import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class RoundButton extends JButton
{
    public RoundButton(String label)
    {
    	super(label);
    	Dimension size = getPreferredSize();
    	size.width = size.height = Math.max(size.width, size.height);
    	setPreferredSize(size);
    	setContentAreaFilled(false);
    }
    protected void paintComponent(Graphics g)
    {
    	if(getModel().isArmed())
    	{
    		g.setColor(Color.lightGray);
    	}
    	else
    	{
    		g.setColor(getBackground());
    	}
    	g.fillRect(0,0,getSize().width - 1, getSize().height - 1);
    	super.paintComponent(g);
    }
    protected void paintBorder(Graphics g)
    {
    	g.setColor(getForeground());
    	g.drawRect(0,0,getSize().width-1, getSize().height-1);
    }
    Shape shape;
    public boolean contains(int x, int y)
    {
    	if(shape == null || !shape.getBounds().equals(getBounds()))
    	{
    		shape = new Ellipse2D.Float(0,0,getWidth(), getHeight());
    	}
    	return shape.contains(x, y);
    }
    public static void main(String[] args) 
    {
		JButton button = new RoundButton("Jackpot");
		button.setBackground(Color.green);
		JFrame frame = new JFrame();
		frame.getContentPane().setBackground(Color.yellow);
		frame.getContentPane().add(button);
		frame.getContentPane().setLayout(new FlowLayout());
		frame.setSize(150, 150);
		frame.setVisible(true);
    }
}