promotional emails and can launch online surveys. Any business can make use of this type of software to assemble feedback regarding the services or products they offer. We can build such functionality so that only registered customers can cast their responses. The main attributes of the app should be:

• The apps are programmed in a way that they should be compatible with various databases like SQL and NoSQL.
• Customers can submit their reactions anonymously.
• Should be installed at a doable cost.

People find it challenging to build their resumes. The concept of this java project is to make this process smooth for the customer. The project streamlines the job of designing a resume for an individual.

We can choose a few industry-accepted, well-crafted resume templates, and request the user to incorporate the details he/she wants to add to the resume. After imputing all the necessary information, a personalized resume can be rendered in pdf and doc format by selecting a single button. The app should own the following features:

• Engaging resume template.
• Update each piece of information as per the user’s needs.
• It should have the functionality to publish the resume instantly.

In our childhood, nearly all of us enjoyed playing classic snake games. Now we will try to enhance it with the help of Java concepts. The concept appears to be easy but it is not that effortless to implement.

One ought to comprehend the OOPs concept in detail to execute this effectively. Furthermore, ideas from Java Swing are used to create this application. The application should comprise the following functionalities:

• The Snake will have the ability to move in all four directions.
• The snake’s length grows as it eats food.
• When the snake crosses itself or strikes the perimeter of the box, the game is marked over.
• Food is always given at different positions.

Data visualization is a key part of the state-of-the-art business led by Data Science, Business Analytics, and Business Intelligence. It indicates the visual depiction of data in a pictorial arrangement. This is a powerful java project for apprentices. This information representation project is tied in with providing a synopsis of the plan and usage guidelines in information perception. The destinations of this task are to give clear and compelling correspondence of the experiences wrapped up in the information via appropriate graphical or pictorial depictions.

It depicts the hub availability in systems administration as information visualization. You can use a mouse or a trackpad to find it in different areas. The most useful part about the task is that you can enhance and modify the product highlights and capacities as demonstrated by your prerequisites.

This java project is a contemporary take on the classic electricity billing system where a person gathers data from our electricity meter. The primary objective of this project is to automate the entire process to make it seamless, convenient, and effective. The software can compute the bill amount on the basis of units of electricity consumed in a month. Electricity Billing System is considered one of the best java project ideas for beginners. The app should have the below-mentioned features:

• Accurately calculate the bill amount.
• Instantaneous sharing of data between local electricity offices and users.
• Extremely safe to negate the chances of tampering.

The undertaking is called a “Virtual Medicine Home.” By using this application, patients can reserve online meetings with their preferred specialists. Specialists can recommend medical services, e-remedy, and consider the patient’s clinical records, lab reports, and many more. The app also lets users explore and interface with individuals who are donating their organs or blood. During the times of the pandemic, when it gets dangerous to visit the hospital, this JAVA project comes to your rescue. The application comes with two modules — an Admin and a Doctor module. The Admin module is responsible for the online programming framework, and the Doctor module allows specialists to communicate with patients.

This venture implies smoothening the inventory network cycle by religiously keeping the sellers and customers in check and always following the items via the different focuses in the inventory network. By using this application, the clients can directly pass on their item prerequisites to the maker, who at that moment reaches various merchants to obtain the basic assets for making the item. Per the items given to them, the vendors as a rule make a rundown of things, post which the maker selects the materials that best serve the particulars provided by the client. The selected rundown of items is sent to the stock division for handling, and then the assembling starts. When the creation is completed, the records office establishes the crude materials’ expenses and the expense of gathering to generate the full bill. Lastly, the item with the receipt is sent to the customer.

This easy java project strives at building an automated seating arrangement of students for exams, on the basis of different inputs.

There are primarily two entities, the admin and the student. Both entities can log in and register to the system, and check and access the system as per the approval granted to them. The admin can see all the relevant details of the students and provide input to the system taking into consideration the need like the branch, semester, year, and subject of the student. Admin will input details like the total number of students, available classes with the number of seats, etc. After gathering all this information the system will generate a seating arrangement based on the row number and the students’ roll number.

This is another Java Project that is very helpful for engineering students to improve their learning in the File and String Handling concepts of Java. The programmer develops an interface on which customers can document their content and then obtain the total words in the content. The programmer strategies and saves the content in a file for the purpose of processing and then processes the content by String class to calculate the words. There are different choices that the programmer creates to make the project more creative and intriguing. You can also employ the Java APIs of formatting to format the content delivered by the client.

