import java.awt.*;
import java.awt.event.*;
class Menu1 extends WindowAdapter implements ActionListener,MouseListener
{
    Frame f;
    MenuBar mb1;
    Menu mf1,me1,mh1,md1;
    CheckboxMenuItem cbmi1;
    PopupMenu pm1;
    Dialog d;
    public void display()
    {
        f = new Frame("Menu");
        f.setSize(240,180);
        f.setLocation(400,200);
        f.setBackground(Color.lightGray);
        f.addWindowListener(this);
        f.addMouseListener(this);        //為框架f注冊鼠標事件監(jiān)聽程序
        f.setVisible(true);
        pm1 = new PopupMenu("Popup");    //生成一個彈出式菜單對象
        pm1.add(new MenuItem("Cut"));    //加入菜單項
        pm1.add(new MenuItem("Copy"));
        pm1.add(new MenuItem("Paste"));
        pm1.addSeparator();              //加分隔線
        pm1.add(new MenuItem("Exit"));
        pm1.addActionListener(this);     //為菜單注冊事件監(jiān)聽程序
        f.add(pm1);                      //框架f上添加彈出式菜單
        d = new Dialog(f,"Dialog Example",true);
        d.add(new Label("打開一個對話框"),"Center");
        d.setSize(120,60);
        d.setLocation(500,300);
        d.addWindowListener(this);      //為對話框d注冊事件監(jiān)聽程序
        addmyMenu();
    }        
    public void addmyMenu()
    {
        mb1 = new MenuBar();             //生成一個菜單欄
        f.setMenuBar(mb1);               //框架f上添加菜單欄
        mf1 = new Menu("File");          //生成一個菜單
        me1 = new Menu("Edit");
        mh1 = new Menu("Help");
        mb1.add(mf1);                    //菜單欄中加入菜單
        mb1.add(me1);
        mb1.add(mh1);
        mf1.add(new MenuItem("Open"));   //生成菜單項并加入到菜單
        mf1.add(new MenuItem("Save",new MenuShortcut(KeyEvent.VK_S)));
        mf1.addSeparator();              //加分隔線
        md1 = new Menu("Delete");
        mf1.add(md1);                    //菜單加入到菜單中成為二級菜單
        cbmi1 = new CheckboxMenuItem("Bold",true);
        mf1.add(cbmi1);
        mf1.add(new MenuItem("Exit"));
        mf1.addActionListener(this);     //為菜單注冊事件監(jiān)聽程序
        me1.add(new MenuItem("Cut"));
        me1.add(new MenuItem("Exit"));
        me1.addActionListener(this);
    }
    public void windowClosing(WindowEvent e)
    {
        if(e.getSource()==d)
             d.setVisible(false);
        else
             System.exit(0); 
    }
    public void actionPerformed(ActionEvent e)
    {                                    //選擇菜單項時觸發(fā)
        if(e.getActionCommand()=="Open")
            d.setVisible(true);
        if(e.getActionCommand()=="Exit")
            System.exit(0);
    }
    public void mouseClicked(MouseEvent mec)
    {                                    //單擊鼠標時觸發(fā)
        if (mec.getModifiers()==mec.BUTTON3_MASK)  //單擊的是鼠標右鍵
            pm1.show(f,mec.getX(),mec.getY()); //在鼠標單擊處顯示菜單
    }
    public void mousePressed(MouseEvent mep)    {    }
    public void mouseReleased(MouseEvent mer)   {    }
    public void mouseEntered(MouseEvent mee)    {    } 
    public void mouseExited(MouseEvent mex)     {    }
    public void mouseDragged(MouseEvent med)    {    }
    public static void main(String arg[])
    {
        (new Menu1()).display();
    }
}