Difficulty: Beginner
Estimated Time: 10 minutes

This playground provides a personalised sandboxed environment for you to learn and explore Java.

What are playgrounds?

Playgrounds give you a configured environment to start playing and exploring using an unstructured learning approach.

Playgrounds are great for experimenting and trying samples. To learn more about the technology then start with one of our labs

Thank you for trying the playground. More courses and scenarios are available at on our homepage

Don’t stop now! The next scenario will take about 20 minutes to complete. You can pause and come back at any time.

Java Language Playground

Hello World

Copy the following code into the editor.

public class App {

  public static void main(String[] args) {
    // Prints "Hello, World" to the terminal window.
    System.out.println("Hello, World");


Step 1) Compile using javac App.java

Step 2) Execute using java App

Interested in writing your own Java scenarios and demos? Visit www.katacoda.com/teach