La deserción no es una opción

import java.applet.Applet;
import java.awt.Font;
import java.util.Date;
import java.awt.Color;
public class Circulos01 extends Applet
implements Runnable {
int x1, y1;
Thread runner;
public void init(){
x1 = (int)(Math.random()*(getSize().width-10));
y1 = (int)(Math.random()*(getSize().height-
10));
}
public void start() {
if (runner == null) {
runner = new Thread(this);
runner.start();
}
}
public void update(Graphics g){
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