[Java] HILFE suche Fehler in Pong-Spiel

import java.applet.Applet;
import java.awt.*;
import java.awt.Dimension;

public class plong4 extends Applet {
 
 int x=100,y=100, vx=2, vy=1;
 int hoehe,breite;
 int mouseY, mouseX;
 
 public plong4() {
 super();
 }
 public void init() {
 this.setSize(new Dimension(300, 200));
 breite=getWidth();
 hoehe=getHeight();
 }
 public void paint(Graphics g){
 if(x<=-1){
 if(y<=mouseY+30){ 
 vx=-vx; 
 }
 }
 else{
 if(x<=0){ 
 g.drawString("Verloren!", 20, 90);
 }
 setball(g); 
 setschlaeger(g);
 x = x + vx; 
 y = y + vy;
 if(x>breite-20) vx=-vx;
 if(y<20||y>hoehe-20) vy=-vy;
 
 pause(10);
 repaint();
 }
 }
 public void setball(Graphics g){
 g.setColor(Color.RED); 
 g.fillOval(x-20, y-20, 20, 20);
 g.setColor(Color.BLACK); 
 g.drawOval(x-20, y-20, 20, 20);
 }
 public void setschlaeger(Graphics g){
 g.setColor(Color.BLACK);
 g.fillRect(mouseX, mouseY, 10, 70);
 }
 public boolean mouseMove(Event e, int x, int y){
 mouseY = y;
 return true;
 }
 private void pause(int n){
 try {
 Thread.sleep(n);
 }
 catch(InterruptedException e){}
 }
}