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来自「本压缩文档为《Java大学实用教程》（7-121-00959-5 电子工业出版社」· 代码 · 共 45 行

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*;
class MyWin extends JFrame 
{ 
    JButton button;
    int i=0; 
    Icon icon1,icon2;
    public  MyWin()
    {
      setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      icon1=new ImageIcon("a.jpg");
      icon2=new ImageIcon("b.jpg");
      setBounds(100,100,300,200);
      setVisible(true);
      button=new JButton("按钮",icon1);
      button.setMnemonic('d') ;
      button.setHorizontalTextPosition(AbstractButton.LEFT);
      button.setVerticalTextPosition(AbstractButton.TOP);
      Container con=getContentPane(); 
      con.setLayout(new FlowLayout());
      con.add(button); 
      con.validate();
      button.addActionListener(new ActionListener()
                                   {
                                      public void actionPerformed(ActionEvent e)
                                      {
                                          i=(i+1)%2;
                                          if(i==1)
                                              button.setIcon(icon2); 
                                          else
                                              button.setIcon(icon1);
                                      } 
                                   }
                              );
    }
}
public class Example
{ 
   public static void main(String args[])
   {  
       new MyWin();
   }
}