用java编程

import java.awt.*;
import java.awt.event.*;

public class Cdzr extends Frame implements ActionListener{
MenuBar mb;
Menu Fruits;
Menu Drink;
MenuItem apple, pear;
public Cdzr(){
super("菜单助人");
setSize(400,300);
setVisible(true);
mb=new MenuBar();
setMenuBar(mb);
Fruits=new Menu("Fruits");
Drink=new Menu("Drink");
mb.add(Fruits);
mb.add(Drink);
apple=new MenuItem("apple");
pear=new MenuItem("pear");
Fruits.add(apple);
Fruits.add(pear);

addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent we){
System.exit(0);
}
});

apple.addActionListener(this);
pear.addActionListener(this);
}

public void actionPerformed(ActionEvent e){
if(e.getSource()==apple){ }
if(e.getSource()==pear){ }
}

public static void main(String[] args){
new Cdzr();
}
}
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在网吧写的，没编译过，应该没问题。。。
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

class menu
{
public static void main(String[] args)
{
frame f = new frame();
f.setBounds(100,100,200,300);
f.setTitle("菜单");
f.setVisible(true);
}
}
class frame extends JFrame
{
JMenuBar menubar = new JMenuBar();
JMenu fruitsmenu = new JMenu("Fruits");
JMenu drinkmenu = new JMenu("Drink");
JMenuItem apple = new JMenuItem("apple");
JMenuItem pear = new JMenuItem("pear");
public frame()
{
fruitsmenu.add(apple);
fruitsmenu.add(pear);
menubar.add(fruitsmenu);
menubar.add(drinkmenu);
this.setMenuBar(menubar);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}