I've made a JFrame subclass, called World. It looks like this:
Help is another class, which has only a method to get random numbers, that works equal to Greenfoot.getRandomNumber.
When I use the main method, the JFrame opens and I get this error message:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Comparison method violates its general contract!
For higher width and higher height it doesn't finishes loading at all.
Has anyone knowledge about that?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.Color;
public class World extends JFrame
{
private JLabel[][] pixel;
private int width;
private int height;
public World(String title, int width, int height){
super(title);
int border = 10;
this.width = width;
this.height = height;
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
int frameWidth = width+(2*border);
int frameHeight = height+(2*border);
setSize(frameWidth, frameHeight);
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
int x = (d.width - getSize().width) / 2;
int y = (d.height - getSize().height) / 2;
setLocation(x, y);
setResizable(false);
Container cp = getContentPane();
cp.setLayout(null);
//meins
pixel = new JLabel[width][height];
for(int j = 0; j < height; j++){//y
for(int i = 0; i < width; i++){//x
JLabel a = new JLabel();
a.setBounds(i+border,j+border,1,1);
cp.add(a);
pixel[i][j] = a;
System.out.println("x: "+i+" y: "+j);
}
}
setVisible(true);
System.out.println("Done");
}
public void randomizeImage(){
for(int j = 0; j < height; j++)//y
for(int i = 0; i < width; i++)//x
if(pixel[i][j]!=null)
pixel[i][j].setBackground(randomColor());
}
public Color randomColor(){
return new Color(help.random(256),help.random(256),
help.random(256),help.random(256));
}
public static void main(String[] args){
World w = new World("World", 100, 100);
w.randomizeImage();
}
}
