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

public class clickMe extends Frame implements ActionListener{
  private Button quit=new Button("Quit");
  private Button click=new Button("Click here");
  private TextField text=new TextField(20);
  private boolean secondClick=false;
  
  //定义构造方法
  public clickMe(){
    super("Click Example");
    setLayout(new FlowLayout());
    add(quit);
    add(click);
    add(text);
    quit.addActionListener(this);
    click.addActionListener(this);
    setSize(300,80);
    setVisible(true);
  }
  
  public void actionPerformed(ActionEvent e){
    if(e.getSource()==quit)
      System.exit(0);
    else if(e.getSource()==click){
      if (secondClick)
        text.setText("Not again!");
      else
        text.setText("Uh, it tickles!");
      secondClick = !secondClick;
    }
  }
  public static void main(String args[]){
  	clickMe myFrame=new clickMe();
  }
}