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.

Java Programming Tutorial — Learn Java Step by Step

Java is one of the most widely-used programming languages in the world, powering Android apps, enterprise backends, cloud services, and scientific computing. This tutorial teaches Java from the ground up with practical, runnable examples you can try in our free Java Compiler or any local IDE.

Each topic includes multiple code examples with explanations, expected output, and best practices. Whether you are a complete beginner or refreshing your knowledge of a specific feature, every page gives you immediately usable code.

What This Tutorial Covers

  • Basics: Hello World, variables, data types, operators
  • Control Flow: if/else, switch, for, while, break/continue
  • Methods: Parameters, return types, overloading, recursion
  • Arrays & Strings: Declaration, manipulation, StringBuilder
  • OOP: Classes, objects, constructors, encapsulation
  • Inheritance: extends, super, abstract classes, final
  • Interfaces: Abstraction, default methods, functional interfaces
  • Collections: ArrayList, HashMap, HashSet, LinkedList
  • Exceptions: try/catch/finally, custom exceptions
  • Generics: Type parameters, bounded types, wildcards
  • Streams (Java 8+): filter, map, reduce, collect
  • File I/O: BufferedReader, Files API, serialisation

Why Learn Java in 2026?

  • Enterprise dominance: Java powers most Fortune 500 backends via Spring Boot and Jakarta EE
  • Android development: Java + Kotlin build apps for 3+ billion active Android devices
  • Job market: Top 3 most-demanded language on LinkedIn, Indeed, and Stack Overflow survey
  • Platform independence: Write once, run anywhere — bytecode runs on any JVM
  • Modern evolution: Java 17/21 LTS added records, sealed classes, virtual threads, pattern matching
  • Ecosystem: Maven/Gradle, IntelliJ IDEA, 100,000+ libraries, massive community

How to Get Started

  1. Run code online: Use our Java Compiler — no installation needed
  2. Install JDK locally: Download OpenJDK 17+ from adoptium.net
  3. Choose an IDE: IntelliJ IDEA Community (free), Eclipse, or VS Code with Java Extension Pack
  4. Follow topics in order: Start from Hello World and progress sequentially
  5. Build a project: After OOP, build a small CRUD app to solidify your knowledge

Frequently Asked Questions

Do I need prior programming experience?

No. This tutorial starts from absolute basics (Hello World, variables) and progresses to advanced topics. Each concept builds on the previous one.

Which Java version should I use?

Java 17 (LTS) is recommended. All examples in this tutorial work on Java 17+. Our online compiler uses the latest stable release.

How long does it take to learn Java?

Basics take 4–6 weeks of daily practice. Intermediate topics (collections, generics) add 4–6 more weeks. Job-readiness typically requires 3–6 months total.

Is this tutorial free?

Yes, completely free. No account, no sign-up. All topics and examples are available without any restriction.

Who Is This For?

Complete beginners choosing Java as their first language. CS students preparing for university courses and exams. Self-taught developers building a strong OOP foundation. Python/JS developers learning Java for backend or Android work. Interview candidates practising Java data structures. Professional developers needing a quick reference for specific Java features.