This evolved Java project needs refined mastery in Java database connectivity, MySQL, HTTP, and JSpring framework. You ought to learn Spring core/MVC, ORM framework, and Hibernate to accomplish this project. You will develop a management system for the web platform that will let community managers revise and access consumer data for more satisfactory consumer relations. This project utilizes the Spring framework and offers the source sets for Java programming.

If you wish to be an Android developer, incorporating Java Android development application projects into your resume is highly advantageous. This project is an online brain exercise game, which experiments with your memory and cognitive skills. To create this application, you will put up the user interface, implement game logic, make a splash screen, build a game guide, and arrange the game screens. You will also have to develop an APK for the app’s release. The last step includes an automatic data processing scoreboard in the app that keeps a track of the player’s answers.

If you are curious about the system and network administration profession, then this project might benefit you. The objectives of this project are to develop system security rules and put up network packet sniffer analyzer software for the purpose of system monitoring. You will construct a packet sniffer that comprises elements like 24/7 monitoring, solving network problems, packet decoding, protocol analysis, and storing real-time data. It comes with modules like statistics, packet analysis, and a user interface module.

This ISP (internet service provider) project needs you to build a system that delivers automated troubleshooting, and error messages to the consumer. The project also needs you to link the communication systems between the server and the ISP. It comprises four automation modules like the user login module, hardware and software modules, the service module, and a connection module. You will have to use Java technology, and J2EE to create this system.

If you are interested in face detection applications, then this project is meant for you. This project comprises eyewitness, investigator, and admin modules and needs you to create an effective image detection system. You will input sliced image data into the system and facilitate the instantaneous viewing feature on it.

To conclude, these are a few of the most-recommended Java projects that you can use to design as per your mastery and convenience. The projects will hone your programming skills and will prepare you for the tech industry by providing beneficial exposure. There are a bunch of other project ideas that one can incorporate with the help of Java. In this article, we have shed some light on the amazing Java project ideas for students who have started their journey with java as well as experts who are well versed with such projects. If you are an amateur, start with the fundamental projects, then slowly shift towards complex projects as you obtain knowledge in Java. Working on various projects is the best way to comprehend how things operate in real life, what hurdles that cross the path while creating an application, how to deal with those challenges, etc. Selecting a project that demonstrates the talents required for the specific job you are looking for will help you stand out to your potential employer.

Ans. Java is mainly utilized as the server-side language for back-end development projects, including big data and Android development.

Ans. One can download all the major java projects in Eclipse, Myeclipse, and Netbeans IDE’s.

Ans. Yes, as the world is racing towards mobile apps and convenience, Java has become more and more necessary as a language. It’s one of the strongest languages in today’s time.

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Top python projects for beginners to advanced [with source code], top 15+ javascript projects with source code (2023).

• Java Arrays
• Java Strings
• Java Collection
• Java 8 Tutorial
• Java Multithreading
• Java Exception Handling
• Java Programs
• Java Project
• Java Collections Interview
• Java Interview Questions
• Spring Boot
• Java Programs - Java Programming Examples

Java Basic Programs

• How to Read and Print an Integer value in Java
• Ways to read input from console in Java
• Java Program to Multiply two Floating-Point Numbers
• Java Program to Swap Two Numbers
• Java Program to Add Two Binary Strings
• Java Program to Add two Complex Numbers
• Java Program to Check if a Given Integer is Odd or Even
• Java Program to Find the Largest of three Numbers
• Java Program to Find LCM of Two Numbers
• Java Program to Find GCD or HCF of Two Numbers
• Java Program to Display All Prime Numbers from 1 to N
• Java Program to Find if a Given Year is a Leap Year
• Java Program to Check Armstrong Number between Two Integers
• Java Program to Check If a Number is Neon Number or Not
• Java Program to Check Whether the Character is Vowel or Consonant
• Java Program for factorial of a number
• Java Program to Find Sum of Fibonacci Series Numbers of First N Even Indexes
• Java Program to Calculate Simple Interest
• Java Program for compound interest
• Java Program to Find the Perimeter of a Rectangle

Java Pattern Programs

• Java Program to Print Right Triangle Star Pattern
• Java Program to Print Left Triangle Star Pattern
• Java Program to Print Pyramid Number Pattern
• Java Program to Print Reverse Pyramid Star Pattern
• Java Program to Print Upper Star Triangle Pattern
• Java Program to Print Mirror Upper Star Triangle Pattern
• Java Program to Print Downward Triangle Star Pattern
• Java Program to Print Mirror Lower Star Triangle Pattern
• Java Program to Print Star Pascal’s Triangle
• Java Program to Print Diamond Shape Star Pattern
• Java Program to Print Square Star Pattern
• Java Program to Print Pyramid Star Pattern
• Java Program to Print Spiral Pattern of Numbers

