Java is one of the most popular and versatile programming languages, known for its reliability, security, and platform independence. Developed by James Gosling in 1982, Java is widely used across industries like big data, mobile development, finance, and e-commerce.
Building Java projects is an excellent way to enhance your skills and gain practical experience. Projects allow you to apply theoretical knowledge, boost your confidence, and build a strong portfolio to impress recruiters. Whether you’re a college student or an aspiring developer, working on projects can set you apart in interviews.
In this article, we’ll explore a range of Java project ideas, from beginner to advanced levels, perfect for college assignments or skill-building. Let’s dive in and start creating!
Beginner Level Java Project Ideas
The below-given list consists of some beginner-level Java project ideas that can be used as major projects by the students or professionals.
1. Currency Converter
This project is a very basic project in Java that is used to convert a currency from one to another. A web-based interface for converting currency and getting the output value, for example, here displays converting the currency of the US dollar to INR.
Abstract: We see variations with different countries using different currencies. Be aware of the current exchange prices in the market and then can convert from one currency to another. A calculator-like application, developed using Ajax, Applet, and web features of Java servlets. You also get a regular update when there’s a change in the value of the country’s currency and also the conversion rate.
People use this application basically for business, shares, and finance-related areas where currency exchange and money transfer happen daily. You get a preferred choice to convert any country’s currency. Just enter the amount, the currency to which you want to transform to, click enter and you get the output.
Technologies Required: Java programming language, Java Servlets Web Features, Applet, and Ajax.
2. Brick Breaker Game
One of the pleasant ways to study technology is through implementing game applications. It may not be easy but developing this Java project will make you learn a lot of new things. This game development project will provide you with java experience and essential animation techniques with their integration.
Abstract: Many of you already heard of the brick breaker game. It has a small ball that knocks the bricks taking the help of a small platform at the base. The player handles this platform and tries to bounce the ball through that platform. In this project, the scoring depends on the number of bricked-broken, i.e., the more you destroy the bricks, the more you score.
If you missed the chance for the ball to bounce, then the game is over. This project is basically for beginners who are looking for a minor project. This simple project will surely help you with your first-year project or also as an implementation for fun purposes.
Technologies Required: Java, Game development, JFrame, JPanel, and Java Graphics Kit.
3. Attendance Management System
An attendance management system is one of the major projects for university-level graduates. The project can be built using Java, the MVC architecture could be followed, and Maven as a built tool. It uses MySQL as a backend for database management and uses a tomcat server to deploy the application in order to see it working live.
Abstract: This project is a web application that manages the attendance of any student in school or college, also employees in an organization. It has an admin feature that holds the access to do any kind of changes like update, delete, and add user records to the list.
Various users of the application where users can access are:
Technologies Required: Java Servlet , MVC architecture, Maven MySQL , Tomcat Server JSP, HTML , CSS , and JavaScript .
4. Number Guessing Game
This number guessing game is an easy project built on Java where the player has to guess a number given in between a range. If the guessed number is right, the player wins else, loses. It also has the concept of limited attempts where the player has to guess the number within the limited attempts given.
Abstract: The UI has an input value option where the player has to enter the guessed value, it also displays the time remaining to guess. After completing the limits given, if the guessed number is right, the player wins else loses. The range between the number can be from 1 to 100 or 1 to 1000. Also, if the number you’ve guessed is high or low to the actual value, the application sends you an alert “Too High” or “Too Low”. After the limited attempt is completed, the actual value is revealed.
Technologies Required: Java Programming Language and Random Class in Java .
5. Tic-Tac-Toe Game
The Tic-Tac-Toe game application is a simple project developed using GUI (Graphical User Interface) in Java. It is very easy to understand and play, players generally prefer this kind of game when they’re bored and want something to play which is quick and easy.
Abstract: The game starts with two players as active members, having a one-print board on the screen which displays 9 boxes (i.e., 3×3). The first person who starts the game has to enter either X or O for any one box, followed by the other player entering the other X or O (opposite to what the first player has entered). this continues unless any one of them gets a line cut either diagonally or straight. And the person who founds the line is the winner of the game.
Technologies Required: Java, Java Swing, Java GUI (Graphical User Interface), and JFrame.
6. Simple Banking Application
Simple Banking Application is a simple Java project for beginners to start their career in coding. You’ll learn about Scanner class to take inputs, and the basics of strings, loops, methods, and conditional statements. Here, simple banking operations like deposit, withdrawal, checking balance, exit, etc.
Abstract: In this modernized world, where time is money, everyone has got the habit of doing their tasks online. Within a click, a task is done. You get this application to make transactions just by sitting in your comfort zone. Every operation like money transfer and balance inquiry can be done in seconds.
Technologies Required: Java Programming Language, Oracle Database (if needed), and Java methods.
7. Library Management System
Learning Management System, this project build on Java is a great way to update the record, monitor and add books, search for the required ones, taking care of the issue date and return date. It comes with basic features like creating a new record and updating and deleting it.
Abstract: We rely on web-based applications for every task, be it small or big. This contains two sections – the admin and users section. The admin handles the record of the users and the user handles the entry of books being issued to him/her. Also, there can be modules that display the data of books available in the library, a search button to search for the required book, and the final payment method for the charges of the book or fine imposed.
Technologies Required: Java, Java Swing Library, MySQL JDBC Connector, MySQL Community Server, and rs2xml.jar (used to display the data in a table format).
8. Word Counter
A simple project for beginners is good to start. It can be built using Swing in Java. Here, the application tells you the no of words, the entered paragraph has.
Abstract: This Java application is best suited for counting words. Remember, our childhood days when we were asked to write an essay on a given topic where the word length should be 500 or 1000. This application comes with a feature that could help you. Along with word count, it also tells you the number of characters, words, and paragraphs it has. Also, it is completely free to use and there’s no word count limit.
Technologies Required: Java, Java Swing, Java Framework (JFrame), and Applet.
9. ATM Simulation System
ATM simulation system is a simple Java project for beginners. It is a kind of personal banking system where users can perform various transactions like withdrawals, deposits, and checking the balance of the account in just one click. It has a Graphical User Interface (GUI) to make the process user-friendly.
Abstract: The introduction of the application came up with two features which have an admin mode and the user mode. The admin mode is responsible for controlling the entire system like adding and deleting accounts and updating the records of the user. The user-mode takes care of the deposit, withdrawal, and checking of the account balance. The whole process of this system is automated, from PIN (Personal Identification Number) validation to the transaction. The card details will be secured enough by encrypting the details in the database and will only be accessible to the authorized user. The UI of the application contains a profile of the user, accounts added to it, and an option to withdraw, deposit and update details of the account.
Technologies Required: Java, J2EE, Apache Tomcat Web Server, and Oracle.
10. Airline Reservation System
This Java project is built to help the customers book tickets online, check the availability of seats, get the details of the flight arrival, select the class they want to choose, and departures reserve seats for national or international flights.
Abstract: This web-based Java project helps you in searching from pick-up location to destination, and filters out the flight details with timing, and available seats. It consolidates data from all airlines using globally distributed systems. After entering all the required details of the customer, it asks you to choose a flight with a preferred time slot, complete the payment, and book the ticket. It provides rates in real-time to customers as well as to travel agents. It also has two sections where you get to book a national and an international flight wherein you can book a domestic or international flight as per your choice.
Technologies Required: Core Java, HTML, JavaScript, and SQL Database.
