In that manner, you can't. Create an image that you can create an ImageIcon from to set as the button lable (see the API docs for JButton) and create a Sound file and use a MouseListener to play it with the MouseEntered event (See the Swing tutorials).
Java Programmer and Sun Systems Administrator
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan