framedemo.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.*;
import java.awt.geom.*;

public class FrameDemo extends Frame
   {
    static Button  bt1=new Button("Display"),
  bt2=new Button("Exit");
    Label lb=new Label("****This is a frame!****");
    Frame ko=new Frame();
    Canvas c=new Canvas();
    koActionListener koListener=new koActionListener(ko);
    public FrameDemo()
{
super("FrameDemo");
c.setBackground(Color.red);
c.setSize(150,120);
setSize(200,180);
setVisible(true);
add(c);
addWindowListener(new koWindowListener());
}
 class koWindowListener extends WindowAdapter
{
public void windowClosing(WindowEvent e)
   {
     e.getWindow().dispose();
     System.exit(0);
    }
}
   class koActionListener implements ActionListener
{
public koActionListener(Frame f)
   {
    ko=f;
    }
public void actionPerformed(ActionEvent e)
    {
    if (e.getSource()==bt1)
      { 
ko.setLayout(new FlowLayout());
ko.add(lb);
        ko.setSize(200,180);
        ko.setVisible(true);
       }
      else if (e.getSource()==bt2)
      ko.setVisible(false);
    }
}
   public static void main(String args[])
{
FrameDemo k=new FrameDemo();
k.ko.setBackground(Color.green);
k.ko.setLayout(new FlowLayout());
k.ko.add(bt1);
k.ko.add(bt2);
k.ko.setSize(200,180);
k.ko.setVisible(true);
bt1.addActionListener(k.koListener);
bt2.addActionListener(k.koListener);
}
  }