11. Smart City Project (City Guide Project)
Smart City is a web-based application built using Java. It stores details of a city and displays information about the city such as hotels, shopping marts, restaurants, tourist places, transportation modes, and also some general info. This acts as a guide to the new visitors.
Abstract: Tourists and even general people travel from one place to another in order to explore or for employment purposes but before they explore, they want to get an insight data about the place. So, to help them with this, a simple city project can be the best guide for them. It is a web-based application written in Java which basically guides you about the place you’re going to visit. You can access all the details of the city. In this application, users need to sign up by entering input details and then can access all the required details of the city. It contains various modules like admin, tourism, business, and student wherein users can switch to the module as per the requirement.
Technologies Required: Java, JDBC ODBC 2.0 drivers, Oracle Database, J2EE, AJAX, and XML.
12. A Text-Based Adventure Game
A Text-Based Adventure game, built using Java and Data Structures is an interesting game where the player follows the commands given to him. This web-based gaming app is often referred to as interactive fiction.
Abstract: This game has a central character called the “Adventurer” which is like an object who represents the player. With the help of the object, tracking of the actual player can be made easy, also can find where the player is. The role of the adventurer is to type the commands which consist of one or two words. The commands which have to be followed can be Go, Look, Take, Drop, Use, and Exit. It contains the following classes TextAdventure, AdventureModel, Adventurer, and a number of rooms.
Technologies Required: Java programming language, Java objects and classes, and Array and Hashmaps.
13. Grading System in Java
This project built using Java is an important one to grade students based on their markings. It is the best project to start for beginners and has a GUI (Graphical User Interface) design.
Abstract: The main aim to build this project is to help schools and universities to manage the details of the students (like name, class, total subjects, marks achieved, etc) and rank them on the basis of marks. It manages the calculation of the average marks achieved and ranks the student on the basis of marks. It stores the data of students in a MySQL database. The project is built on Java and has a fully GUI (Graphical User Interface). It has all the features like managing the records of students, integrating all records of examinations, displaying all the information, and keeping a track of it.
Technologies Required: Java, Java Swing, MySQL Database, and JPanel.
14. School Management System
The School Management System is a Java application that stores records of schools be it related to students, teachers, and staff.
Abstract: This application’s objective is to help the school management system in managing the data easily. The manual system could be a complicated one when it comes to keeping the records so, there comes the role of this project. It holds personal records of students, teachers, and staff. This system contains modules for different roles be it admin, student, staff, and teacher. Here, the admin has to be responsible for maintaining the records in the database like adding users, updating the details of the user, and deleting the user’s profile.
Technologies Required: Java, MS Access database, Java Swing, Java Graphical User Interface (GUI), and JFrame.
15. Pharmacy Management System
Pharmacy Management System is a web-based application built using Java that offers you the facility to order medicines, consult doctors and keep track of all your orders online by just signing up with a registered mail id.
Abstract: This application is of great help to the users who regularly goes for body check-up because this application gives you the comfort of consulting with a doctor at your comfort place. It comes with an excellent and friendly user interface comes with an automated billing system. It has an integrated chat feature where you can consult with a doctor regarding your health and it also tells you details of medicines and you can also track the status of ordered items.
Technologies Required: Java, Java Swing, AWT, JDBC, and MySQL Database.
16. Supermarket Billing System
This web-based application is a Java project that is usually built for keeping the sales recording made on a daily basis. It uses a MySQL database for recording the data of the users, products, and orders made by the user (customer).
Abstract: The web-based Java application is implemented to keep a record of the products, status of the products orders, and user’s history. This UI is made in terms that it displays records of bills made on that particular day, items added to the new bill also have an automated system that calculates the bill with GST and other applied taxes and has a print button to print the copy statement of the bill. It has an admin module that is responsible for adding, updating, or deleting records of the bill. It maintains a database to store the items list, categories, and buyers list.
Technologies Required: Java, JDBC, MySQL Database, JSP, JavaScript, servlet, HTML and Ajax.
17. Online Quiz Management System
You must have definitely used this application during your school days when you were asked to attend an MCQ-based test. This Online Quiz Management System can be built using Java which contains different sections for questions, marks, and subjects.
Abstract: This Java-based project is online software that is a kind of an online platform for conducting mock tests and competitions. The UI is built in such a way that it displays the login button where the user has to sign in to begin the test, followed by entering the details of the test (which could be a unique key), then it displays the no of questions, time duration, and a “START” button to start the test. After completing the test, it asks you to review the answers and then submit it using the “SUBMIT” button. The admin module gives you access to the user’s profile.
Technologies Required: Java, J2EE, MySQL Database, and JDBC.
18. HelpDesk Management System
HelpDesk Management System built using Java, Servlet, and MySQL is a project made with the intention to help individuals raise a complaint regarding a ticket issued to them. It uses the MVC architecture design and Servlet can manage the request and response made.
Abstract: You face an issue, you raise a complaint, and a ticket ID is generated which can be used as a reference to resolve the issue. This application can be used in society, schools, organizations, and even in public places where people facing any kind of issues can register a complaint using the application. As soon you raise a complaint, a notification goes to the admin who verifies it and then reverts back to you after rectifying the issue. It includes features like Track, Issue, Ticket ID, Help Desk, Network, and Issues. It contains an admin and user module.
Technologies Required: Java, J2EE, HTML, JavaScript, MySQL database, Tomcat Server, JDBC, and Servlet.
19. Notes and Password Manager
This application is similar to a To-Do List app which helps you to complete your daily tasks and keep track of ongoing tasks. It also has a password for the users to log in to keep the data secure.
Abstract: This application is of great help when individuals have a lot of tasks to perform where some of them have to be done on priority. This application keeps a track of your daily tasks and helps you in completing them. This can be used by individuals and even by organizations to manage daily tasks. This saves their time as it stores their data in a centralized database for each user. The steps to follow are setting up the details, authenticating it with an authorized user, and managing notes and passwords. It comes with basic functionalities such as a login page, home page, note page, and updating details on the note page.
Technologies Required: Java, Android, XML, and Firebase.
20. Supply Chain Management System
Supply Chain Management System is a Java project for beginners where different operations such as inventory, storing, handling, and moving raw and finished goods to the final destination are completed.
Abstract: This project helps enterprises to move materials from source to destination. It is generally used by the production sector where sellers can add and update the details of the goods and the buyers can contact them regarding the booking of orders. Buyers can also check the availability of the goods and keep track of the status. It uses MS Access as a back-end, Apache Tomcat as a server, and HTML and CSS to design its front-end with Java. The main objective of this application is to avoid the communication gap between dealers and clients. There’s also a feedback feature for the goods received.
Technologies Required: Java, JDBC, JSP, HTML, and MS-Access Database
Intermediate Level Java Projects Ideas
The below-given list consists of some intermediate-level Java project ideas which can be used as major projects by the students or professionals.
21. Virtual Private Network (VPN) for an Office
Virtual Private Network (VPN) developed using Java can be your minor or major project. It works the same as WAN (Wide Area Network), and provides a private network across the public, for example, the Internet. A point-to-point virtual connection through traffic encryption, virtual tunneling protocols, or dedicated connections.
Abstract: This application built using Java provides a secure and private connection to the organizations. It can be used on office premises, as private networks and it can also be the best means to share information. This project also has three modules which are admin and marketing where the admin’s role is to handle the data stored of the members and the training module checks for the testing and networking part, and the marketing.
