Hands-on workspace

Practice the Java you just learned

Edit a lesson snippet, check its essential structure, and export a real .java file for your own project.

Current lesson: Your first Java program

Main.java

Java

Build challenge

Print a three-line welcome message for your future Java app.

Try changing the code before checking it. Learning happens when you make the program your own.

Choose “Check code” to review the shape of your Java program.

Local-first note

Your lesson progress and workspace are saved only in this browser. Use Download to take your Java source file into a real project.