麻烦看一下这道java编程哪里错了

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

public class AppletApp extends Applet{
/**
*
*/
// private static final long serialVersionUID = -5234734486830015017L;

public static void main(String args[]) {
Frame frame = new Frame("Application");
AppletApp app=new AppletApp();

frame.add("Center", app);
frame.setSize(200,200);
frame.validate();
frame.setVisible(true);

frame.addWindowListener(new WindowControl(app));

app.init();
app.start();
}

public void paint(Graphics g) {
g.drawString("Hello", 25, 25);
}

public void destroy() {
System.exit(0);
}

class WindowControl extends WindowAdapter {
Applet c;
public WindowControl (Applet c) {
this.c = c;
}

public void windowClosing(Wind

public class AppletApp extends Applet {

/**
*
*/
// private static final long serialVersionUID = -5234734486830015017L;
public static void main(String args[]) {
new AppletApp().AppletAppinit();
}

void AppletAppinit() {
Frame frame = new Frame("Application");
AppletApp app = new AppletApp();

frame.add("Center", app);
frame.setSize(200, 200);
frame.validate();
frame.setVisible(true);

frame.addWindowListener(new WindowControl(app));

app.init();
app.start();
}

public void paint(Graphics g) {
g.drawString("Hello", 25, 25);
}

public void destroy() {
System.exit(0);
}

class WindowControl extends WindowAdapter {

Applet c;