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Showing content from https://docs.oracle.com/en/java/javase/19/docs/api/java.desktop/java/awt/../applet/Applet.html below:

Applet (Java SE 19 & JDK 19)

All Implemented Interfaces:

ImageObserver, MenuContainer, Serializable, Accessible

Direct Known Subclasses:

JApplet

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:

1.0

See Also:

• Serialized Form

• Nested Class Summary

  Nested Classes

  protected class 

  Deprecated, for removal: This API element is subject to removal in a future version.

  This class implements accessibility support for the Applet class.

• Field Summary
• Constructor Summary

  Constructors

  Deprecated, for removal: This API element is subject to removal in a future version.

  Constructs a new Applet.

• Method Summary

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  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.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Gets the AccessibleContext associated with this Applet.

  Deprecated, for removal: This API element is subject to removal in a future version.

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

  Deprecated, for removal: This API element is subject to removal in a future version.

  Returns information about this applet.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Returns the AudioClip object specified by the URL argument.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Returns the AudioClip object specified by the URL and name arguments.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Gets the base URL.

  Deprecated, for removal: This API element is subject to removal in a future version.

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

  Deprecated, for removal: This API element is subject to removal in a future version.

  Returns an Image object that can then be painted on the screen.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Returns an Image object that can then be painted on the screen.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Gets the locale of the applet.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Returns the value of the named parameter in the HTML tag.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Returns information about the parameters that are understood by this applet.

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Called by the browser or applet viewer to inform this applet that it has been loaded into the system.

  boolean

  Deprecated, for removal: This API element is subject to removal in a future version.

  Determines if this applet is active.

  boolean

  Deprecated, for removal: This API element is subject to removal in a future version.

  Indicates if this container is a validate root.

  Deprecated, for removal: This API element is subject to removal in a future version.

  Get an audio clip from the given URL.

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Plays the audio clip at the specified absolute URL.

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Plays the audio clip given the URL and a specifier that is relative to it.

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Requests that this applet be resized.

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Requests that this applet be resized.

  final void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Sets this applet's stub.

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Requests that the argument string be displayed in the "status window".

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

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

  void

  Deprecated, for removal: This API element is subject to removal in a future version.

  Called by the browser or applet viewer to inform this applet that it should stop its execution.

  Methods declared in class java.awt.Containeradd, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getInsets, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusDownCycle, update, validate, validateTree Methods declared in class java.awt.Componentaction, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, reshape, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setMixingCutoutShape, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

• Constructor Details
  • Applet

    Deprecated, for removal: This API element is subject to removal in a future version.

    Note: Many methods in java.applet.Applet may be invoked by the applet only after the applet is fully constructed; applet should avoid calling methods in java.applet.Applet in the constructor.

    Throws:

    HeadlessException - if GraphicsEnvironment.isHeadless() returns true

    Since:

    1.4

    See Also:

    • GraphicsEnvironment.isHeadless()

• Method Details
  • setStub

    Deprecated, for removal: This API element is subject to removal in a future version.

    If there is a security manager, its checkPermission method is called with the AWTPermission("setAppletStub") permission if a stub has already been set.

    Parameters:

    stub - the new stub

    Throws:

    SecurityException - if the caller cannot set the stub

  • isActive

    public boolean isActive()

    Deprecated, for removal: This API element is subject to removal in a future version.

    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 URL getDocumentBase

    ()

    Deprecated, for removal: This API element is subject to removal in a future version.

    Gets the

    URL

    of the document in which this applet is embedded. For example, suppose an applet is contained within the document:

        http://www.oracle.com/technetwork/java/index.html
     

    The document base is:

        http://www.oracle.com/technetwork/java/index.html
     

    Returns:

    the URL of the document that contains this applet

    See Also:

    • getCodeBase()

  • getCodeBase public URL getCodeBase

    ()

    Deprecated, for removal: This API element is subject to removal in a future version.

    Gets the base URL. This is the URL of the directory which contains this applet.

    Returns:

    the base URL of the directory which contains this applet

    See Also:

    • getDocumentBase()

  • getParameter

    Deprecated, for removal: This API element is subject to removal in a future version.

    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, or null if not set

  • getAppletContext

    Deprecated, for removal: This API element is subject to removal in a future version.

    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)

    Deprecated, for removal: This API element is subject to removal in a future version.

    Requests that this applet be resized.

    Overrides:

    resize in class Component

    Parameters:

    width - the new requested width for the applet

    height - the new requested height for the applet

  • resize

    Deprecated, for removal: This API element is subject to removal in a future version.

    Requests that this applet be resized.

    Overrides:

    resize in class Component

    Parameters:

    d - an object giving the new width and height

  • isValidateRoot

    public boolean isValidateRoot()

    Deprecated, for removal: This API element is subject to removal in a future version.

    Applet objects are the validate roots, and, therefore, they override this method to return true.

    Overrides:

    isValidateRoot in class Container

    Returns:

    true

    Since:

    1.7

    See Also:

    • Container.isValidateRoot()

  • showStatus public void showStatus(String msg)

    Deprecated, for removal: This API element is subject to removal in a future version.

    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

    Deprecated, for removal: This API element is subject to removal in a future version.

    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

    Deprecated, for removal: This API element is subject to removal in a future version.

    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

    Deprecated, for removal: This API element is subject to removal in a future version.

    Get an audio clip from the given URL.

    Parameters:

    url - points to the audio clip

    Returns:

    the audio clip at the specified URL

    Since:

    1.2

  • getAudioClip

    Deprecated, for removal: This API element is subject to removal in a future version.

    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

    Deprecated, for removal: This API element is subject to removal in a future version.

    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 String getAppletInfo

    ()

    Deprecated, for removal: This API element is subject to removal in a future version.

    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

    Deprecated, for removal: This API element is subject to removal in a future version.

    Gets the locale of the applet. It allows the applet to maintain its own locale separated from the locale of the browser or appletviewer.

    Overrides:

    getLocale in class Component

    Returns:

    the locale of the applet; if no locale has been set, the default locale is returned

    Since:

    1.1

    See Also:

    • Component.setLocale(java.util.Locale)

  • getParameterInfo public String[][] getParameterInfo

    ()

    Deprecated, for removal: This API element is subject to removal in a future version.

    Returns information about the parameters that 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(URL url)

    Deprecated, for removal: This API element is subject to removal in a future version.

    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

    Deprecated, for removal: This API element is subject to removal in a future version.

    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()

    Deprecated, for removal: This API element is subject to removal in a future version.

    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()

    Deprecated, for removal: This API element is subject to removal in a future version.

    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.

    Note: some methods, such as getLocationOnScreen, can only provide meaningful results if the applet is showing. Because isShowing returns false when the applet's start is first called, methods requiring isShowing to return true should be called from a ComponentListener.

    The implementation of this method provided by the Applet class does nothing.

    See Also:

    • destroy()
    • init()
    • stop()
    • Component.isShowing()
    • ComponentListener.componentShown(ComponentEvent)

  • stop

    public void stop()

    Deprecated, for removal: This API element is subject to removal in a future version.

    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()

    Deprecated, for removal: This API element is subject to removal in a future version.

    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()

  • getAccessibleContext

    Deprecated, for removal: This API element is subject to removal in a future version.

    Gets the AccessibleContext associated with this Applet. For applets, the AccessibleContext takes the form of an AccessibleApplet. A new AccessibleApplet instance is created if necessary.

    Specified by:

    getAccessibleContext in interface Accessible

    Overrides:

    getAccessibleContext in class Panel

    Returns:

    an AccessibleApplet that serves as the AccessibleContext of this Applet

    Since:

    1.3

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