Ejuemplo Java Desplazamiento : AdjustmentListener Scrollbar adjustmentValueChanged(AdjustmentEvent e)

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
/*
<APPLET
    CODE=desplazamientoenborde.class
    WIDTH=200
    HEIGHT=200 >
</APPLET>
*/
public class desplazamientoenborde extends Applet implements AdjustmentListener
{
    Scrollbar hScroll1, hScroll2, vScroll1, vScroll2;
    TextPanel t1;
    public void init()
    {
        setLayout(new BorderLayout());
        hScroll1 = new Scrollbar(Scrollbar.HORIZONTAL, 1, 1, 1, 100);
        add("North", hScroll1);
        hScroll1.addAdjustmentListener(this);
        vScroll1 = new Scrollbar(Scrollbar.VERTICAL, 1, 1, 1, 100);
        add("West", vScroll1);
        vScroll1.addAdjustmentListener(this);
        hScroll2 = new Scrollbar(Scrollbar.HORIZONTAL, 1, 1, 1, 100);
        add("South", hScroll2);
        hScroll2.addAdjustmentListener(this);
        vScroll2 = new Scrollbar(Scrollbar.VERTICAL, 1, 1, 1, 100);
        add("East", vScroll2);
        vScroll2.addAdjustmentListener(this);
        t1 = new TextPanel();
        add("Center", t1);
    }
    public void adjustmentValueChanged(AdjustmentEvent e)
    {
        if(e.getAdjustable() == hScroll1){
            hScroll2.setValue(hScroll1.getValue());
        }
        if(e.getAdjustable() == vScroll1){
            vScroll2.setValue(vScroll1.getValue());
        }
        if(e.getAdjustable() == hScroll2){
            hScroll1.setValue(hScroll2.getValue());
        }
        if(e.getAdjustable() == vScroll2){
            vScroll1.setValue(vScroll2.getValue());
        }
        t1.x = (int) (getSize().width * (float) hScroll1.getValue() / 100);
        t1.y = (int) (getSize().height * (float) vScroll1.getValue() / 100);
        t1.repaint();
    }
}
class TextPanel extends Panel
{
    TextField Text1;
    public int x = 0, y = 0;
    public void paint (Graphics g)
    {
        g.drawString("¡Hola desde Java!", x, y);
    }
}