How to scale an image displayed on JButton

Hi all,
I has a panel contains 42 buttons of the same size arranged with GridLayout manager. I try to display some images on the buttons. But the problem is that the image bigger than buttons. Is it possible to scale the image to fit the size of button and which method is used?
Thank you very much in advance.

Hi,
I try your tips. But I still see no changes.
here is the code. I wonder where I go wrong.
                Image i=Toolkit.getDefaultToolkit().getImage("red.JPEG");                    i.getScaledInstance(-5,5,Image.SCALE_DEFAULT);
                //or i.getScaledInstance(10,1,Image.SCALE_DEFAULT);
     ImageIcon ic=new ImageIcon(i);
               button1.setIcon(ic);//add image to the button

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