Ball moving across the screen?

[Slicknife]

Well at school I am using an IDE called Ready to Program, which you probably haven't heard of. I have to make a ball move diagonally across the screen and so far I have this piece of code that apparently worked for some people but it doesn't for me. I think I missed something?

import java.awt.*;
import hsa.Console;
public class Template
{
    static Console c = new Console ();
    public static void main (String args[])
    {
    
        int x=0, y=0;
        
        while(true)
        {
        c.setColor(Color.black);
        c.fillOval(x,y,30,30);
        for (int i =1; i <= 100; i++)
        
        
        c.setColor(Color.white);
        c.fillOval(x,y,30,30);
        
        }
    
    }
    
}

Apologies if this IDE is unfamiliar to you but any help is appreciated.

[Norm]

it doesn't for me

Can you explain what "doesn't work" means?

Since you are using a third party package (hsa) its hard for anyone here to compile and test the code.