Java Tutorial

Introduction

Welcome to the Java Tutorial! This tutorial is designed to help beginners and intermediate developers understand the core concepts of Java programming, from basic syntax to advanced topics.

Prerequisites

Before starting this tutorial, you should have:

• Basic knowledge of programming concepts.
• Java Development Kit (JDK) installed on your system.
• An Integrated Development Environment (IDE) such as IntelliJ IDEA, Eclipse, or VS Code (optional).

Installation

Step 1: Download and Install JDK

1. Visit Oracle's official website or OpenJDK.
2. Download the latest stable JDK version.
3. Follow the installation instructions for your operating system.

Step 2: Set Up Environment Variables

• On Windows:
  1. Open System Properties > Advanced > Environment Variables.
  2. Add the JDK bin directory to the Path variable.
  3. Verify installation using java -version in the command prompt.
• On Mac/Linux:
  • Add the following lines to your .bashrc or .zshrc file:

    export JAVA_HOME=/path/to/jdk
    export PATH=$JAVA_HOME/bin:$PATH

  • Run source ~/.bashrc or source ~/.zshrc.

Topics Covered

1. Introduction to Java

   • History of Java
   • Features of Java
   • Java Virtual Machine (JVM)

2. Basic Syntax

   • Variables and Data Types
   • Operators
   • Control Flow Statements (if-else, loops, switch-case)

3. Object-Oriented Programming (OOP) Concepts

   • Classes and Objects
   • Constructors
   • Inheritance
   • Polymorphism
   • Abstraction and Encapsulation

4. Exception Handling

   • Try-Catch Blocks
   • Throw, Throws, and Finally
   • Custom Exceptions

5. Collections Framework

   • Lists, Sets, and Maps
   • Iterators

6. File Handling

   • Reading and Writing Files
   • Serialization

7. Multithreading

   • Thread Lifecycle
   • Synchronization

8. JDBC (Java Database Connectivity)

   • Connecting Java with MySQL/PostgreSQL
   • CRUD Operations

9. Spring Framework (Introduction)

   • Spring Boot Basics
   • Dependency Injection
   • REST API with Spring Boot

Running Java Programs

1. Write a Java program in a file with a .java extension.
2. Compile the program using:

   javac filename.java

3. Run the program using:

   java filename

Resources

• Official Java Documentation
• W3Schools Java Tutorial
• GeeksforGeeks Java Guide

Contributing

Feel free to contribute by suggesting improvements, fixing errors, or adding new topics.

License

This tutorial is open-source and free to use under the MIT License.