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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.
AudioClip
object specified by the
URL
argument.
AudioClip
object specified by the
URL
and name
arguments.
Image
object that can then be painted on
the screen.
Image
object that can then be painted on
the screen.
public Applet()
public final void setStub(AppletStub stub)
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.
public URL getDocumentBase()
URL
of
the document that contains this applet.
public URL getCodeBase()
URL
of
this applet.
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.
public AppletContext getAppletContext()
This environment of an applet represents the document that contains the applet.
public void resize(int width, int height)
public void resize(Dimension d)
public void showStatus(String msg)
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.
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.
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.
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.
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
.
public Locale getLocale()
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
.
public void play(URL url)
public void play(URL url, String name)
url
argument.
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.
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.
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.
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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