windemo1.java

这是《Java 2 简明教程(第2版)》一书配套的源代码。

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

public class WinDemo1 extends Frame implements ActionListener,ItemListener
{
  TextField tf=new TextField();
  MenuBar mb=new MenuBar();
  Menu m1=new Menu("Edit");
  Menu m2=new Menu("Paste");
  MenuItem copy=new MenuItem("Copy");
  MenuItem cut=new MenuItem("Cut",new MenuShortcut('x'));
  CheckboxMenuItem checkbox=new CheckboxMenuItem("Find");
  MenuItem exit=new MenuItem("Exit");
  
  WinDemo1(){
     super("Window");
     setSize(350,200);
     add(tf);
     mb.add(m1);
     m1.add(m2);
     checkbox.setState(true);
     
     m1.add(copy);
     m1.add(cut);
     m1.addSeparator();
     m1.add(checkbox);
     m1.add(exit);
     exit.addActionListener(this);
     m2.add("Paste All");
     m2.add("Paste Part");
     copy.addActionListener(this);
     checkbox.addActionListener(this);
     exit.addActionListener(this);

     setMenuBar(mb);
     show();
   }

 public static void main(String args[])
 {
    new WinDemo1();
 }

 public void actionPerformed(ActionEvent e)
 {
   if(e.getActionCommand()=="exit")
      System.exit(0);
   else
      tf.setText(e.getActionCommand()+"have been done");
  }
 public void itemStateChanged(ItemEvent e)
 {
   if(e.getSource()==checkbox)
     if(checkbox.getState())
       tf.setText(checkbox.getLabel()+"have been chosen");
      else
        tf.setText(checkbox.getLabel()+"have been cancel");
  }
}