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Well thx i did that and it worked thx for the advice man .

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.Random;
import java.applet.*;
public class SimpleApplet extends JApplet
{
JButton ng;
JPanel...

Problem solved thx

Well yes the constructor i call yes there is in the Box class. The Box construtctor takes a double x and it creates a cube. all i want to do is to prevent the Box to create a cube if i a negative...

well guys this is my code

public class MyBox extends Box
{
public MyBox(double x)
{
if(this.x >0){
super(x);
}
}