Java Conversion Programs

• Java Program to Convert Binary to Octal
• Java Program to Convert Octal to Decimal
• Java Program For Decimal to Octal Conversion
• Java Program For Hexadecimal to Decimal Conversion
• Java Program For Decimal to Hexadecimal Conversion
• Java Program for Decimal to Binary Conversion
• Boolean toString() method in Java with examples
• Convert String to Double in Java
• Java Program to Convert Double to String
• Java Program to Convert String to Long
• Java Program to Convert Long to String
• Java Program For Int to Char Conversion
• Java Program to Convert Char to Int

Java Classes and Object Programs

• Classes and Objects in Java
• Abstract Class in Java
• Singleton Method Design Pattern in Java
• Interfaces in Java
• Encapsulation in Java
• Inheritance in Java
• Abstraction in Java
• Difference Between Data Hiding and Abstraction in Java
• Polymorphism in Java
• Method Overloading in Java
• Overriding in Java
• Super Keyword in Java
• 'this' reference in Java
• static Keyword in Java
• Access Modifiers in Java

Java Methods Programs

• Java main() Method - public static void main(String[] args)
• Difference between static and non-static method in Java
• HashTable forEach() method in Java with Examples
• StringBuilder toString() method in Java with Examples
• StringBuffer codePointAt() method in Java with Examples
• How compare() method works in Java
• Short equals() method in Java with Examples
• Difference Between next() and hasNext() Method in Java Collections
• What does start() function do in multithreading in Java?
• Difference between Thread.start() and Thread.run() in Java

Java Searching Programs

• Java Program for Linear Search
• Binary Search in Java
• Java Program To Recursively Linearly Search An Element In An Array

Java 1-D Array Programs

• Check if a value is present in an Array in Java
• Java Program to find largest element in an array
• Arrays.sort() in Java with examples
• Java Program to Sort the Array Elements in Descending Order
• Java Program to Sort the Elements of an Array in Ascending Order
• Remove duplicates from Sorted Array
• Java Program to Merge Two Arrays
• Java Program to Check if two Arrays are Equal or not
• Remove all occurrences of an element from Array in Java
• Java Program to Find Common Elements Between Two Arrays
• Array Copy in Java
• Java Program For Array Rotation

Java 2-D Arrays (Matrix) Programs

• Print a 2 D Array or Matrix in Java
• Java Program to Add two Matrices
• Sorting a 2D Array according to values in any given column in Java
• Java Program to Find Transpose of Matrix
• Java Program to Find the Determinant of a Matrix
• Java Program to Find the Normal and Trace of a Matrix
• Java Program to Print Boundary Elements of the Matrix
• Java Program to Rotate Matrix Elements
• Java Program to Compute the Sum of Diagonals of a Matrix
• Java Program to Interchange Elements of First and Last in a Matrix Across Rows
• Java Program to Interchange Elements of First and Last in a Matrix Across Columns

Java String Programs

• Java Program to get a character from a String
• Replace a character at a specific index in a String in Java
• Reverse a string in Java
• Java Program to Reverse a String using Stack
• Sort a String in Java (2 different ways)
• Swapping Pairs of Characters in a String in Java
• Check if a given string is Pangram in Java
• Print first letter of each word in a string using regex
• Java Program to Determine the Unicode Code Point at Given Index in String
• Remove Leading Zeros From String in Java
• Compare two Strings in Java
• Compare two strings lexicographically in Java
• Java program to print Even length words in a String
• Insert a String into another String in Java
• Split a String into a Number of Substrings in Java

Java List Programs

• Initializing a List in Java
• How to Find a Sublist in a List in Java?
• Min and Max in a List in Java
• Split a List into Two Halves in Java
• How to remove a SubList from a List in Java
• How to Remove Duplicates from ArrayList in Java
• How to sort an ArrayList in Ascending Order in Java
• Get first and last elements from ArrayList in Java
• Convert a List of String to a comma separated String in Java
• How to Add Element at First and Last Position of LinkedList in Java?
• Find common elements in two ArrayLists in Java
• Remove repeated elements from ArrayList in Java

Java Date and Time Programs

• Java Program to Format Time in AM-PM format
• Java Program to Display Dates of a Calendar Year in Different Format
• Java Program to Display Current Date and Time
• Java Program to Display Time in Different Country Format
• How to Convert Local Time to GMT in Java?

