极菜问题：在JButton上加Icon

Question

hehe~~java是不认.ico的,要用.gif格式的图片

Answer 1

import javax.swing.*;import java.awt.*;import java.awt.event.*;
class Mywindow extends JFrame implements ActionListener
{ JButton button1,button2,button3;JTextArea text;Icon icon;
   Mywindow()
   {setSize(200,200);setVisible(true);
    Container con=getContentPane();
    text=new JTextArea(); 
    con.setLayout(new GridLayout(1,4)); 
    icon=new ImageIcon("tom.jpg");
    button1=new JButton("Boy",icon); button2=new JButton("Girl");
    button3=new JButton("friend",new ImageIcon("tom1.jpg"));
    button1.setVerticalTextPosition(AbstractButton.TOP);
    button1.setMnemonic('b'); 
    con.add(button1);con.add(button2);con.add(button3);con.add(text);
    button1.addActionListener(this);button3.addActionListener(this);
    addWindowListener(new WindowAdapter()
      {public void windowClosing(WindowEvent e)
        {System.exit(0);}});
   }
  public void actionPerformed(ActionEvent e)
  {if(e.getSource()==button1)
    { text.setText(button1.getText()+button2.getText());
      button2.setIcon(button1.getIcon());
      button2.setHorizontalTextPosition(AbstractButton.RIGHT);button3.setEnabled(false);
    }
  else if(e.getSource()==button3)
    { text.append(button3.getText()); button2.setIcon(button3.getIcon());
     }
  }
}
public class Example25_10
{ public static void main(String args[])
  { Mywindow win=new Mywindow();win.pack();
  }
}
在java中是这么用的