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Introduction to Web Programming
Exercise Eight  
  • Okay, let's try a simple example of using events. Try to create a program which will respond to button events. In the following example, a panel is colored differently each time the user clicks the button:


    import java.awt.*;
    public class EventExample extends Panel
      public Panel     displayPanel;
      public Button    colorButton;
      public Color[]   colors = {Color.black,
    			     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.setTitle("Event Example");
      public boolean action(Event evt, Object obj)
        if (counter <=2)
           counter =0;
        return super.action(evt, obj);

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