Java File Programs

• Java Program to Create a New File
• Java Program to Create a Temporary File
• Java Program to Rename a File
• Java Program to Make a File Read-Only
• Comparing Path of Two Files in Java
• Different Ways to Copy Content From One File to Another File in Java
• Java Program to Print all the Strings that Match a Given Pattern from a File
• Java Program to Append a String in an Existing File
• Java Program to Read Content From One File and Write it into Another File
• Java Program to Read and Print All Files From a Zip File

Java Directory Programs

• Java Program to Traverse in a Directory
• Java Program to Get the Size of a Directory
• Java Program to Delete a directory
• Java Program to Create Directories Recursively
• Java Program to Search for a File in a Directory
• Java Program to Find Current Working Directory
• Java Program to List all Files in a Directory and Nested Sub-Directories

Java Exceptions and Errors Programs

• Exceptions in Java
• Types of Errors in Java with Examples
• Java Program to Handle the Exception Hierarchies
• Java Program to Handle the Exception Methods
• Java Program to Handle Checked Exception
• Java Program to Handle Unchecked Exception
• Java Program to Handle Divide By Zero and Multiple Exceptions
• Unreachable Code Error in Java
• Thread Interference and Memory Consistency Errors in Java

Java Collections Programs

• Collections in Java
• How to Print a Collection in Java?
• Java Program to Compare Elements in a Collection
• Java Program to Get the Size of Collection and Verify that Collection is Empty
• Collections.shuffle() Method in Java with Examples
• Collections.reverse() Method in Java with Examples
• Java Program to Change a Collection to an Array
• Convert an Array into Collection in Java
• How to Replace a Element in Java ArrayList?
• Java Program to Rotate Elements of the List
• How to iterate any Map in Java

Java Multithreading Programs

• Thread isAlive() Method in Java With Examples
• How to Temporarily Stop a Thread in Java?
• Joining Threads in Java
• Daemon Thread in Java

Java More Java Programs

• Program to Print Fibonacci Series in Java
• How to convert LinkedList to Array in Java?
• Program to Convert a Vector to List in Java
• Convert a String to a List of Characters in Java
• Convert an Iterator to a List in Java
• Program to Convert List to Map in Java
• Program to Convert List to Stream in Java
• Convert List to Set in Java
• Java Program to Convert InputStream to String
• Convert Set of String to Array of String in Java
• Java Program to Convert String to Object
• How to Convert a String value to Byte value in Java with Examples

Java Programs – Java Programming Examples

Java is one of the most popular programming languages today because of its simplicity. Java programming concepts such as control statements, Arrays, Strings, Object-Oriented Programming (OOP) , etc. are very important from an interview perspective as well as from exams. 

So, whether you are a fresher preparing for job interviews or a beginner who has covered Java Fundamentals and wants to practice Java concepts then, this J ava Programming Examples page covers a wide range of Java programs in an organized manner.

In this article, we will learn and prepare for Interviews using Java Programming Examples . From basic Java programs like the Fibonacci series , Prime numbers , Factorial numbers , and Palindrome numbers to advanced Java programs.

So, keep scrolling or bookmark this page to learn about Java (Basic to Advanced) using Java Programming Examples.

Table of Content

This section, “Java Basic Programs,” provides a launchpad if you are new to Java programming. Here, you’ll encounter a collection of fundamental Java programs, that is crafted to introduce you to the core syntax, data structures, and control flow mechanisms of Java development.

• Java Program to Read The Number From Standard Input
• Java Program to Get Input from the User
• Java Program to Multiply Two Floating-Point Numbers
• Java Program to Add Two Complex Numbers
• Java Program to Check Even or Odd Integers
• Java Program to Find Largest Among 3 Numbers
• Java Program to Find LCM of 2 numbers
• Java Program to Find GCD or HCF of 2 numbers
• Java Program to Check Leap Year
• Java Program to Check whether the input number is a Neon Number
• Java Program to Check whether input character is vowel or consonant
• Java Program to Find Factorial of a number
• Java Program to Find Even Sum of Fibonacci Series Till number N
• Java Program to Calculate Compound Interest

In this section, you will get a list of Java programming language that deals with patterns. By meticulously arranging stars, numbers, or characters, you’ll not only solidify your grasp of Java loops and control structures but also discover the aesthetic side of programming.

