Java Tutorial

Learn Java

Java is one of the world's most widely used programming languages.

Java is free to use, and runs on all platforms.

Examples in Each Chapter

an online editor makes it easy to learn Java. You can edit Java code and view the result in your browser.

Example

public class Main {
  public static void main(String[] args) {
    System.out.println("Hello World");
  }
}

Exercises

Many chapters in this tutorial end with an exercise where you can check your level of knowledge.

What You'll Learn

This tutorial will guide you step by step, with examples and exercises along the way:

• Java syntax and basic structure
• Variables, data types, and operators
• Conditions and loops
• Methods and parameters
• Arrays and strings
• Object-oriented programming
• Classes, objects, inheritance, and polymorphism
• Exception handling
• File handling
• Collections and useful built-in classes

Java Quiz Check your understanding with a short quiz and see how well you know Java. Start Java Quiz

Learn by Examples Learn by examples! This tutorial supplements all explanations with clarifying examples. See All Java Examples

Java Reference

You will also find complete keyword and method references:

Reference Overview Java Keywords String Methods Math Methods Output Methods Arrays Methods ArrayList Methods LinkedList Methods HashMap Methods Scanner Methods File Methods FileInputStream FileOutputStream BufferedReader BufferedWriter Iterator Methods Collections Methods System Methods Errors & Exceptions