Java

A personal collection of Java practice programs, exercises, games and networking/server projects, everything from AWT/Swing UI demos and exam preparation exercises to playable Swing games and a Vosk-powered speech recognizer.

Note: This is a learning repository. It mixes standalone source files, Swing/AWT UI projects and a Maven-based speech-recognition app. The general-purpose Java files are not part of a single build; you compile and run each file individually (instructions below).

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Repository Structure

Folder	What's inside
Action Events/	AWT event-handling demos (action, item, key, mouse, focus, window events)
Applet/	A classic Java applet example (First.html + First.java)
AWT/	AWT UI examples, dialogs, frames, menus, a student registration form
Exam-Prep/	OOP, interfaces, packages, exceptions, threads and small simulations (coffee shop, restaurant, to-do)
File Handling/	File I/O examples, read/write files, copy between files, vowel-word copier
Games/	Playable Swing games, Snake, Tetris, Breakout, Flappy Bird, Pong, Minesweeper, Frogger, Space Invaders, Pac-Man, Tic-Tac-Toe, Dino Runner
IntelliJ Projects/	Programs imported from a previous IntelliJ IDEA workspace (games, calculators, console programs)
JDBC/	JDBC database examples (scrollable results, interactive console app)
LayoutManager/	Swing layout manager demos, Grid, Border, Flow, GridBag, Group, null and nested layouts
Practical/	Practical-lab programs, room/rectangle classes, simple-interest calculator, employee details form and DB
Practice/	Swing practice, widgets, menus, dialogs, popups, color/file choosers and a small socket client/server
Servers and sockets/	Networking, TCP/UDP chat, file transfer, RMI "Hello", URL/HTTP, JavaMail, JavaFX UI samples
SpeechRecognizer/	Maven project, real-time speech-to-text using Vosk (mic input)

Plus a handful of root-level scratch programs (arrayAge, numberGame, primes, pattern, newFile, task).

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Prerequisites

• JDK 17+ (many programs use modern syntax: switch expressions, text blocks, pattern matching). Check with: java -version
• No external build tool is required for most folders, just the JDK.
• SpeechRecognizer additionally needs Apache Maven (and a downloaded Vosk model, see its README).

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Getting Started

Because these are standalone files, run them directly with javac + java:

# 1. Go into a folder
cd Games

# 2. Compile a single program
javac SnakeGame.java

# 3. Run it
java SnakeGame

Compiling files that contain Unicode text (dice, emoji, etc.)

Some files (e.g. IntelliJ Projects/DiceRolling.java, SpeechRecognizer) contain non-ASCII characters. On Windows, tell the compiler to read them as UTF-8:

javac -encoding UTF-8 DiceRolling.java && java DiceRolling

Running GUI programs

AWT/Swing programs (folders like AWT, LayoutManager, Practice) compile and run the same way, a window will appear when you run them:

cd LayoutManager
javac FlowLayoutDemo.java
java FlowLayoutDemo

Running server/client pairs

Programs in Servers and sockets/ run in two terminals, e.g. TCP chat:

# Terminal 1, server
cd "Servers and sockets/Chat server"
javac TCPChatServer.java && java TCPChatServer

# Terminal 2, client
javac TCPChatClient.java && java TCPChatClient

Running the SpeechRecognizer (Maven)

cd SpeechRecognizer
mvn compile exec:java   # or: mvn package && java -jar target/SpeechRecognizer-1.0-SNAPSHOT.jar

Full setup (model download, dependencies) is in SpeechRecognizer/README.md.

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Playing the Games

Each game is a Swing app with its own controls. Quick table:

Game	Source	Controls
Snake	Games/SnakeGame.java	Arrow keys
Tetris	Games/Tetris.java	Arrows + space/rotate
Breakout	Games/BreakoutGame.java	Mouse / arrow keys
Flappy Bird	Games/FlappyBird.java	SPACE
Space Invaders	Games/space-invaders-java/	Arrows + SPACE
Pac-Man	Games/pacman-java/	Arrow keys
Pong	Games/PongGame.java	Mouse / keys
Minesweeper	Games/Minesweeper.java	Mouse click
Frogger	Games/Frogger.java	Arrow keys
Dino Runner	Games/DinoRunner.java	SPACE

See Games/README.md for details.

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Folder Documentation

Each folder ships with its own README:

• Action Events
• Applet
• AWT
• Exam-Prep
• File Handling
• Games
• IntelliJ Projects
• JDBC
• LayoutManager
• Practical
• Practice
• Servers and sockets
• SpeechRecognizer

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What Is Ignored (.gitignore)

Compiled artifacts and local/IDE files are not committed:

• *.class compiled bytecode
• target/ (Maven output), out/, bin/
• IDE folders: .idea/, *.iml, .vscode/, .project, .classpath
• SpeechRecognizer/libs/ (jars resolved by Maven) and SpeechRecognizer/models/ (download the model separately)
• Runtime data files (received_file.txt, employee_details.txt)
• OS junk (.DS_Store, Thumbs.db), logs

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Contributing

Although this repo is mostly personal learning material, contributions are welcome, fixes, better comments, new games, or documentation improvements. See CONTRIBUTING.md and CODE_OF_CONDUCT.md.

License

Distributed under the MIT License. See LICENSE for details.

Changelog

See CHANGELOG.md for the version history.