Technologies Required: Java, Java Servlet, J2EE, Apache Tomcat Server, HTML, and JavaScript.
22. Flappy Bird Game
Flappy bird game is a very simple Java-based gaming app in which the main character (which is the bird) has to reach the final destination after crossing all the hurdles. The use of the swing component in Java is perfect in this case.
Abstract: In this gaming application, the player has to control the movement of the bird. The fabby bird only ascends when there’s a tap by the player and descends the rest of the time. The count increase by 1 when the fabby bird passes one hurdle, also the time duration is counted. There shouldn’t be a collision with any hurdle, or else the game ends.
Technologies Required: Java, Java Swing, Java AWT, and OOPS.
23. Scientific Calculator in Java
A Scientific calculator built using Java is a general-purpose application whose primary objective is to perform basic mathematical operations and also perform some essential and tricky solutions to trigonometric functions, logarithms, etc.
Abstract: Here, Java Swing can be used to implement this project. It performs mathematical operations like addition, subtraction, multiplication, division, trigonometric operations, finding log values, etc. You get buttons to enter the input value and give the output within a second. In the program’s code, the use of switch cases can be seen to perform operations as per the case. The Scanner class can be used to take input from java.util package.
Technologies Required: Java, Java Swing, Java AWT, and OOPS.
24. Simple Search Engine
You search for anything using a search engine so building a simple search engine can be one of the best projects. Applying a ranking algorithm can give better results.
Abstract: Simple Search Engine is a Java application developed using Servlets, SQL Server, and Oracle database. It can include features like a search bar, which displays the top 30 websites related to the keyword searched. The database containing resource description is described in SOIF (Summary Object Interchange Format) format. The interaction with the search server to access the database is dependent on the Java interface provided by classes in Java SDK. Your search engine contains a history of the pages you searched for, pages visited in the past few days, accounts linked with it, etc.
Technologies Required: Java, Java Servlet, Oracle or SQL Database, JDBC, Apache Tomcat, and JSP.
25. Online Voting System
An online Voting System built using JSP and Servlet can be the best project for college students. This project is designed to automate the voting process where multiple parties are added and then with the maximum votes, a leader is chosen.
Abstract: The main objective to build this web-based application is to reduce the time at the voting booth. The UI has different sections which display a login page to enter the portal, different parties with their symbol, an option to choose among them, and then to submit the entry. It uses HTML, CSS, and bootstrap in the front-end, MySQL is the database used, and also it uses an MVC design pattern. The user has to vote for the preferred party anonymously, but the voter’s information and total votes will be stored in the database.
Technologies Required: Java, JSP, HTML, CSS, MySQL, and Tomcat Apache Server.
26. Online Book Store
Online Book Store is an application that displays lists of books available in the store where you can purchase or even return them. You can check for the value of the book and buy it by sitting in your comfort place.
Abstract: The application created using Java allows users to purchase a book by checking for the availability of the book. The user has to sign up, check for the book, enter the credit card details, complete the payment and order the book. There are two modules in this application – the admin and the user. The admin is responsible for the entry of details and the user makes orders. Also, you can see the categories of the book such as Software, History, English, Science, etc. All the CRUD operations are performed by the admin.
Technologies Required: Java, HTML, CSS, JavaScript, Java Servlet, MySQL, and Tomcat server.
27. CGPA Calculator in Java
This CGPA Calculator built using Java is a web-based application that is of great help to university students. It can be built as a major project during your college days.
Abstract: This project can be built on eclipse using Maven and uses MVC architecture. It uses MySQL to store the data. This application creates a mark sheet for students and then calculates the CGPA. Here, also the admin is held responsible for entering the details, managing the user details, etc. In the UI, you can view a search key to enter the enrollment number and you get the details displayed in seconds. All the marks for the subjects are given semester-wise. When marks of all the subjects are entered, calculated CGPA will be auto-generated.
Technologies Required: Java, HTML, CSS, JavaScript, JSP, Java Servlet, MVC, Maven, MySQL, and Tomcat server.
28. Snake Game in Java
Remember, those days when you used to play the snake game on Nokia mobile phones. This snake game can be implemented fully using Java and uses a database using MySQL. It has all the functionalities with a full-featured Graphical User Interface (GUI).
Abstract: The application was built long years back and gained a lot of popularity within a few months. The game starts with a snake whose size increases with the no of apples eaten by it and the life of the snake ends when it gets collided with a wall or any kind of hurdle which comes in the way. So, basically, the more apple snake eats, the more score you get. The navigation is like a snake can turn left or right by ninety degrees. A constructor can be used to start the movement of a snake and a function to perform various other operations.
Technologies Required: Java, MySQL Database, JDBC, Java AWT, J-Frame, and Java Swing.
29. Job Portal in Java
One thing which comes to your mind when you complete your graduation is getting a job. So, building a job portal for individuals where after entering the qualifications, the user gets the opportunity to enroll himself/herself for the job preferred.
Abstract: The main objective of the online job portal project in java is to make the right job available for the right candidate. The admin, the recruiter, and the user are the three most vital parts of this application. Here, as soon as you enter the details or qualifications pursued by you, the recruiter verifies it and takes the further procedure ahead. The process includes verifying the details, contacting the concerned person, having all the interviews done, and receiving an offer letter. The database (which can be MongoDB) stores the data of the user. The user performs CRUD operations and deletes the profile as soon as the user gets a job.
Technologies Required: Java, HTML, CSS, JavaScript, JSP, Java Servlet, MySQL Database, and Tomcat server.
30. Online Cab Booking System
Ola and Uber are the online cab booking system that almost every one of us has become used. So building such a Java application would be the best idea.
Abstract: In this project, the main objective is to help customers in booking a cab to reach their destination with pick-up as their preferred location. The application fetches your pick-up location and asks you to enter the drop location, when entered, finds a cab driver nearby and even tells you the calculated time the cab will take to drop you at the location. The system is designed using Spring MVC, Servlets, Hibernate, JDBC, JSP, HTML, and CSS.
Technologies Required: Java, HTML, CSS, JavaScript, JSP, JDBC, Java Spring, Java Servlet, MySQL, and Tomcat Server.
31. Crime Records Management System
Based on the number of crimes being committed, this crime record management system is a secured application built using Java. It allows you to keep a record of the entries made of the number of crimes being committed.
Abstract: This Java-based web application runs on a Tomcat server and uses MySQL as a database. Its main features include managing crimes, Handling FIRs, records of criminals, and complaints registered. You can develop a secured application using EJB, Spring, and Hibernate. You need MySQL database to run this project and MySQL J-Connector to make connections between MySQL and Java.
Technologies Required: Java, JSP, JDBC, MySQL, and Tomcat Server.
32. Color Hunt Gaming Project
This Java-based gaming application is a mind game consisting of differently-colored letters which are randomly arranged. It is a kind of mind game that is built with the intention to increase your thought process.
Abstract: Basically, in this game, there are different colors printed on the text, whatever statement gets displayed, you have to click on the mentioned color. As soon as you click on one, the other comes suddenly. You lose points when you don’t click on the color displayed. There’s also a time limit given in which you have to reach a given number of points. This game is built in such a way that it can only be played on android phones.
Technologies Required: Java, Android, and XML.
