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java.lang.Object
|
+----java.awt.Component
|
+----java.awt.Container
|
+----java.awt.Panel
|
+----java.applet.Applet
The Applet class must be the superclass of any
applet that is to be embedded in a Web page or viewed by the Java
Applet Viewer. The Applet class provides a standard
interface between applets and their environment.
Applet()
destroy()
getAppletContext()
getAppletInfo()
getAudioClip(URL)
AudioClip object specified by the
URL argument.
getAudioClip(URL, String)
AudioClip object specified by the
URL and name arguments.
getCodeBase()
getDocumentBase()
getImage(URL)
Image object that can then be painted on
the screen.
getImage(URL, String)
Image object that can then be painted on
the screen.
getLocale()
getParameter(String)
getParameterInfo()
init()
isActive()
play(URL)
play(URL, String)
resize(Dimension)
resize(int, int)
setStub(AppletStub)
showStatus(String)
start()
stop()
Applet
public Applet()
setStub
public final void setStub(AppletStub stub)
isActive
public boolean isActive()
start method is called. It becomes
inactive immediately after its stop method is called.
true if the applet is active;
false otherwise.
getDocumentBase
public URL getDocumentBase()
URL of
the document that contains this applet.
getCodeBase
public URL getCodeBase()
URL of
this applet.
getParameter
public String getParameter(String name)
<applet code="Clock" width=50 height=50>
<param name=Color value="blue">
</applet>
then a call to getParameter("Color") returns the
value "blue".
The name argument is case insensitive.
getAppletContext
public AppletContext getAppletContext()
This environment of an applet represents the document that contains the applet.
resize
public void resize(int width,
int height)
resize
public void resize(Dimension d)
showStatus
public void showStatus(String msg)
getImage
public Image getImage(URL url)
Image object that can then be painted on
the screen. The url that is passed as an argument
must specify an absolute URL.
This method always returns immediately, whether or not the image exists. When this applet attempts to draw the image on the screen, the data will be loaded. The graphics primitives that draw the image will incrementally paint on the screen.
getImage
public Image getImage(URL url,
String name)
Image object that can then be painted on
the screen. The url argument must specify an absolute
URL. The name argument is a specifier that is
relative to the url argument.
This method always returns immediately, whether or not the image exists. When this applet attempts to draw the image on the screen, the data will be loaded. The graphics primitives that draw the image will incrementally paint on the screen.
url argument.
getAudioClip
public AudioClip getAudioClip(URL url)
AudioClip object specified by the
URL argument.
This method always returns immediately, whether or not the audio clip exists. When this applet attempts to play the audio clip, the data will be loaded.
getAudioClip
public AudioClip getAudioClip(URL url,
String name)
AudioClip object specified by the
URL and name arguments.
This method always returns immediately, whether or not the audio clip exists. When this applet attempts to play the audio clip, the data will be loaded.
url argument.
getAppletInfo
public String getAppletInfo()
String containing information
about the author, version, and copyright of the applet.
The implementation of this method provided by the
Applet class returns null.
getLocale
public Locale getLocale()
getParameterInfo
public String[][] getParameterInfo()
Strings describing these parameters.
Each element of the array should be a set of three
Strings containing the name, the type, and a
description. For example:
String pinfo[][] = {
{"fps", "1-10", "frames per second"},
{"repeat", "boolean", "repeat image loop"},
{"imgs", "url", "images directory"}
};
The implementation of this method provided by the
Applet class returns null.
play
public void play(URL url)
play
public void play(URL url,
String name)
url argument.
init
public void init()
start method is
called.
A subclass of Applet should override this method if
it has initialization to perform. For example, an applet with
threads would use the init method to create the
threads and the destroy method to kill them.
The implementation of this method provided by the
Applet class does nothing.
start
public void start()
init method and each time the applet is revisited
in a Web page.
A subclass of Applet should override this method if
it has any operation that it wants to perform each time the Web
page containing it is visited. For example, an applet with
animation might want to use the start method to
resume animation, and the stop method to suspend the
animation.
The implementation of this method provided by the
Applet class does nothing.
stop
public void stop()
A subclass of Applet should override this method if
it has any operation that it wants to perform each time the Web
page containing it is no longer visible. For example, an applet
with animation might want to use the start method to
resume animation, and the stop method to suspend the
animation.
The implementation of this method provided by the
Applet class does nothing.
destroy
public void destroy()
stop method
will always be called before destroy.
A subclass of Applet should override this method if
it has any operation that it wants to perform before it is
destroyed. For example, an applet with threads would use the
init method to create the threads and the
destroy method to kill them.
The implementation of this method provided by the
Applet class does nothing.
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