/* * GridLayoutDemo.java is a 1.4 application that requires one * other file: *   GraphPaperLayout.java */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));    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("GraphPaperTest");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        JComponent newContentPane = new GraphPaperTest();        newContentPane.setOpaque(true); //content panes must be opaque        frame.setContentPane(newContentPane);        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}