"main program" method - construct and show
final JFrame f = new JFrame("CircleLayout Demonstration");
Container cp = f.getContentPane();
cp.setLayout(new CircleLayout(true));
cp.add(new JButton("One"));
cp.add(new JButton("Two"));
cp.add(new JButton("Three"));
cp.add(new JButton("Four"));
cp.add(new JButton("Five"));
cp.add(new JButton("Six"));
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLocation(200, 200);
f.setVisible(true);
