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60

Chapter 2 First Servlets

CloseableFrame

CloseableFrame

 is an extension of the standard 

Frame

 class, with the addi 

tion that user requests to quit the frame are honored. This is the top level

window on which 

WebClient

 is built. 

Listing 2.16 CloseableFrame.java 

import java.awt.*;

import java.awt.event.*;

/** A Frame that you can actually quit. Used as

 *  the starting point for most Java 1.1 graphical

 *  applications.

 */

public class CloseableFrame extends Frame {

  public CloseableFrame(String title) {

    super(title);

    enableEvents(AWTEvent.WINDOW_EVENT_MASK);

  }

  /** Since we are doing something permanent, we need

   *  to call super.processWindowEvent first.

   */

  public void processWindowEvent(WindowEvent event) {

    super.processWindowEvent(event); // Handle listeners

    if (event.getID() == WindowEvent.WINDOW_CLOSING)

      System.exit(0);

  }

}

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