import java.awt.*;
import java.awt.event.*;

public class Event11Example extends Panel
       implements ActionListener
  {
  public Panel     displayPanel;
  public Button    colorButton;
  public Color[]   colors = {Color.black,
			     Color.red,
			     Color.yellow,
			     Color.green};
  private int	   counter = 0;

  public Event11Example()
    {
    setLayout(new BorderLayout());
    displayPanel = new Panel();
    add("Center", displayPanel);
    colorButton = new Button("Change Color");
    colorButton.addActionListener(this);
    add("South", colorButton);
    }

  public static void main(String[] args)
    {
    Frame baseFrame = new Frame();
    Event11Example ee = new Event11Example();
    baseFrame.add("Center", ee);
    baseFrame.reshape(10,10,200,200);
    baseFrame.setTitle("Event Example");
    baseFrame.show();
    }

  public void actionPerformed(ActionEvent evt)
    {
    displayPanel.setBackground(colors[counter]);
    if (counter <=2)
       counter++;
    else
       counter =0;
    }
  }