How to Learn Java: A Beginner's Guide

Java has been one of the most popular programming languages for over 25 years. It powers Android apps, enterprise systems, and backend services. Here's how to learn Java from scratch.

Why Learn Java?

• Job market — Massive demand in enterprise
• Android development — Build mobile apps
• Cross-platform — Runs on any operating system
• Strong typing — Catches errors early

Setting Up Java

1. Download JDK from oracle.com
2. Install IntelliJ IDEA or VS Code
3. Write your first program

// Your first Java program
public class HelloWorld {
  public static void main(String[] args) {
    System.out.println("Hello, World!");
  }
}

Java Fundamentals

// Variables
String name = "John";
int age = 25;
boolean isActive = true;

// Arrays
String[] fruits = {"Apple", "Banana", "Cherry"};

// Methods
public static int add(int a, int b) {
  return a + b;
}

// Classes
public class Person {
  String name;
  int age;

  public Person(String name, int age) {
    this.name = name;
    this.age = age;
  }

  public String greet() {
    return "Hi, I'm " + name;
  }
}

Learning Path

1. Week 1-2: Variables, data types, operators
2. Week 3-4: Methods, conditionals, loops
3. Month 2: Object-oriented programming
4. Month 3: Collections, file handling
5. Month 4: Build projects