Java Foundation Classes in a Nutshell

CHAPTER 8

Thejava.applet Package

The java.applet package is a small but important package that defines the Applet

class — the superclass of all applets. It also defines the AppletContext and AppletStub

inter faces, which are implemented by web browsers and other applet viewers.

Finally, for lack of a better place, this package contains the AudioClip inter face,

which repr esents a sound to be played. Figure 8-1 shows the class hierarchy of

this package. See Chapter 7, Applets, for more details about applets.

Component Container Panel Applet

AudioClip

AppletStub

AppletContext

java.appletjava.awtjava.lang

Object

Serializable

java.awt.imagejava.io

ImageObserver

MenuContainer

extends implements

KEY

CLASS

FINAL CLASS

INTERFACE

Figur e 8−1: The java.applet package

Applet Ja va 1.0

java.applet serializable AWT component PJ1.1

This class implements an applet. To create your own applet, you should create a sub-

class of this class and override some or all of the following methods. Note that you

never need to call these methods—they are called when appropriate by a web browser

or other applet viewer.

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init() should perfor m any initialization for the applet; it is called when the applet first

starts. destroy() should free up any resources that the applet is holding; it is called when

the applet is ...