33. Online CV/Resume Builder
You’re ready to apply for a job but don’t have an interesting CV/which perfectly shows your skills and qualifications. Online CV/Resume Builder comes to the rescue where just by entering required details you’ll get your CV/Resume in pdf format which is auto-generated.
An online resume builder project is an internet-based application that can help students and other professionals to get an instant resume template, which they can fill easily with their credentials. An online resume builder provides different standard templates that can be downloaded in different formats like PDF and others. A user will not have to spend a lot of time on formatting and designing his or her resume. He will only enter his particulars and download his CV on the go.
Abstract: The online resume/cv builder application helps job seekers to build a CV with a proper format. It has different templates to choose from wherein you can opt for the best one. This application contains various modules which are user, skills, job, salary, and resume. Using these modules, different sections of a CV are made and after entering the details you get a properly organized CV.
Technologies Required: Java, MySQL Database, JDBC, Java Servlet, JSP, and Tomcat Server.
This application tells you the weather-related information about your location and also of other locations. This Java-based application can be the best project for your minor project submission.
Abstract: Due to the change in weather, we can predict whether it’s going to be a rainy day, sunny day, or cold day. But sometimes, all of a sudden you see climate change. With the help of a weather information system which is a Java-based project, you can get to know the temperature not only your but also worldwide. The application picks up the default location and displays the weather data report. It tells you the temperature, rain, humidity, and even the direction of the wind blowing.
Technologies Required: Java, Java Servlet, J2EE, Tomcat Server, HTML, CSS, and JavaScript.
35. Exam Seating Arrangement System
Exam Seating Arrangement System, the application implemented using JSP, Java, and MySQL. This application will help the examination handling manager to organize the allocation of seats for all the students.
Abstract: This application takes in the details of the students be it name, roll no, section, branch, or year and stores it in databases. The admin is held responsible for managing the details, here the application is made to automate the seats allocates to students and this final list goes out on the day of examination which helps in not getting the seats revealed prior. The modules existing here are the student module, admin module, and seat module. This automated system helps in maintaining the record and proper functioning of the system.
Technologies Required: Java, HTML, CSS, JSP, JavaScript, MySQL, and Tomcat Server.
36. Traffic Controller System
The Traffic Controller System is a Java JSP and MySQL-based project, which is developed for process automation of the Traffic Controller System.
Abstract: The objective of this application is to create a system that controls the traffic which is done by implementing a set of classes and interfaces. The main features can be traffic lights, routes, diversions, and traffic police. It is a secured application that runs in the JVM. A GUI is created using JavaFX and classes for performing different operations such as the structure of the traffic network, and the main view of the system. The simulation is carried out to handle input and events that are being executed.
Technologies Required: Java, HTML, CSS, JSP, JavaScript, MySQL, and Tomcat Server.
37. Disaster Management System
Disaster Management System is a Java-based application that identifies and implements techniques for reducing the causes of the disaster and the losses faced. It can be the best project to avoid natural disasters.
Abstract: Applications like this have four stages: mitigation, readiness, response, and recovery. Each process aims to reduce the risks occurred due to natural disasters like earthquakes, tsunamis, etc. The process follows when there’s a report submitted by the affected region, the data is collected and reported to the concerned authority to take measures. It is a web-based Java Swing project which stores data in MySQL for future references. The UI can have a login page, lists of earthquakes that happened, a new user page, and a user list.
Memory Game – Flipping Tiles
Technologies Required: Java, Java Swing, JSP, JDBC, MySQL, and Java Servlet.
38. I-D Card Generator System
ID Card Generator System is a web-based Java project which uses the Swing library. It generates an ID of the entered details of the individuals and gives you a copy of it.
Abstract: Application like this can be used in schools and offices where you require an ID card to enter the premises. In this project, you just need to log in and enter your personal details like name, age, blood group, designation, and the joining date, when you enter the required details, you get a copy of the ID card. The features can be storing the data in the database, having a unique identification number assigned to each individual, and no forgery allowed.
Technologies Required: Java, Java Servlet, Java Swing, JSP, HTML, CSS, JavaScript, JDBC, MySQL, and Tomcat Server.
39. Memory Game – Flipping Tiles
Memory Game is a mind game where you have to remember the position of tiles placed earlier and re-assign them within the stipulated time. This game is implemented to play with your mind and bring the best.
Abstract: This Java-based gaming application is built using Swing. This game’s intention is to test our memory, here, we see an even number of tiles in which each number has a pair. All the tiles are kept facing downwards, all the tiles have to be flipped one by one, and when two tiles get matched they are removed from the tile. When there’s no match, the tiles are kept back in position.
Technologies Required: Java, Java Swing, Java OOPS, and ArrayLists in Java.
40. Chat Application
Chat application has gained great popularity among individuals these days. This is similar to Instagram, Facebook, and Orkut.
Abstract: This online chat application using Java uses graphical components in the Swing toolkit in Java and uses MySQL as a database. Its features include signing up, signing in, chatting, sending and accepting requests, and creating groups. You can also create a free account. It also checks whether there’s any fake account and gives no access to the user.
Technologies Required: Java, Java Swing toolkit, MySQL, Java AWT, and JDBC.
Advanced Level Java Projects Ideas
The below-given list consists of some advanced-level Java project ideas which can be used as major projects by the students or professionals.
41. Social Networking Site
Social Networking Site has gained a lot of popularity among individuals. It is Java JSP and MySQL project, running on the tomcat server. The management of users, photos, and videos are taken care of by this system.
Abstract: The application has many features including a login page, a home page displaying all the posts by friends added to your account, a notification page displaying all the alerts, and a profile page where you can edit the details, and also upload a picture of yours. It uses HTTP requests to complete the operation which is being sent to the server. The process that the server follows is decoding the request, authenticating the user, and making changes to the database. JSON is used here to encode the result if found anything other than boolean.
Technologies Required: Java, Maven, J2EE, HTML, CSS, Java Servlet, JDBC, MySQL, and Tomcat Server.
42. Bug Tracking System
A system that keeps track of bugs that occurred during the development of a project. This Java-based application is created to help developers to manage bugs/errors occurring during SDLC.
Abstract: Bug Tracking System is an application that focuses majorly on tracking the bug and changing its status. When the developer gets the help of a bug tracking system, he/she gets an assistant to help him/her during SDLC. The modules present in this can be the developer, admin, and management modules. The system records all the bugs in their detail so that the developer can work on them one by one.
Technologies Required: Java, JDBC, JNDI, Servlets, JSP, Oracle/Access, RetHat JBoss AS, JavaScript, HTML, and CSS.
43. Text Editor in Java
Text Editor built using Java is similar to a notepad application. You can also create text documents and the system gives you the feature to edit the text entered in it.
Abstract: A Text Editor built using Java uses JTextArea, JMenu, JMenuItems, and JMenuBar to perform various tasks. It allows the user to enter, change, store, and print text. It also has a file menu to make changes in files (like open, save, close, and print) for future references. and an edit menu to cut, copy and paste texts. Also, it has a “Save and Submit” button to close the file after saving the data. An actionListener is also used to detect actions in the project.
Technologies Required: Java, Java Swing, Java AWT, JTextArea, JMenuBar, JMenu, and JMenuItems.
44. Digital Steganography
Security is a major concern be it in organizations, military, hospitals, schools, etc where data plays an important role. Keeping the data secure is much needed and here is a Java-based project for advanced programmers which is digital steganography.
