import javax.swing.*;import java.awt.*;import java.awt.event.*;public class GraphPaperTest extends JPanel {    public GraphPaperTest() {        setLayout(new GraphPaperLayout(new Dimension(5,5)));        // Add a 1x1 Rect at (0,0)        add(new JButton("1"), new Rectangle(0,0,1,1));        // Add a 2x1 Rect at (2,0)        add(new JButton("2"), new Rectangle(2,0,2,1));        // Add a 1x2 Rect at (1,1)        add(new JButton("3"), new Rectangle(1,1,1,2));        // Add a 2x2 Rect at (3,2)        add(new JButton("4"), new Rectangle(3,2,2,2));        // Add a 1x1 Rect at (0,4)        add(new JButton("5"), new Rectangle(0,4,1,1));        // Add a 1x2 Rect at (2,3)        add(new JButton("6"), new Rectangle(2,3,1,2));    }    public static void main(String[] args) {	JFrame f = new JFrame("GraphPaperTest");	f.addWindowListener(new WindowAdapter() {	    public void windowClosing(WindowEvent e) {		System.exit(0);	    }	});	f.getContentPane().add(new GraphPaperTest(),	                       BorderLayout.CENTER);	f.pack();	f.setVisible(true);    }}