This is a simple environment for experimenting with Java. The panel on the left is a code editor where you can write Java code. On this page your goal is to write a main method that implements the classic hello-world program.

When you run your program it runs in the terminal on the right: anything it prints shows up there, and if it reads input it will wait for you to type something in the terminal and press Enter.

Every time you run your program it will be saved and you can use the “Revisions” drop down to go back to old versions. To keep your code tidy, you can right click in the code editor and choose “Format document” from the pop-up menu.

And you can collapse these instructions by clicking on the triangle to the left.