Exercise Eight 

import java.awt.*;

public class EventExample extends Panel
  {
  public Panel     displayPanel;
  public Button    colorButton;
  public Color[]   colors = {Color.black, 
                             Color.red, 
                             Color.yellow,
                             Color.green};
  private int      counter = 0;

  public EventExample()
    {
    setLayout(new BorderLayout());
    displayPanel = new Panel();
    add("Center", displayPanel);
    colorButton = new Button("Change Color");
    add("South", colorButton);
    }

  public static void main(String[] args)
    {
    Frame baseFrame = new Frame();
    EventExample ee = new EventExample();
    baseFrame.add("Center", ee);
    baseFrame.reshape(10,10,200,200);
    baseFrame.setTitle("Event Example");
    baseFrame.show();
    }

  public boolean action(Event evt, Object obj)
    {
    displayPanel.setBackground(colors[counter]);
    if (counter <=2)     
       counter++;
    else
       counter =0;
    return super.action(evt, obj);
    }
  }