Abstract: Digital Steganography is the process in which data is sent from one point to another without affecting other users and also keeps the data secure. It uses multimedia as a covering medium. It embeds the text or image and stores it in the least significant bits of the image. It doesn’t even create suspense for the hackers. This is the best project advanced programmers on Java can work on. It contains both sender and receiver side programs to let the user choose whether to send or receive data.
Technologies Required: Java, Java Servlet, MySQL or Oracle Database, JDBC, TomCat Server, JSP, HTML, CSS, and JavaScript.
45. Criminal Face Detection System
The Criminal Face Detection System application is built to detect the faces of criminals by matching them with the pre-existing data in the database. Although, there are so many ways to identify a criminal this could be the best way, and also building this project for advanced programmers is easy.
Abstract: The project is intended to use the images previously taken and identification will be done according to images taken of different people. This project aims to build an automated CFD system by levering the human ability to recall minute details in the facia. The criminal Face Detection System project aims to build a Criminal Face Detection system by levering the human ability to recall minute facial details. Identification of criminals at the scene of a crime can be achieved in many ways like fingerprinting, DNA matching, or eyewitness accounts. Out of these methods, eyewitness accounts are preferred because it stands scrutiny in court and it is a cost-effective method. It is possible that witnesses to a crime have seen the criminal though in most cases it may not be possible to completely see the face of the perpetrator.
Tip: We can also get this project done in Python language even better because of help of existing present libraries out there namely numpy and other tools: Keras. It will be easier to do in python language but doing via java makes one crystal clear about networking, machine mearning and java aplllciation onboard running concepts clear.
Technologies Required: TensorFlow, Core java, Machine learning, SQlite, OpenCV(eccentric tool), Strong knowledge of advanced java concepts.
46. Airline Reservation System with Advanced Features
With the increase in modernization, everything has come online. This application helps customers book flight tickets by just being at their comfort place and also searching for the availability, and timing of the flight.
Abstract: To ease and automate the registration process system provides information like passengers information and a criminal list of all passengers. The software consists of 4 modules: User registration, login, reservation, and cancelation. The project includes online transaction fares, inventory, and e-ticket operations. Do remember not to mix it with Library Management System as here we have to go to and perform something where here it is a process. Yes, it seems easy on the skills side as mentioned below which are required.
Prerequisites Required: By far we are aware of Applets, Servers, Servlets, AWT, and Core Java concepts already with Collection Framework.
Technologies Required- Core Java, Java Swing, Java AWT, Java Applet, Database-MySQL
47. Advanced Chatting Application
When everything has come online, chatting is also performed online be it your online friends or anyone. Hence, this advanced chatting application has advanced features like smooth communication with video and audio call facilities, and many more.
Abstract: There is not only one system rather we dop have multiple systems connected together. Client and Server communication takes place instead of basic request-based communication. This application will need to communicate through Sockets . The server and client can run on different computers in the same network. There can be multiple clients connected to a server and they can chat with each other. These days with every application, we are having a feature ‘Help’ to chat with a bot right from traveling apps such as Ola, and Uber to food apps such as Zomato, and Swiggy, this chatbox is embedded in every.
Sockets are something new that one has to learn here in adhering to the advancement of the project because they will be used for networking, and TCP/IP protocols so communication can be built.
Technologies Required: Core Java, Java Network-based libraries, Java Sockets, File handling, and Exception Handling.
48. Customer-Relationship Manager
It is a bit tedious but an easy pick among advanced-level java projects. It is also one of the most important projects as CRN is used by nearly all organizations, institutions,s or any software company as well to keep updated with the records. Do not confuse it with working just with awt and core java, as here we need to fetch it over a larger dataset in real-time for which we need to inculcate tools like Hibernate, MVC, CSS, JDBC, etc. Do create in a high-tech way invoking the above tools so that internal working of such tools can be perceived.
Abstract: It is the easiest of all projects at the advanced level as the name suggests that we have to build an application where we will be building relationships with customers by adding new customers in software, editing, and deleting the info whenever needed. The customer relations manager will keep track of all the customers. Adding new customers, editing their information, and deleting them when needed. Fetching already recorded customer details whenever required.
Technologies Required: Spring Framework, Hibernate, HTML, CSS, JDBC, CRUD, MVC, and DB(MySQL)
Java Project Ideas For Beginners and Advanced
49. Email System
A great medium to conversate in an official way is through e-mails. Email system implemented using Java is of great value to organizations. So, advanced programmers can focus on the implementation of this project
The project functions something like this – the ISP’s (Internet Service Provider) mail server handles the emails sent from an ISP. All the sent emails first come to the mail server, after which they are processed and forwarded to the collector’s destination where another mail server is located.
The mail server on the collector side receives the incoming emails and sorts them electronically in the inbox. Now, the recipient can use their email application to view the received emails. The entire transaction occurs by directly connecting to the mail server through the program, which makes it much safer than the existing email client software.
Abstract: This Email System is designed for sending and receiving emails for official communication which has a proper format. This system can use HTTP port 80 to access emails, also the two main protocols which can be used are SMTP (Simple Mail Transfer Protocol) and POP3. Java mail API can be used to transfer data. The ISP mail server receives all the mail sent, processes it, and then forwards it to the destined address.
It is one of good project ideas among advance level project as it is of hard nut among projects we have discussed above and it will take a lot of time to properly build it.
Technologies Required: Event Handler, HTTP, Protocols (like SMTP and POP3),
50. Advance Sudoku Game
Sudoku Game is something which almost every one of us must have played. This game is all related to logic-building so once you play this, it gets easy for you to build logic so building this application is of great use.
Abstract: Building the same common sudoku game but with help of JavaFX. Generating a new game from a solution, keeping track of user input. Checking user input against the generated solution. Keeping track of selected numbers will be necessary for some of the functions and also the ability to check for errors and give hints in which we can invoke trained models from larger datasets from machine learning and artificial intelligence.
Technologies Required: Core Java , Java FX , Event Listeners , MVC, Collection API
Must Read:
Similar Reads
Java Tutorial
Java is a high-level, object-oriented programming language used to build applications across platforms—from web and mobile apps to enterprise software. It is known for its Write Once, Run Anywhere capability, meaning code written in Java can run on any device that supports the Java Virtual Machine (
10 min read
Java Overview
Introduction to Java
Java is a class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is intended to let application developers Write Once and Run Anywhere (WORA), meaning that compiled Java code can run on all platforms that support Java without the
9 min read
The Complete History of Java Programming Language
Java is an Object-Oriented programming language developed by James Gosling in the early 1990s. The team initiated this project to develop a language for digital devices such as set-top boxes, televisions, etc. Originally, C++ was considered to be used in the project, but the idea was rejected for se
6 min read
How to Install Java on Windows, Linux and macOS?