• Java Program to Print Star Pascal’s Triangle
• Java Program to Print Diamond Star Pattern

Java Conversion Programs put your coding skills to the test. Here, you’ll encounter a series of exercises designed to strengthen your ability to transform data, like converting Binary to Decimal and more.

• Java Program For Binary to Octal Conversion
• Java Program For Octal to Decimal Conversion
• Java Program For Decimal to Binary Conversion
• Java Program For Binary to Decimal Conversion
• Java Program For Boolean to String Conversion
• Java Program For String to Double Conversion
• Java Program For Double to String Conversion
• Java Program For String to Long Conversion
• Java Program For Long to String Conversion
• Java Program For Char to Int Conversion

Here in this section, you will dive into the world of classes, acting as blueprints for objects, and objects themselves, the real-life entities.

• Java Program to Create a Class and Object
• Java Program to Create Abstract Class
• Java Program to Create Singleton Class
• Java Program to Create an Interface
• Java Program to Show Encapsulation in Class
• Java Program to Show Inheritance in Class
• Java Program to Show Abstraction in Class
• Java Program to Show Data Hiding in Class
• Java Program to Show Polymorphism in Class
• Java Program to Show Overloading of Methods in Class
• Java Program to Show Overriding of Methods in Classes
• Java Program to Show Use of Super Keyword in Class
• Java Program to Show Use of This Keyword in Class
• Java Program to Show Usage of Static keyword in Class
• Java Program to Show Usage of Access Modifier

This section unlocks the secrets of methods, the building blocks of reusability in object-oriented programming. Here, you’ll embark on a hands-on journey, crafting and wielding methods like a programming pro.

• Java Program to Show Usage of Main() method
• Java Program to Show Use of Static and Non-static Methods
• Java Program to Show Usage of forEach() Method
• Java Program to Show Usage of toString() Method
• Java Program to Show Usage of codePointAt() Method
• Java Program to Show Usage of compare() Method
• Java Program to Show Usage of equals() Method
• Java Program to Show Usage of hasNext() and next() Method
• start() Method
• run() Method

Looking for the Java Search related programs, hence here in this section we have listed down multiple searching Java programming examples.

• Java Program For Linear Search
• Java Program For Binary Search
• Java Program to Recursively Linearly Search an Element in an Array

This section is all about organizing things in your Java code. Here, you’ll learn how to create these “cabinets,” put things in them, and take them out whenever you need them.

• Java Program to Search an Element in an Array
• Java Program to Find the Largest Element in an Array
• Java Program to Sort an Array
• Java Program to Sort the Elements of an Array in Descending Order
• Java Program to Remove Duplicate Elements From an Array
• Java Program to Check if Two Arrays Are Equal or Not
• Java Program to Remove All Occurrences of an Element in an Array
• Java Program to Find Common Array Elements
• Java Program to Copy All the Elements of One Array to Another Array

This section dives into two-dimensional arrays, which are like spreadsheets for your code. Imagine organizing data in rows and columns, perfect for things like tables or images.

• Java Program to Print a 2D Array
• Java Program to Add Two Matrices
• Java Program to Sort the 2D Array Across Columns
• Java Program to Check Whether Two Matrices Are Equal or Not
• Java Program to Find the Transpose
• Java Program to Find the Determinant
• Java Program to Find the Normal and Trace
• Java Program to Print Boundary Elements of a Matrix

In this section, you will dive deep into working with text in Java. You’ll learn to manipulate, analyze, and modify strings, the fundamental building blocks of text data, with the help of multiple Java String programs.

• Java Program to Get a Character From the Given String
• Java Program to Replace a Character at a Specific Index
• Java Program to Reverse a String
• Java Program to Reverse a String Using Stacks
• Java Program to Sort a String
• Java Program to Swapping Pair of Characters
• Java Program to Check Whether the Given String is Pangram
• Java Program to Print first letter of each word using regex
• Java Program to Determine the Unicode Code Point at a given index
• Java Program to Remove leading zeros
• Java Program to Compare two strings
• Java Program to Compare two strings lexicographically
• Java Program to Print even length words
• Java Program to Insert a string into another string
• Java Program to Splitting into a number of sub-strings

Dive into the world of Java Lists, a fundamental data structure in Java. Here, you’ll learn how to store, access, and manipulate elements in a specific sequence.

