GUI学习笔记MyMenuDemo.java

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//做菜单
import java.awt.*;
import java.awt.event.*;

class MyMenuDemo
{
private Frame f;
private MenuBar mb;
private Menu m,subMenu;
private MenuItem closeItem,subItem;

MyMenuDemo()
{
  init();
}
public void init()
{
  f=new Frame("我的菜单测试");
  f.setBounds(300,200,600,500);
  f.setLayout(new FlowLayout());


  mb=new MenuBar();//只是一个Bar 参数为空

  m=new Menu("文件");

  subMenu=new Menu("子菜单");

  subItem=new MenuItem("子条目");

  closeItem=new MenuItem("退出");

  f.setMenuBar(mb);
  mb.add(m);
  m.add(subMenu);
  subMenu.add(subItem);
  m.add(closeItem);

myEvent();
f.setVisible(true);

}
public void myEvent()
{
  f.addWindowListener(new WindowAdapter()
  {
   public void windowClosing(WindowEvent e)
   {
    System.exit(0);
   }
  }
  );
  closeItem.addActionListener(new ActionListener()
  {
   public void actionPerformed(ActionEvent e)
   {
    System.exit(0);
   }
  }
  );
}
public static void main(String[] args)
{
  new MyMenuDemo();
}
}