/* * A 1.4 application that uses SpringLayout to lay out a grid. * Other files required: SpringUtilities.java */import javax.swing.*;import java.awt.*;public class SpringGrid {    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Create the panel and populate it.        JPanel panel = new JPanel(new SpringLayout());        for (int i = 0; i < 9; i++) {            JTextField textField = new JTextField(Integer.toString(i));            //Make the 4th field extra big.            if (i == 4) {                textField.setText("This one is extra long.");            }            panel.add(textField);        }        //Lay out the panel.        SpringUtilities.makeGrid(panel,                                 3, 3, //rows, cols                                 5, 5, //initialX, initialY                                 5, 5);//xPad, yPad        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("SpringGrid");        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();            }        });    }}