clickme.java

来自「java语言与面向对象程序设计源程序」· Java 代码 · 共 40 行

//<applet code=ClickMe.class width=200 height=80>
//</applet>
//appletviewer .java

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class ClickMe extends Applet implements ActionListener
    {  // 域声明
   private Button quit = new Button("Quit");
   private Button click = new Button("Click here");
   private TextField text = new TextField(10);
   private boolean secondClick = false;
   // 方法声明
   public void init()
   {  setLayout(new FlowLayout());
      add(quit);
      add(click);
      add(text);
      quit.addActionListener(this);
      click.addActionListener(this);
   }
   public void start()
       {  text.setText("Applet started"); }
   public void stop()
       {  text.setText("Applet stopped"); }
   public void actionPerformed(ActionEvent e)
   {  if (e.getSource() == quit)
         text.setText("Can not quit applets");
      else if (e.getSource() == click)
      {  if (secondClick)
            text.setText("not again !");
         else
            text.setText("Uh,it tickles");
         secondClick = !secondClick;
      }
   }
}