Congratulations, you are about to write the world's simplest Java program. So to begin, bring up a text editor. You should lay it out just like I have - use the tab key. It's probably worth mentioning at this point that capitals do matter in Java, a lot . You can have something called abc and something else called ABC and they are as different as if they were called chalk and cheese .
Computers are more picky than the bogeyman.
Once you think your version looks like mine, save it. You must use the name Hello.java when you do. Let's quickly explain the program, and then go on to the next lesson. We'll come back to exactly what class means later. For now all you need to know about this line is that, when you run a Java program, it has to have a line exactly like this one.