Java is a versatile programming language widely used for building applications. To start coding in Java, you first need to install the Java Development Kit (JDK) on your system. This article provides detailed steps for installing Java on Windows 7, 8, 10, 11, Linux Ubuntu, and macOS. Download and In
5 min read
Setting up Environment Variables For Java - Complete Guide to Set JAVA_HOME
In the journey to learning the Java programming language, setting up environment variables for Java is essential because it helps the system locate the Java tools needed to run the Java programs. Now, this guide on how to setting up environment variables for Java is a one-place solution for Mac, Win
5 min read
How JVM Works - JVM Architecture
JVM(Java Virtual Machine) runs Java applications as a run-time engine. JVM is the one that calls the main method present in a Java code. JVM is a part of JRE(Java Runtime Environment). Java applications are called WORA (Write Once Run Anywhere). This means a programmer can develop Java code on one s
7 min read
JDK in Java
The Java Development Kit (JDK) is a cross-platformed software development environment that offers a collection of tools and libraries necessary for developing Java-based software applications and applets. It is a core package used in Java, along with the JVM (Java Virtual Machine) and the JRE (Java
5 min read
Differences Between JDK, JRE and JVM
Understanding the difference between JDK, JRE, and JVM plays a very important role in understanding how Java works and how each component contributes to the development and execution of Java applications. The main difference between JDK, JRE, and JVM is: JDK: Java Development Kit is a software devel
4 min read
Java Basics
Java Syntax
Java is an object-oriented programming language that is known for its simplicity, portability, and robustness. The syntax of Java programming language is very closely aligned with C and C++, which makes it easier to understand. Java Syntax refers to a set of rules that defines how Java programs are
6 min read
Java Hello World Program
Java is one of the most popular and widely used programming languages and platforms. In this article, we will learn how to write a simple Java Program. This Java Hello World article will guide you through writing, compiling, and running your first Java program. Learning Java helps to develop applica
5 min read
Java Identifiers
An identifier in Java is the name given to Variables, Classes, Methods, Packages, Interfaces, etc. These are the unique names and every Java Variables must be identified with unique names. Example: public class Test{ public static void main(String[] args) { int a = 20; }}In the above Java code, we h
2 min read
Java Keywords
In Java, Keywords are the Reserved words in a programming language that are used for some internal process or represent some predefined actions. These words are therefore not allowed to use as variable names or objects. Example : [GFGTABS] Java // Java Program to demonstrate Keywords class GFG { pub
5 min read
Java Data Types
Java is statically typed and also a strongly typed language because each type of data (such as integer, character, hexadecimal, packed decimal, and so forth) is predefined as part of the programming language and all constants or variables defined for a given program must be declared with the specifi
14 min read
Java Variables
Variables are the containers for storing the data values or you can also call it a memory location name for the data. Every variable has a: Data Type - The kind of data that it can hold. For example, int, string, float, char, etc.Variable Name - To identify the variable uniquely within the scope.Val
7 min read
Scope of Variables in Java
The scope of variables is the part of the program where the variable is accessible. Like C/C++, in Java, all identifiers are lexically (or statically) scoped, i.e. scope of a variable can be determined at compile time and independent of the function call stack. In this article, we will learn about J
6 min read
Java Operators
Java operators are special symbols that perform operations on variables or values. They can be classified into several categories based on their functionality. These operators play a crucial role in performing arithmetic, logical, relational, and bitwise operations etc. Example: Here, we are using +
14 min read
Java User Input
The most common way to take user input in Java is using Scanner class which is part of java.util package. The scanner class can read input from various sources like console, files or streams. This class was introduced in Java 5. Before that we use BufferedReader class(Introduced in Java 1.1). As a b
4 min read
Java Flow Control
Java if statement
The Java if statement is the most simple decision-making statement. It is used to decide whether a certain statement or block of statements will be executed or not i.e. if a certain condition is true then a block of statements is executed otherwise not. Example: [GFGTABS] Java // Java program to ill
5 min read
Java if-else Statement
The if-else statement in Java is a powerful decision-making tool used to control the program's flow based on conditions. It executes one block of code if a condition is true and another block if the condition is false. In this article, we will learn Java if-else statement with examples. Example: [GF
4 min read
Java if-else-if ladder with Examples
The Java if-else-if ladder is used to evaluate multiple conditions sequentially. It allows a program to check several conditions and execute the block of code associated with the first true condition. If none of the conditions are true, an optional else block can execute as a fallback. Example: The
3 min read
Java For Loop
Java for loop is a control flow statement that allows code to be executed repeatedly based on a given condition. The for loop in Java provides an efficient way to iterate over a range of values, execute code multiple times, or traverse arrays and collections. Example: [GFGTABS] Java class Geeks { pu
4 min read
For-Each Loop in Java
The for-each loop in Java (also called the enhanced for loop) was introduced in Java 5 to simplify iteration over arrays and collections. It is cleaner and more readable than the traditional for loop and is commonly used when the exact index of an element is not required. Example: Below is a basic e
6 min read
Java while Loop
Java while loop is a control flow statement used to execute the block of statements repeatedly until the given condition evaluates to false. Once the condition becomes false, the line immediately after the loop in the program is executed. Let's go through a simple example of a Java while loop: [GFGT
3 min read
Java Do While Loop
Java do-while loop is an Exit control loop. Unlike for or while loop, a do-while check for the condition after executing the statements of the loop body. Example: [GFGTABS] Java // Java program to show the use of do while loop public class GFG { public static void main(String[] args) { int c = 1; //
4 min read
Java Break Statement
The Break Statement in Java is a control flow statement used to terminate loops and switch cases. As soon as the break statement is encountered from within a loop, the loop iterations stop there, and control returns from the loop immediately to the first statement after the loop. Example: [GFGTABS]
3 min read
Java Continue Statement
In Java, the continue statement is used inside the loops such as for, while, and do-while to skip the current iteration and move directly to the next iteration of the loop. Example: [GFGTABS] Java // Java Program to illustrate the use of continue statement public class Geeks { public static void mai
4 min read
Java return Keyword
return keyword in Java is a reserved keyword which is used to exit from a method, with or without a value. The usage of the return keyword can be categorized into two cases: Methods returning a valueMethods not returning a value1. Methods Returning a ValueFor the methods that define a return type, t
4 min read
Java Methods
Java Methods
Java Methods are blocks of code that perform a specific task. A method allows us to reuse code, improving both efficiency and organization. All methods in Java must belong to a class. Methods are similar to functions and expose the behavior of objects. Example: [GFGTABS] Java // Creating a method //
8 min read
How to Call a Method in Java?
Calling a method allows to reuse code and organize our program effectively. Java Methods are the collection of statements used for performing certain tasks and for returning the result to the user. In this article, we will learn how to call different types of methods in Java with simple examples. Ex
3 min read
Static Method vs Instance Method in Java
In Java, methods are mainly divided into two parts based on how they are associated with a class, which are the static method and the Instance method. The main difference between static and instance methods is: Static method: This method belongs to the class and can be called without creating an obj
4 min read
Access Modifiers in Java
Access Modifiers in Java control the visibility and accessibility of classes, methods, and variables, ensuring better security and encapsulation. Understanding default, private, protected, and public access modifiers is essential for writing efficient and structured Java programs. In this article, w
7 min read
Command Line Arguments in Java
Java command-line argument is an argument i.e. passed at the time of running the Java program. In Java, the command line arguments passed from the console can be received in the Java program and they can be used as input. The users can pass the arguments during the execution bypassing the command-li
3 min read
Variable Arguments (Varargs) in Java
Variable Arguments (Varargs) in Java is a method that takes a variable number of arguments. Variable Arguments in Java simplify the creation of methods that need to take a variable number of arguments. Example: We will see the demonstration of using Varargs in Java to pass a variable number of argum
5 min read
Java Arrays
Arrays in Java
Arrays in Java are one of the most fundamental data structures that allow us to store multiple values of the same type in a single variable. They are useful for storing and managing collections of data. Arrays in Java are objects, which makes them work differently from arrays in C/C++ in terms of me
15+ min read
How to Initialize an Array in Java?
