Noob question about codeplayground

Question

I copied my code from Eclipse to save it here, but it will not run.
My question is, how do I create a new class in codeplayground?
The error message I get is: "Uncaught SyntaxError: Unexpected token class
Line: 1"

Edit: This is the code. The reason I wanted to save it here is because I want to know exactly why I get the strange output that I am getting.

public class MyProgram
{
public static void main(String[] args)
{
int x = 1;
byte z = 1;

while ( x<10000 )
{
System.out.println(x);

x += z++;
}
}
}

Answer 1

There should be no difference to any other Java tool: It is just class CLASSNAME {...}

Maybe you can link your code here so that people can help you better.

Answer 2

Added the code to my original post now @merkrafter