Learn Java Programming

Master Java from basics to advanced topics with concise lessons and practical examples. Follow a structured path inspired by reputable learning resources.

Start Learning Try Java Online

Reference guide: Programiz — Getting Started with Java [0]

Tutorial Contents
Getting Started
Basics
Control Flow
Methods & Arrays
Object-Oriented Programming
Exceptions

Hello World in Java

The classic first program prints text to the console using System.out.println.

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

Compile with javac Hello.java and run with java Hello.

  • System.out is a standard output stream; printing is buffered and line-based.
  • println appends a newline; print does not.
  • Ensure the filename matches the public class (Hello.java for public class Hello).
  • When using packages, run with the fully qualified class name (e.g., java com.example.Hello).

Java Tutorial FAQs

How do I run Java online?
Use the Java Online Compiler to write and execute Java directly in your browser—no setup needed. Click "Try Java Online" above to get started.
How do I install Java on Windows?
Download the JDK installer, run it, then set JAVA_HOME and update the Path variable to include the JDK bin directory. Verify with java --version. [0]
How do I install Java on macOS?
Install the appropriate JDK DMG (x64 or ARM64). In your shell profile, set export JAVA_HOME=$(/usr/libexec/java_home) and update PATH to include $JAVA_HOME/bin. Verify with java --version. [0]
Do I need the JDK to compile Java?
Yes. The JDK provides the compiler (javac) and tools needed to build Java applications. For quick tests, the online compiler is a convenient alternative.
What is Java used for?
Java powers cross-platform applications including web services, Android apps, enterprise systems, and tooling built on the JVM. Its strong OOP model and rich libraries make it versatile.

Learn Java the Practical Way

Whether you’re new to programming or expanding your skills, this Java tutorial focuses on hands-on learning. Each topic pairs clear explanations with short, working examples that you can run online. Move from fundamentals—variables, data types, and control flow—to core OOP concepts like classes, inheritance, and interfaces. Along the way, you’ll see idiomatic Java patterns and simple best practices that build confidence.

Why this guide? It’s designed for real-world use: fast to read, easy to try, and friendly on mobile. Bookmark it and return whenever you need a refresher or a quick example.