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I'm on Vista and Java 1.6. Note that's not a full code though. In full, it would look something like


import java.awt.*;
import java.lang.Math;

public class RandomNumberGenerator {
public...

I'd recommend just using the math library approach


import java.lang.Math;

addsubnumber1 = (int) Math.floor(Math.random()*21);
addsubnumber2 = (int) Math.floor(Math.random()*21);