/* * A 1.4 application that uses SpringLayout to create a compact grid. * Other files required: SpringUtilities.java. */import javax.swing.*;import java.awt.*;public class SpringCompactGrid {    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        JPanel panel = new JPanel(new SpringLayout());        int rows = 10;        int cols = 10;        for (int r = 0; r < rows; r++) {            for (int c = 0; c < cols; c++) {                int anInt = (int) Math.pow(r, c);                JTextField textField =                        new JTextField(Integer.toString(anInt));                panel.add(textField);            }        }        //Lay out the panel.        SpringUtilities.makeCompactGrid(panel, //parent                                        rows, cols,                                        3, 3,  //initX, initY                                        3, 3); //xPad, yPad        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("SpringCompactGrid");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Set up the content pane.        panel.setOpaque(true); //content panes must be opaque        frame.setContentPane(panel);        //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();            }        });    }}