JAVA-DEV

A comprehensive Java learning repository for backend development fundamentals.

📖 Overview

This repository contains Java programming examples and learning materials designed to help understand core Java concepts and backend development principles. It includes practical code examples, documentation, and educational resources.

📁 Repository Structure

JAVA-DEV/
├── First Code/           # Basic "Hello World" Java program
│   └── firstCode/
│       └── src/
│           └── Main.java
├── varNdataType/        # Variables and data types demonstration
│   ├── src/
│   │   └── VariableDatatype.java
│   └── README.md
├── #NOTES/              # Learning materials and documentation
│   ├── Data_Types.pdf
│   ├── First_Code_in_Java.pdf
│   ├── How_Java_works.pdf
│   └── Variables.pdf
└── README.md           # This file

🚀 Projects

1. First Code

Location: First Code/firstCode/src/Main.java

A simple "Hello World" program that demonstrates:

• Basic Java syntax
• Main method structure
• Console output using System.out.println()

To run:

cd "First Code/firstCode/src"
javac Main.java
java Main

Expected output:

Hello world!

2. Variables and Data Types

Location: varNdataType/src/VariableDatatype.java

A comprehensive example demonstrating:

• Different Java data types (int, double, float, char, boolean)
• Variable declaration and initialization
• Printing variable values

To run:

cd varNdataType/src
javac VariableDatatype.java
java VariableDatatype

Expected output:

Integer: 42
Double: 3.14
Float: 3.5
Character: A
Boolean: true

📚 Learning Materials

The #NOTES/ directory contains PDF documentation covering:

• Data_Types.pdf - Comprehensive guide to Java data types
• First_Code_in_Java.pdf - Introduction to writing your first Java program
• How_Java_works.pdf - Understanding Java compilation and execution
• Variables.pdf - Variables declaration, initialization, and usage

🛠️ Prerequisites

• Java Development Kit (JDK) 8 or higher
• Command line interface (Terminal/Command Prompt)
• Text editor or IDE (IntelliJ IDEA recommended, as projects include .iml files)

💡 Getting Started

1. Clone the repository:

   git clone https://github.com/dexter-code03/JAVA-DEV.git
   cd JAVA-DEV

2. Verify Java installation:

   java -version
   javac -version

3. Run the examples:

   • Navigate to any project directory
   • Compile the Java file: javac ClassName.java
   • Run the compiled program: java ClassName

🎯 Learning Objectives

After working through this repository, you should understand:

• Basic Java syntax and structure
• How to write, compile, and execute Java programs
• Java primitive data types and their usage
• Variable declaration and initialization
• Console input/output operations
• Java development workflow

🤝 Contributing

This is a learning repository. Feel free to:

• Add more examples
• Improve documentation
• Fix any issues you find
• Add more learning materials

📝 Notes

• Projects are configured for IntelliJ IDEA (.iml files present)
• All code examples are tested and working
• PDF materials provide theoretical background for practical examples

📄 License

This repository is for educational purposes. Feel free to use and modify the code for learning.

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Happy Learning! 🚀