Exercise Nine

Exercise Nine

• Okay, let's make our simple example from last exercise handle events using the 1.1 methodology:
  

  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;
      }
    }
  

Additional Resources:

• Learning to Write Java
• Introducing Java (TM) - Your First Applet
• Java FAQs
• Java Software
• java.sun.com
• Sun Microsystems

Beans Event Listeners
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Adapters