• Java Program to Initializing a List
• Java Program to Find a Sublist in a List
• Java Program to Get Minimum and Maximum From a List
• Java Program to Split a list into Two Halves
• Java Program to Remove a Sublist from a List
• Java Program to Remove Duplicates from an Array List
• Java Program to Remove Null from a List container
• Java Program to Sort Array List in an Ascending Order
• Java Program to Get First and Last Elements from an Array List
• Java Program to Convert a List of String to Comma Separated String
• Java Program to Add Element at First and Last Position of a Linked list
• Java Program to Find Common Elements in Two ArrayList
• Java Program to Remove Repeated Element From An ArrayList

This section gives you to handle the ever-changing world of dates and times within your Java programs. Explore the working with calendars, timestamps, and time manipulation – essential skills for building applications that deal with deadlines, scheduling, or even historical data analysis.

• Java Program to Format time in AM-PM format
• Java Program to Display Dates of Calendar Year in Different Format
• Java Program to Display current date and time
• Java Program to Display time in different country’s format
• Java Program to Convert the local Time to GMT

Java File Programs empowers you to interact with files in Java. This section dives deep into reading, writing, and manipulating data stored outside your program.

• Java Program to Create a new file
• Java Program to Create a temporary file
• Java Program to Write into a file
• Java Program to Rename a file in java
• Java Program to Compare Paths of Two files
• Java Program to Copy one file into another file
• Java Program to Print all the Pattern that Matches Given Pattern From a File
• Java Program to Read content from one file and writing it into another file
• Java Program to Read and printing all files from a zip file

This section navigate you to the world of directories and files in Java. Through this Java programming examples “Java Directory” section you’ll master creating, manipulating, and interacting with directories.

• Java Program to Traverse in a directory
• Java Program to Get the size of a directory
• Java Program to Delete a Directory
• Java Program to Create directories recursively
• Java Program to Search for a file in a directory
• Java Program to Find the current working directory
• Java Program to Display all the directories in a directory

Through a series of hands-on exercises on Java Exceptions and Errors Handling programs, you will easily get to know how to become a good Java programmer.

• Java Program to Show Runtime Exceptions
• Java Program to Show Types of Errors
• Java program to Handle the Checked exceptions
• Java Program to Handle the Unchecked Exceptions
• Java Program to Show Unreachable Code Error
• Java Program to Show Thread interface and memory consistency errors

Java Collections is not just about storing your data in Java; So practicing Java Collections programs will help you boost your organization skills. Get deep down into lists, sets, maps, and more, and discover how to structure your data effectively to build robust and efficient Java applications.

• Java Program to Use Different Types of Collection
• Java Program to Print a Collection
• Java Program to Get the Size of the Collection
• Java Program to Shuffle the Elements of a Collection
• Java Program to Reverse a Collection
• Java Program to Convert Collection into Array
• Java Program to Convert Array into Collection
• Java Program to Replace Elements in a List
• Java Program to Rotate Elements of a List
• Java Program to Iterate through Elements of HashMap

In this section you will get hand on Java Multithreading programs. It will help you to conquer the art of threading, a technique that lets your program handle multiple tasks seemingly at once.

• Java Program to Check the Thread Status
• Java Program to Suspend a thread
• Java Program to Join Threads
• Java Program to Show Daemon Thread

This section extends your coding experience with a diverse array of programs that explore more intricate functionalities. Brace yourself to tackle problems that involve algorithms, data manipulation, and object-oriented programming concepts.

• Java Program to Print Fibonacci Series in Different Ways
• Java Program to Convert Linked List to an Array
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Java Case Study

• First Online: 02 October 2022

Cite this chapter

• Quentin Charatan 5 &
• Aaron Kans 6  

Part of the book series: Texts in Computer Science ((TCS))

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You have now covered many aspects of the Java language. In this chapter we are going to take stock of what you have learnt by developing a Java application that draws upon all these topics. We will implement interfaces; we will catch and throw exceptions; we will make use of the collection classes in the java . util package; and we will store objects to file. We will also make use of many JavaFX components to develop an attractive graphical interface.

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If you are developing a class from scratch that you wish to add into a package, your Java IDE can be used so that the package line is inserted into your code for you and the required directory structure is created. If you are using your Java IDE to revisit classes previously written outside of a package (as in this example), you may need to ensure that the resulting directory structure is reflected in the project you are working in. Refer to your IDE’s documentation for details about how to do this.

By default, the tabs you add will appear at the top left of the TabPane (as in Fig.  24.8 ). A setSide method can be used to choose an alternative side (the top right, the bottom, the left or the right).

