import java.applet.Applet;
import java.awt.Scrollbar;
import java.awt.Graphics;
import java.awt.event.AdjustmentListener;
import java.awt.event.AdjustmentEvent;
public class BarraApplet extends Applet implements AdjustmentListener {
  private Scrollbar laBarra; 
  private int elValor;
  public void init() {
     laBarra = new Scrollbar(Scrollbar.VERTICAL,0,1,0,100);
     add(laBarra);
     laBarra.addAdjustmentListener(this);
  }
  public void adjustmentValueChanged(AdjustmentEvent elEvento) {
     elValor= laBarra.getValue();
     repaint();
  }
  public void paint(Graphics elGrafico) {
     elGrafico.drawRect(40,80,60,100);
     elGrafico.fillRect(40,80,60,elValor);
  }
}