An array in Java is a data structure used to store multiple values of the same data type. Each element in an array has a unique index value. It makes it easy to access individual elements. In an array, we have to declare its size first because the size of the array is fixed. In an array, we can stor
6 min read
Java Multi-Dimensional Arrays
A multidimensional array can be defined as an array of arrays. Multidimensional arrays in Java are not stored in tabular form. Each row is independently heap allocated, making it possible to have arrays with different row sizes. Example: [GFGTABS] Java // Java Program to Demonstrate // Multi Dimensi
9 min read
Jagged Array in Java
In Java, Jagged array is an array of arrays such that member arrays can be of different sizes, i.e., we can create a 2-D array but with a variable number of columns in each row. Example: arr [][]= { {1,2}, {3,4,5,6},{7,8,9}}; So, here you can check that the number of columns in row1!=row2!=row3. Tha
5 min read
Arrays class in Java
The Arrays class in java.util package is a part of the Java Collection Framework. This class provides static methods to dynamically create and access Java arrays. It consists of only static methods and the methods of Object class. The methods of this class can be used by the class name itself. The c
13 min read
Final Arrays in Java
As we all know final variable declared can only be initialized once whereas the reference variable once declared final can never be reassigned as it will start referring to another object which makes usage of the final impracticable. But note here that with final we are bound not to refer to another
4 min read
Java Strings
Java Strings
In Java, String is the type of objects that can store the sequence of characters enclosed by double quotes and every character is stored in 16 bits i.e using UTF 16-bit encoding. A string acts the same as an array of characters. Java provides a robust and flexible API for handling strings, allowing
9 min read
Why Java Strings are Immutable?
In Java, strings are immutable means their values cannot be changed once they are created. This feature enhances performance, security, and thread safety. In this article, we will explain why strings are immutable in Java and how this benefits Java applications. What Does Immutable Mean?An immutable
3 min read
Java String concat() Method with Examples
The string concat() method concatenates (appends) a string to the end of another string. It returns the combined string. It is used for string concatenation in Java. It returns NullPointerException if any one of the strings is Null. In this article, we will learn how to concatenate two strings in Ja
4 min read
String class in Java
String is a sequence of characters. In Java, objects of the String class are immutable which means they cannot be changed once created. In this article, we will learn about the String class in Java. Example of String Class in Java: [GFGTABS] Java // Java Program to Create a String import java.io.*;
7 min read
StringBuffer Class in Java
StringBuffer is a class in Java that represents a mutable sequence of characters. It provides an alternative to the immutable String class, allowing you to modify the contents of a string without creating a new object every time. Features of StringBuffer ClassHere are some important features and met
12 min read
Java StringBuilder Class
In Java, the StringBuilder class is a part of the java.lang package that provides a mutable sequence of characters. Unlike String (which is immutable), StringBuilder allows in-place modifications, making it memory-efficient and faster for frequent string operations. Declaration: StringBuilder sb = n
7 min read
String vs StringBuilder vs StringBuffer in Java
A string is a sequence of characters. In Java, objects of String are immutable which means a constant and cannot be changed once created. In Java, String, StringBuilder, and StringBuffer are used for handling strings. The main difference is: String: Immutable, meaning its value cannot be changed onc
6 min read
Java OOPs Concepts
Java OOP(Object Oriented Programming) Concepts
Java Object-Oriented Programming (OOPs) is a fundamental concept in Java that every developer must understand. It allows developers to structure code using classes and objects, making it more modular, reusable, and scalable. The core idea of OOPs is to bind data and the functions that operate on it,
13 min read
Classes and Objects in Java
In Java, classes and objects are basic concepts of Object Oriented Programming (OOPs) that are used to represent real-world concepts and entities. The class represents a group of objects having similar properties and behavior, or in other words, we can say that a class is a blueprint for objects, wh
12 min read
Java Constructors
Java constructors or constructors in Java is a terminology used to construct something in our programs. A constructor in Java is a special method that is used to initialize objects when they are created. It is automatically called when an object is instantiated using the new keyword. It can be used
11 min read
Object Class in Java
Object class in Java is present in java.lang package. Every class in Java is directly or indirectly derived from the Object class. If a class does not extend any other class then it is a direct child class of the Java Object class and if it extends another class then it is indirectly derived. The Ob
8 min read
Abstraction in Java
Abstraction in Java is the process of hiding the implementation details and only showing the essential functionality or features to the user. This helps simplify the system by focusing on what an object does rather than how it does it. The unnecessary details or complexities are not displayed to the
9 min read
Encapsulation in Java
Encapsulation is one of the core concepts in Java Object-Oriented Programming (OOP). It is the process of wrapping data (variables) and methods that operate on the data into a single unit, i.e., a class. Encapsulation is used to hide the internal implementation details of a class. This technique ens
10 min read
Inheritance in Java
Java Inheritance is a fundamental concept in OOP(Object-Oriented Programming). It is the mechanism in Java by which one class is allowed to inherit the features(fields and methods) of another class. In Java, Inheritance means creating new classes based on existing ones. A class that inherits from an
14 min read
Polymorphism in Java
Polymorphism in Java is a fundamental concept in object-oriented programming (OOP) that allows objects to behave differently based on their specific class type. The word polymorphism means having many forms. In Java, polymorphism refers to the ability of a message to be displayed in more than one fo
8 min read
Method Overloading in Java
In Java, Method Overloading allows different methods to have the same name, but different signatures, where the signature can differ by the number of input parameters or the type of input parameters, or a mixture of both. Method overloading in Java is also known as Compile-time Polymorphism, Static
10 min read
Overriding in Java
Overriding in Java occurs when a subclass (child class) implements a method that is already defined in the superclass or Base Class. The overriding method must have the same name, parameters, and return type as the method in the parent class. This allows subclasses to modify inherited behavior while
15 min read
Java Packages
Packages in Java are a mechanism that encapsulates a group of classes, sub-packages, and interfaces. Packages are used for: Prevent naming conflicts by allowing classes with the same name to exist in different packages, like college.staff.cse.Employee and college.staff.ee.Employee.They make it easie
8 min read
Java Interfaces
Java Interface
An Interface in Java programming language is defined as an abstract type used to specify the behaviour of a class. An interface in Java is a blueprint of a behaviour. A Java interface contains static constants and abstract methods. Key Properties of Interface: The interface in Java is a mechanism to
13 min read
Interfaces and Inheritance in Java
A class can extend another class and can implement one and more than one Java interface. Also, this topic has a major influence on the concept of Java and Multiple Inheritance. Example: [GFGTABS] Java //Driver Code Starts{ // A class can implement multiple interfaces import java.io.*; //Driver Code
7 min read
Java Class vs Interfaces
In Java, the difference between a class and an interface is syntactically similar; both contain methods and variables, but they are different in many aspects. The main difference is, A class defines the state of behaviour of objects.An interface defines the methods that a class must implement.Class
5 min read
Java Functional Interfaces
A functional interface in Java is an interface that contains only one abstract method. Functional interfaces can have multiple default or static methods, but only one abstract method. Runnable, ActionListener, and Comparator are common examples of Java functional interfaces. From Java 8 onwards, lam
7 min read
Nested Interface in Java