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Charatan, Q., Kans, A. (2022). Java Case Study. In: Programming in Two Semesters. Texts in Computer Science. Springer, Cham. https://doi.org/10.1007/978-3-031-01326-3_24

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Chapter 53 Duke’s Forest Case Study Example

Duke’s Forest is a simple e-commerce application that contains two web applications and illustrates the use of multiple Java EE 6 APIs:

JavaServer Faces technology, including Ajax

Contexts and Dependency Injection for the Java EE Platform (CDI)

Java API for XML Web Services (JAX-WS)

Java API for RESTful Web Services (JAX-RS)

Java Persistence API (JPA)

Java API for JavaBeans Validation (Bean Validation)

Enterprise JavaBeans (EJB) technology

The application consists of the following projects:

Duke’s Store: A web application that has a product catalog, customer self-registration, and a shopping cart. It also has an administration interface for product, category, and user management. The project name is dukes-store .

Duke’s Shipment: A web application that provides an interface for order shipment management. The project name is dukes-shipment .

Duke’s Payment: A web service application that has a JAX-WS service for order payment. The project name is dukes-payment .

Duke’s Resources: A simple Java archive project that contains all resources used by the web projects. It includes messages, CSS style sheets, images, JavaScript files, and JavaServer Faces composite components. The project name is dukes-resources .

Entities: A simple Java archive project that contains all JPA entities. This project is shared among other projects that use the entities. The project name is entities .

Events: A simple Java archive project that contains a POJO class that is used as a CDI event. The project name is events .

The following topics are addressed here:

Design and Architecture of Duke's Forest

Building and Deploying the Duke's Forest Case Study Application

Running the Duke's Forest Application

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Inheritance is one of the key features of OOP that allows us to create a new class from an existing class.

The new class that is created is known as subclass (child or derived class) and the existing class from where the child class is derived is known as superclass (parent or base class).

The extends keyword is used to perform inheritance in Java. For example,

In the above example, the Dog class is created by inheriting the methods and fields from the Animal class.

Here, Dog is the subclass and Animal is the superclass.

Example 1: Java Inheritance

In the above example, we have derived a subclass Dog from superclass Animal . Notice the statements,

Here, labrador is an object of Dog . However, name and eat() are the members of the Animal class.

Since Dog inherits the field and method from Animal , we are able to access the field and method using the object of the Dog .

• is-a relationship

In Java, inheritance is an is-a relationship. That is, we use inheritance only if there exists an is-a relationship between two classes. For example,

• Car is a Vehicle
• Orange is a Fruit
• Surgeon is a Doctor
• Dog is an Animal

Here, Car can inherit from Vehicle , Orange can inherit from Fruit , and so on.

Method Overriding in Java Inheritance

In Example 1 , we see the object of the subclass can access the method of the superclass.

However, if the same method is present in both the superclass and subclass, what will happen?

In this case, the method in the subclass overrides the method in the superclass. This concept is known as method overriding in Java.

Example 2: Method overriding in Java Inheritance

In the above example, the eat() method is present in both the superclass Animal and the subclass Dog .

Here, we have created an object labrador of Dog .

Now when we call eat() using the object labrador , the method inside Dog is called. This is because the method inside the derived class overrides the method inside the base class.

This is called method overriding. To learn more, visit Java Method Overriding .

Note : We have used the @Override annotation to tell the compiler that we are overriding a method. However, the annotation is not mandatory. To learn more, visit Java Annotations .

super Keyword in Java Inheritance

Previously we saw that the same method in the subclass overrides the method in superclass.

In such a situation, the super keyword is used to call the method of the parent class from the method of the child class.

Example 3: super Keyword in Inheritance

In the above example, the eat() method is present in both the base class Animal and the derived class Dog . Notice the statement,

Here, the super keyword is used to call the eat() method present in the superclass.

We can also use the super keyword to call the constructor of the superclass from the constructor of the subclass. To learn more, visit Java super keyword .

protected Members in Inheritance

In Java, if a class includes protected fields and methods, then these fields and methods are accessible from the subclass of the class.

Example 4: protected Members in Inheritance

In the above example, we have created a class named Animal. The class includes a protected field: name and a method: display() .

We have inherited the Dog class inherits Animal . Notice the statement,

Here, we are able to access the protected field and method of the superclass using the labrador object of the subclass.

• Why use inheritance?
• The most important use of inheritance in Java is code reusability. The code that is present in the parent class can be directly used by the child class.
• Method overriding is also known as runtime polymorphism. Hence, we can achieve Polymorphism in Java with the help of inheritance.
• Types of inheritance

There are five types of inheritance.

