/* * BoxLayoutDemo.java is a 1.4 application that requires no other files. */import java.awt.Component;import java.awt.Container;import javax.swing.BoxLayout;import javax.swing.JButton;import javax.swing.JFrame;public class BoxLayoutDemo {    public static void addComponentsToPane(Container pane) {        pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS));        addAButton("Button 1", pane);        addAButton("Button 2", pane);        addAButton("Button 3", pane);        addAButton("Long-Named Button 4", pane);        addAButton("5", pane);    }    private static void addAButton(String text, Container container) {        JButton button = new JButton(text);        button.setAlignmentX(Component.CENTER_ALIGNMENT);        container.add(button);    }    /**     * 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("BoxLayoutDemo");        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();            }        });    }}