clickme.java

java程序设计 清华出版社 孙燮华老师编写的程序源代码

//ClickMe.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(20);
  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 applet!");
    else if(e.getSource()==click){
      if (secondClick)
        text.setText("Not again!");
      else
        text.setText("Uh, it tickles!");
      secondClick = !secondClick;
    }
  }
}