1. Single Inheritance

In single inheritance, a single subclass extends from a single superclass. For example,

2. Multilevel Inheritance

In multilevel inheritance, a subclass extends from a superclass and then the same subclass acts as a superclass for another class. For example,

3. Hierarchical Inheritance

In hierarchical inheritance, multiple subclasses extend from a single superclass. For example,

4. Multiple Inheritance

In multiple inheritance, a single subclass extends from multiple superclasses. For example,

Note : Java doesn't support multiple inheritance. However, we can achieve multiple inheritance using interfaces. To learn more, visit Java implements multiple inheritance .

5. Hybrid Inheritance

Hybrid inheritance is a combination of two or more types of inheritance. For example,

Here, we have combined hierarchical and multiple inheritance to form a hybrid inheritance.

Table of Contents

• Introduction
• Example: Java Inheritance
• Method Overriding Inheritance
• super Keyword Inheritance
• protected Members and Inheritance

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Java Interfaces Explained with Examples

Interface in Java is a bit like the Class, but with a significant difference: an interface can only have method signatures, fields and default methods. Since Java 8, you can also create default methods . In the next block you can see an example of interface:

The interface above contains two fields, two methods, and a default method. Alone, it is not of much use, but they are usually used along with Classes. How? Simple, you have to make sure some class implements it.

Now, there is a ground rule : The Class must implement all of the methods in the Interface. The methods must have the exact same signature (name, parameters and exceptions) as described in the interface. The class does not need to declare the fields though, only the methods.

Instances of an Interface

Once you create a Java Class which implements any Interface, the object instance can be referenced as an instance of the Interface. This concept is similar to that of Inheritance instantiation.

An Interface can not contain a constructor methods. Therefore, you can not create an instance of an Interface itself. You must create an instance of some class implementing an Interface to reference it.

Think of interfaces as a blank contract form, or a template.

What can you do with this feature? Polymorphism! You can use only interfaces to refer to object instances!

But how about multiple interfaces?

Yes, you can implement multiple Interfaces in a single class. While in Inheritance within Classes you were restricted to inherit only one class, here you can extend any number of interfaces. But do not forget to implement all of the methods of all the Interfaces, otherwise compilation will fail!

Some features of Interfaces

• You can place variables within an Interface, although it won’t be a sensible decision as Classes are not bound to have the same variable. In short, avoid placing variables!
• All variables and methods in an Interface are public, even if you leave out the public keyword.
• An Interface cannot specify the implementation of a particular method. Its up to the Classes to do it. Although there has been a recent exception (see below).
• If a Class implements multiple Interfaces, then there is a remote chance of method signature overlap. Since Java does not allow multiple methods of the exact same signature, this can lead to problems. See this question for more info.

Interface Default Methods

Before Java 8, we had no way to direct an Interface to have a particular method implementation. This lead to lot of confusion and code breaks if an Interface definition is suddenly changed.

Suppose, you wrote an open source library, which contains an Interface. Say, your clients, i.e. practically all developers around the world, are using it heavily and are happy. Now you have had to upgrade the library by adding a new method definition to the Interface to support a new feature. But that would break all builds since all Classes implementing that Interface have to change now. What a catastrophe!

Thankfully, Java 8 now provides us default methods for Interfaces. A default method can contain its own implementation directly within the Interface! So, if a Class does not implement a default method, the compiler will take the implementation mentioned within the Interface. Nice, isn’t it? So in your library, you may add any number of default methods in interfaces without the fear of breaking anything!

But, what happens if two interfaces have the same method signature?

Awesome question. In that case, if you do not provide the implementation in the Class, poor compiler will get confused and simply fail! You have to provide a default method implementation within the Class also. There is also a nifty way using super to call which implementation you like:

Static Methods in Interfaces

Also new to Java 8 is the ability to add static methods to interfaces. Static methods in interfaces are almost identical to static methods in concrete classes. The only big difference is that static methods are not inherited in the classes that implement the interface. This means that the interface is referenced when calling the static method not the class that implements it.

Inheriting an Interface

It is also possible in Java for an Interface to inherit another Interface, by using, you guessed it, extends keyword:

That means, the Class implementing MusicPlayer Interface has to implement all methods of MusicPlayer as well as Player :

So now you have a good grasp of Java interfaces! Go learn about Abstract Classes to see how Java gives you yet another way to define contracts.

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