import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class example extends JApplet implements ActionListener {
  Container cp; 
  JButton bt1,bt2;
  JLabel lb;
  Panel pa1;
  public void init(){
  cp=getContentPane();
  pa1=new Panel();
  bt1=new JButton("確定");
  bt2=new JButton("退出");
  lb=new JLabel("Java",JLabel.LEFT);
  pa1.add(bt1);pa1.add(bt2); 
  cp.add(lb,BorderLayout.NORTH);
  cp.add(pa1,BorderLayout.SOUTH);
  bt1.addActionListener(this);
  bt2.addActionListener(this);}
  public void actionPerformed(ActionEvent e){
   if(e.getSource()==bt1){
    if(bt1.getText()=="確定")
       lb.setText("你好");}
   else
    if(e.getSource()==bt2){
       if(bt2.getText()=="退出")
       lb.setText("再見");                  
       }       
     }
}