java.applet
Class Applet

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Panel
                    |
                    +--
      
java.applet.Applet
    

public class Applet

extends java.awt.Panel

An applet is a small program that is intended not to be run on its own, but rather to be embedded inside another application.

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.

Since:

JDK1.0

See Also:

Serialized Form

Source Code:

Applet.java

Applet

public  
      
Applet()
    

Method Detail

setStub

public final void  
      
setStub(
      
AppletStub stub)
    

Sets this applet's stub. This is done automatically by the system.

Parameters:

stub - the new stub.

---

isActive

public boolean  
      
isActive()
    

Determines if this applet is active. An applet is marked active just before its start method is called. It becomes inactive just before its stop method is called.

Returns:

true if the applet is active; false otherwise.

See Also:

start() , stop()

---

getDocumentBase

public java.net.URL  
      
getDocumentBase()
    

Gets the document URL. This is the URL of the document in which the applet is embedded.

Returns:

the URL#_top_ of the document that contains this applet.

See Also:

getCodeBase()

---

getCodeBase

public java.net.URL  
      
getCodeBase()
    

Gets the base URL. This is the URL of the applet itself.

Returns:

the URL#_top_ of this applet.

See Also:

getDocumentBase()

---

getParameter

public java.lang.String  
      
getParameter(java.lang.String name)
    

Returns the value of the named parameter in the HTML tag. For example, if this applet is specified as

 <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.

Parameters:

name - a parameter name.

Returns:

the value of the named parameter.

---

getAppletContext

public  
      
AppletContext  
      
getAppletContext()
    

Determines this applet's context, which allows the applet to query and affect the environment in which it runs.

This environment of an applet represents the document that contains the applet.

Returns:

the applet's context.

---

resize

public void  
      
resize(int width,
                   int height)
    

Requests that this applet be resized.

Parameters:

width - the new requested width for the applet.

height - the new requested height for the applet.

Overrides:

resize in class java.awt.Component

---

resize

public void  
      
resize(java.awt.Dimension d)
    

Requests that this applet be resized.

Parameters:

d - an object giving the new width and height.

Overrides:

resize in class java.awt.Component

---

showStatus

public void  
      
showStatus(java.lang.String msg)
    

Requests that the argument string be displayed in the "status window". Many browsers and applet viewers provide such a window, where the application can inform users of its current state.

Parameters:

msg - a string to display in the status window.

---

getImage

public java.awt.Image  
      
getImage(java.net.URL url)
    

Returns an 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.

Parameters:

url - an absolute URL giving the location of the image.

Returns:

the image at the specified URL.

See Also:

Image

---

getImage

public java.awt.Image  
      
getImage(java.net.URL url,
                               java.lang.String name)
    

Returns an 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.

Parameters:

url - an absolute URL giving the base location of the image.

name - the location of the image, relative to the url argument.

Returns:

the image at the specified URL.

See Also:

Image

---

newAudioClip

public static final  
      
AudioClip  
      
newAudioClip(java.net.URL url)
    

Get an audio clip from the given URL

Parameters:

url - Points to the audio clip

Since:

JDK1.2

---

getAudioClip

public  
      
AudioClip  
      
getAudioClip(java.net.URL url)
    

Returns the 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.

Parameters:

url - an absolute URL giving the location of the audio clip.

Returns:

the audio clip at the specified URL.

See Also:

AudioClip

---

getAudioClip

public  
      
AudioClip  
      
getAudioClip(java.net.URL url,
                              java.lang.String name)
    

Returns the 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.

Parameters:

url - an absolute URL giving the base location of the audio clip.

name - the location of the audio clip, relative to the url argument.

Returns:

the audio clip at the specified URL.

See Also:

AudioClip

---

getAppletInfo

public java.lang.String  
      
getAppletInfo()
    

Returns information about this applet. An applet should override this method to return a String containing information about the author, version, and copyright of the applet.

The implementation of this method provided by the Applet class returns null.

Returns:

a string containing information about the author, version, and copyright of the applet.

---

getLocale

public java.util.Locale  
      
getLocale()
    

Gets the Locale for the applet, if it has been set. If no Locale has been set, then the default Locale is returned.

Returns:

the Locale for the applet

Overrides:

getLocale in class java.awt.Component

Since:

JDK1.1

---

getParameterInfo

public java.lang.String[][]  
      
getParameterInfo()
    

Returns information about the parameters than are understood by this applet. An applet should override this method to return an array of 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.

Returns:

an array describing the parameters this applet looks for.

---

play

public void  
      
play(java.net.URL url)
    

Plays the audio clip at the specified absolute URL. Nothing happens if the audio clip cannot be found.

Parameters:

url - an absolute URL giving the location of the audio clip.

---

play

public void  
      
play(java.net.URL url,
                 java.lang.String name)
    

Plays the audio clip given the URL and a specifier that is relative to it. Nothing happens if the audio clip cannot be found.

Parameters:

url - an absolute URL giving the base location of the audio clip.

name - the location of the audio clip, relative to the url argument.

---

init

public void  
      
init()
    

Called by the browser or applet viewer to inform this applet that it has been loaded into the system. It is always called before the first time that the 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.

See Also:

destroy() , start() , stop()

---

start

public void  
      
start()
    

Called by the browser or applet viewer to inform this applet that it should start its execution. It is called after the 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.

See Also:

destroy() , init() , stop()

---

stop

public void  
      
stop()
    

Called by the browser or applet viewer to inform this applet that it should stop its execution. It is called when the Web page that contains this applet has been replaced by another page, and also just before the applet is to be destroyed.

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.

See Also:

destroy() , init()

---

destroy

public void  
      
destroy()
    

Called by the browser or applet viewer to inform this applet that it is being reclaimed and that it should destroy any resources that it has allocated. The 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.

See Also:

init() , start() , stop()

---

Package     Class   Tree   Deprecated   Index   Help
PREV CLASS   NEXT CLASS	FRAMES     NO FRAMES
SUMMARY:  INNER |  FIELD |  CONSTR |  METHOD	DETAIL:  FIELD |  CONSTR |  METHOD

---