windemo2.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

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

public  class WinDemo2 extends Frame implements ActionListener,MouseListener
{
  TextArea ta=new TextArea();
  PopupMenu pm=new PopupMenu();
  MenuItem item1=new MenuItem("Copy");
  MenuItem item2=new MenuItem("Cut");
  MenuItem item3=new MenuItem("Paste");

  WinDemo2(){
    super("PopupMenu");
    setSize(300,200);
    addWindowListener(new WindowAdapter()
    {
       public void widnowClosing(WindowEvent e)
       {
          System.exit(0);
       }
   });
   
   add(ta);
   ta.add(pm);
   pm.add(item1);
   pm.add(item2);
   pm.add(item3);
   item1.addActionListener(this);
   item2.addActionListener(this);
   item3.addActionListener(this);
   ta.addMouseListener(this);
   show();
}

public void actionPerformed(ActionEvent e)
{
   ta.append("You have chosen "+e.getActionCommand()+"\n");
}

public void mouseReleased(MouseEvent e)
{
  if(e.isPopupTrigger())
     pm.show(this,e.getX(),e.getY());
}

public void mouseClicked(MouseEvent e){}
public void mouseEntered(MouseEvent e){}
public void mouseExited(MouseEvent e){}
public void mousePressed(MouseEvent e){}

public static void main(String arg[])
{
   new WinDemo2();
}
}