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

public class RoundButton extends JButton {
	
	public RoundButton( String label )
	{
		super( label );
		Dimension size = getPreferredSize();
		setPreferredSize( size );
		setContentAreaFilled( false );

	}

	protected void paintComponent( Graphics g )
	{
		if ( getModel().isArmed() )
			g.setColor( Color.lightGray );
		else 
			g.setColor( getBackground() );
		
		g.fillOval( 0, 0, getSize().width - 1,getSize().height - 1 );
		super.paintComponent( g );
	}

	protected void paintBorder( Graphics g )
	{
		g.setColor( getForeground() );
		g.drawOval( 0, 0, getSize().width - 1, getSize().height - 1 );
	}
	

	public static void main( String args[] )
	{
		JButton button = new RoundButton( "Test" );
		JFrame frame = new JFrame();
		frame.getContentPane().add( button );
		frame.setSize( 400, 300 );
		frame.setVisible( true );

		frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
	}
}