applet paint() refresh problems

the following applet is supposed to draw random lines on the screen, but
doesn't. does anyone know how to make it refresh?

thanks in advance

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
import java.text.*;
import java.lang.*;

public class UI2 extends Applet{
private int x1,y1,x2,y2;

public void init() {
for(;;) {
x1=(int)(Math.random()*100);
y1=(int)(Math.random()*100);
x2=(int)(Math.random()*100);
y2=(int)(Math.random()*100);
repaint();
}
}


public void paint(Graphics g) {
g.setColor(Color.black);

g.drawLine(x1, y1, x2, y2);
}

public void update(Graphics g) {
paint(g);
}

}



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