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Class test.jcsp.ButtonTest

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----java.applet.Applet
                                   |
                                   +----jcsp.awt.ActiveApplet
                                           |
                                           +----test.jcsp.ButtonTest

public class ButtonTest

extends ActiveApplet

implements ItemListener

Applet

Process Diagram

External View

  ______________
 |              |
 |  ButtonTest  |
 |______________|
 

Internal View

  _____________________________________
 |  ___________________                |
 | |                   |               |
 | | Java Event Thread |               |
 | |___________________|               |
 |         |                           |
 |         v configure                 |
 |  _______|______         __________  |
 | |              | event |          | |
 | | ActiveButton |--->---|          | |
 | |______________|       |__________| |
 |                                     |
 |                          ButtonTest |
 |_____________________________________|
 

Description

The anonymous process has an infinite loop which reads one object from the event Channel and upon receiving the Object increases a counter and then displays this count on a Label.

NOTE: The Java Event thread is a process which is created by the Java runtime environment and calls the itemStateChanged method when one of the components the Applet is listening to generates an ItemEvent.

The purpose of this test is to check to see if the events are notified correctly and that the configuration functions correctly.

NOTE: The code for this Applet is not a good example of developing programs using the library, it has been designed to allow the component to be tested without depending on more classes from the library than is necessary.

Author:

P.D.Austin

ButtonTest()

getAppletInfo()

returns the name and author of the Applet.

init()

Initialises the Applet.

itemStateChanged(ItemEvent)

Handles ItemEvents generated by components this class is listening to.

 public ButtonTest()

 public void init()

Initialises the Applet.

Overrides:

init in class Applet

 public void itemStateChanged(ItemEvent e)

Handles ItemEvents generated by components this class is listening to.

Parameters:

e - The ItemEvent to be processed

 public String getAppletInfo()

returns the name and author of the Applet.

Overrides:

getAppletInfo in class Applet

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