We can declare interfaces as members of a class or another interface. Such an interface is called a member interface or nested interface. Interfaces declared outside any class can have only public and default (package-private) access specifiers. In Java, nested interfaces (interfaces declared inside
5 min read
Marker Interface in Java
Marker Interface in Java is an empty interface means having no field or methods. Examples of marker interface are Serializable, Cloneable and Remote interface. All these interfaces are empty interfaces. Example: [GFGTABS] Java //Driver Code Starts{ interface Serializable { // Marker Interface } //Dr
4 min read
Java Comparator Interface
Comparator interface in Java is used to order the objects of user-defined classes. A comparator object is capable of comparing two objects of the same class. Following function compare obj1 with obj2. Syntax: public int compare(Object obj1, Object obj2): Suppose we have an Array/ArrayList of our own
6 min read
Java Collections
Collections in Java
Any group of individual objects that are represented as a single unit is known as a Java Collection of Objects. In Java, a separate framework named the "Collection Framework" has been defined in JDK 1.2 which holds all the Java Collection Classes and Interface in it. In Java, the Collection interfac
15+ min read
Collections Class in Java
Collections class in Java is one of the utility classes in Java Collections Framework. The java.util package contains the Collections class in Java. Java Collections class is used with the static methods that operate on the collections or return the collection. All the methods of this class throw th
13 min read
Collection Interface in Java
The Collection interface in Java is a core member of the Java Collections Framework located in the java.util package. It is one of the root interfaces of the Java Collection Hierarchy. The Collection interface is not directly implemented by any class. Instead, it is implemented indirectly through it
6 min read
Java List Interface
The List Interface in Java extends the Collection Interface and is a part of java.util package. It is used to store the ordered collections of elements. So in a Java List, you can organize and manage the data sequentially. Maintained the order of elements in which they are added.Allows the duplicate
15+ min read
ArrayList in Java
Java ArrayList is a part of the collections framework and it is a class of java.util package. It provides us with dynamic-sized arrays in Java. The main advantage of ArrayList is that, unlike normal arrays, we don't need to mention the size when creating ArrayList. It automatically adjusts its capac
10 min read
Vector Class in Java
The Vector class implements a growable array of objects. Vectors fall in legacy classes, but now it is fully compatible with collections. It is found in java.util package and implement the List interface. Thread-Safe: All methods are synchronized, making it suitable for multi-threaded environments.
13 min read
LinkedList in Java
Linked List is a part of the Collection framework present in java.util package. This class is an implementation of the LinkedList data structure which is a linear data structure where the elements are not stored in contiguous locations and every element is a separate object with a data part and addr
13 min read
Stack Class in Java
Java Collection framework provides a Stack class that models and implements a Stack data structure. The class is based on the basic principle of LIFO(last-in-first-out). In addition to the basic push and pop operations, the class provides three more functions of empty, search, and peek. The Stack cl
11 min read
Set in Java
The Set Interface is present in java.util package and extends the Collection interface. It is an unordered collection of objects in which duplicate values cannot be stored. It is an interface that implements the mathematical set. This interface adds a feature that restricts the insertion of the dupl
13 min read
Java HashSet
HashSet in Java implements the Set interface of Collections Framework. It is used to store the unique elements and it doesn't maintain any specific order of elements. Can store the Null values.Uses HashMap (implementation of hash table data structure) internally.Also implements Serializable and Clon
12 min read
TreeSet in Java
TreeSet is one of the most important implementations of the SortedSet interface in Java that uses a Tree(red - black tree) for storage. The ordering of the elements is maintained by a set using their natural ordering whether or not an explicit comparator is provided. This must be consistent with equ
13 min read
Java LinkedHashSet
LinkedHashSet in Java implements the Set interface of the Collection Framework. It combines the functionality of a HashSet with a LinkedList to maintain the insertion order of elements. Stores unique elements only.Maintains insertion order.Provides faster iteration compared to HashSet.Allows null el
8 min read
Queue Interface In Java
The Queue Interface is present in java.util package and extends the Collection interface. It stores and processes the data in FIFO(First In First Out) order. It is an ordered list of objects limited to inserting elements at the end of the list and deleting elements from the start of the list. No Nul
13 min read
PriorityQueue in Java
The PriorityQueue class in Java is part of the java.util package. It is known that a Queue follows the FIFO(First-In-First-Out) Algorithm, but the elements of the Queue are needed to be processed according to the priority, that's when the PriorityQueue comes into play. The PriorityQueue is based on
11 min read
Deque Interface in Java
Deque Interface present in java.util package is a subtype of the queue interface. The Deque is related to the double-ended queue that supports adding or removing elements from either end of the data structure. It can either be used as a queue(first-in-first-out/FIFO) or as a stack(last-in-first-out/
10 min read
Map Interface in Java
In Java, Map Interface is present in the java.util package represents a mapping between a key and a value. Java Map interface is not a subtype of the Collection interface. Therefore it behaves a bit differently from the rest of the collection types. No Duplicates in Keys: Ensures that keys are uniqu
12 min read
HashMap in Java
In Java, HashMap is part of the Java Collections Framework and is found in the java.util package. It provides the basic implementation of the Map interface in Java. HashMap stores data in (key, value) pairs. Each key is associated with a value, and you can access the value by using the corresponding
15+ min read
Java LinkedHashMap
LinkedHashMap in Java implements the Map interface of the Collections Framework. It stores key-value pairs while maintaining the insertion order of the entries. It maintains the order in which elements are added. Stores unique key-value pairs.Maintains insertion order.Allows one null key and multipl
7 min read
Hashtable in Java
Hashtable class, introduced as part of the Java Collections framework, implements a hash table that maps keys to values. Any non-null object can be used as a key or as a value. To successfully store and retrieve objects from a hashtable, the objects used as keys must implement the hashCode method an
13 min read
Java Dictionary Class
Dictionary class in Java is an abstract class that represents a collection of key-value pairs, where keys are unique and used to access the values. It was part of the Java Collections Framework and it was introduced in Java 1.0 but has been largely replaced by the Map interface since Java 1.2. Store
5 min read
SortedSet Interface in Java with Examples
The SortedSet interface is present in java.util package extends the Set interface present in the collection framework. It is an interface that implements the mathematical set. This interface contains the methods inherited from the Set interface and adds a feature that stores all the elements in this
8 min read
Java Comparator Interface
Comparator interface in Java is used to order the objects of user-defined classes. A comparator object is capable of comparing two objects of the same class. Following function compare obj1 with obj2. Syntax: public int compare(Object obj1, Object obj2): Suppose we have an Array/ArrayList of our own
6 min read
Java Comparable Interface
The Comparable interface in Java is used to define the natural ordering of objects for a user-defined class. It is part of the java.lang package and it provides a compareTo() method to compare instances of the class. A class has to implement a Comparable interface to define its natural ordering. Exa
4 min read
Java Comparable vs Comparator
In Java, both Comparable and Comparator are used for sorting objects. The main difference between Comparable and Comparator is: Comparable: It is used to define the natural ordering of the objects within the class.Comparator: It is used to define custom sorting logic externally.Difference Between Co
4 min read
Java Iterator
An Iterator in Java is an interface used to traverse elements in a Collection sequentially. It provides methods like hasNext(), next(), and remove() to loop through collections and perform manipulation. An Iterator is a part of the Java Collection Framework, and we can use it with collections like A
7 min read