Java Project Hub

This repository showcases a collection of Java projects that demonstrate various aspects of Java programming, including GUI development, socket programming, database management, file handling, and more. Each project is designed to solve a specific problem or implement a particular functionality, with detailed explanations provided for each.

Table of Contents

1. Chat Messenger using Sockets
2. Clone DBMS Application
3. Packer-Unpacker (File Packer Unpacker)

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Chat Messenger using Sockets

Overview

This Java application demonstrates a simple chat server and client using Swing for the graphical user interface (GUI) and sockets for communication between them.

Features

• ServerGUI:

  • Opens a GUI window displaying chat messages.
  • Allows the server to send messages to connected clients.
  • Includes a log button to save the chat log.

• ClientGUI:

  • Opens a GUI window for chatting with the server.
  • Displays messages from the server in different colors.
  • Allows chat log saving with a log button.

How to Run

1. Compile the Code:

   javac ServerGUI.java
   javac ClientGUI.java

2. Run the Server:

   java ServerGUI

3. Run the Client:

   java ClientGUI

What You'll Learn

• Java GUI Development: Gain practical experience with Swing for GUI development.
• Networking: Learn the fundamentals of socket programming for communication between applications.
• Multithreading: Understand how to handle concurrent tasks efficiently using threads.
• File Operations: Explore file I/O operations, including saving chat logs.
• Event-Driven Programming: Delve into event handling in Java applications.

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Clone DBMS Application

Overview

This project is a Java-based database management system (DBMS) application designed to manage student records. It provides functionalities for inserting, selecting, updating, and deleting records, along with aggregation and sorting operations.

Features

• Insert Records: Add new student records.
• Select Records: Retrieve student records based on criteria or list all records.
• Update Records: Modify existing student records.
• Delete Records: Remove student records.
• Aggregate Functions: Calculate maximum, minimum, average, and sum of student marks.
• Sorting: Sort student records by age or marks.
• File Storage: Save and load records from a CSV file.

Versions

• Version 1: Basic implementation with core DBMS functionalities.
• Version 2: Added functionalities for updating, deleting, and sorting records. Records are stored in student.csv.
• Version 3: Improvements include duplicate record prevention using hashCode and enhanced code with Stream API.
• Final Version: Integrates all improvements from previous versions.

How to Run

1. Compile the Code:

   javac DbmsApplicationMain.java

2. Run the Application:

   java DbmsApplicationMain

3. Interact with the DBMS:

   • Insert, select, update, delete, sort records, and perform aggregate functions using custom commands.

Knowledge Gained

• Database Management: Understanding basic DBMS operations.
• File Handling: Managing data persistence using CSV files.
• Code Optimization: Preventing duplicate records and enhancing code efficiency with Stream API.

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Packer-Unpacker (File Packer Unpacker)

Overview

The Packer-Unpacker is a Java-based desktop application that allows users to pack and unpack files. It features a user-friendly graphical interface built using Swing, designed for secure and efficient file management.

Features

• User Authentication: Secure login system with username and password validation.
• File Packing: Pack files with specific extensions into a single output file.
• File Unpacking: Extract files from a packed file with format verification.
• Security Features: Password strength validation and login attempt limitations.

How to Run

1. Clone the Repository: Download or clone the repository to your local machine.
2. Compile the Code:

   javac *.java

3. Create and Run the JAR File:

   jar -cvfm packer.jar MANIFEST.MF *.class
   java -jar packer.jar

Knowledge Gained

• Swing Framework: Building GUI applications in Java.
• Event Handling: Implementing event listeners and handling user interactions.
• File Handling: Practical knowledge of file I/O operations.
• Threading and Exception Handling: Implementing multithreading and error handling in Java.

Future Enhancements

• Encryption: Implement file encryption for enhanced security.
• User Management: Support multiple users with different roles.
• File Compression: Add file compression functionality.

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Each project in this repository offers a unique learning experience, from networking and GUI development to database management and file handling. Explore the projects to enhance your Java programming skills!