/* * GridBagLayoutDemo.java is a 1.4 application that requires no other files. */import java.awt.*;import javax.swing.JButton;import javax.swing.JFrame;public class GridBagLayoutDemo {    final static boolean shouldFill = true;    final static boolean shouldWeightX = true;    final static boolean RIGHT_TO_LEFT = false;    public static void addComponentsToPane(Container pane) {        if (RIGHT_TO_LEFT) {            pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);        }        JButton button;        pane.setLayout(new GridBagLayout());        GridBagConstraints c = new GridBagConstraints();        if (shouldFill) {            //natural height, maximum width            c.fill = GridBagConstraints.HORIZONTAL;        }        button = new JButton("Button 1");        if (shouldWeightX) {            c.weightx = 0.5;        }        c.gridx = 0;        c.gridy = 0;        pane.add(button, c);        button = new JButton("Button 2");        c.gridx = 1;        c.gridy = 0;        pane.add(button, c);        button = new JButton("Button 3");        c.gridx = 2;        c.gridy = 0;        pane.add(button, c);        button = new JButton("Long-Named Button 4");        c.ipady = 40;      //make this component tall        c.weightx = 0.0;        c.gridwidth = 3;        c.gridx = 0;        c.gridy = 1;        pane.add(button, c);        button = new JButton("5");        c.ipady = 0;       //reset to default        c.weighty = 1.0;   //request any extra vertical space        c.anchor = GridBagConstraints.PAGE_END; //bottom of space        c.insets = new Insets(10,0,0,0);  //top padding        c.gridx = 1;       //aligned with button 2        c.gridwidth = 2;   //2 columns wide        c.gridy = 2;       //third row        pane.add(button, c);    }    /**     * 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("GridBagLayoutDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Set up the content pane.        addComponentsToPane(frame.getContentPane());        //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();            }        });    }}