How to write your first Java program. The first non-trivial Java program I ever wrote was a number guessing game, and it gave me a good idea of how variables, loops and conditional statements work. I ...

Java basics: your first program Head over to compilejava.net and you will be greeted by an editor with a bunch of code already in it. (If you would rather use a different IDE or app that’s fine too!

First things first, you will have to write the code that you want to run and save that as a Java executable file. For this purpose, you can use either MS Word or Notepad.