package java2d;import java.awt.BorderLayout;import java.awt.GridBagLayout;import javax.swing.JPanel;import javax.swing.border.*;import javax.swing.event.ChangeEvent;import javax.swing.event.ChangeListener;/** * Panel that holds the Demo groups, Controls and Monitors for each tab. * It's a special "always visible" panel for the Controls, MemoryMonitor & * PerformanceMonitor. */public class GlobalPanel extends JPanel implements ChangeListener {    private JPanel p;    private int index;    public GlobalPanel() {        setLayout(new BorderLayout());        // p = new JPanel(new GridBagLayout());        p = new JPanel(new GridBagLayout());        EmptyBorder eb = new EmptyBorder(5, 0, 5, 5);        BevelBorder bb = new BevelBorder(BevelBorder.LOWERED);        p.setBorder(new CompoundBorder(eb, bb));        Java2Demo.addToGridBag(p, Java2Demo.controls, 0, 0, 1, 1, 0, 0);        //Java2Demo.addToGridBag(p,Java2Demo.memorymonitor,0,1,1,1,0,0);        Java2Demo.addToGridBag(p, Java2Demo.performancemonitor, 0, 1, 1, 1, 0,                               0);        add(Java2Demo.intro);    }    public void stateChanged(ChangeEvent e) {        // Java2Demo.group[index].shutDown(Java2Demo.group[index].getPanel());        if (Java2Demo.tabbedPane.getSelectedIndex() == 0) {            Java2Demo.memorymonitor.surf.stop();            Java2Demo.performancemonitor.surf.stop();            Java2Demo.controls.surf.stop();            removeAll();            add(Java2Demo.intro);            Java2Demo.intro.start();        } else {            //            if (getComponentCount() == 1) {                Java2Demo.intro.stop();                remove(Java2Demo.intro);                add(p, BorderLayout.EAST);                Java2Demo.memorymonitor.surf.start();                Java2Demo.performancemonitor.surf.start();                Java2Demo.controls.surf.start();            } else {                remove(Java2Demo.group[index]);            }            index = Java2Demo.tabbedPane.getSelectedIndex() - 1;            add(Java2Demo.group[index]);            Java2Demo.group[index].setup(false);        }        validate();    }}