Class Window

java.lang.Object
java.awt.Component
java.awt.Container
java.awt.Window
All Implemented Interfaces:
ImageObserver,MenuContainer,Serializable,Accessible
Direct Known Subclasses:
BasicToolBarUI.DragWindow,Dialog,Frame,JWindow
public classWindowextendsContainerimplementsAccessible
AWindow object is a top-level window with no borders and no menubar. The default layout for a window isBorderLayout.

A window must have either a frame, dialog, or another window defined as its owner when it's constructed.

In a multi-screen environment, you can create aWindow on a different screen device by constructing theWindow withWindow(Window, GraphicsConfiguration). TheGraphicsConfiguration object is one of theGraphicsConfiguration objects of the target screen device.

In a virtual device multi-screen environment in which the desktop area could span multiple physical screen devices, the bounds of all configurations are relative to the virtual device coordinate system. The origin of the virtual-coordinate system is at the upper left-hand corner of the primary physical screen. Depending on the location of the primary screen in the virtual device, negative coordinates are possible, as shown in the following figure.

Diagram shows virtual device containing 4 physical screens. Primary physical screen shows coords (0,0), other screen shows (-80,-100).

In such an environment, when callingsetLocation, you must pass a virtual coordinate to this method. Similarly, callinggetLocationOnScreen on aWindow returns virtual device coordinates. Call thegetBounds method of aGraphicsConfiguration to find its origin in the virtual coordinate system.

The following code sets the location of aWindow at (10, 10) relative to the origin of the physical screen of the correspondingGraphicsConfiguration. If the bounds of theGraphicsConfiguration is not taken into account, theWindow location would be set at (10, 10) relative to the virtual-coordinate system and would appear on the primary physical screen, which might be different from the physical screen of the specifiedGraphicsConfiguration.

      Window w = new Window(Window owner, GraphicsConfiguration gc);      Rectangle bounds = gc.getBounds();      w.setLocation(10 + bounds.x, 10 + bounds.y);

Note: the location and size of top-level windows (includingWindows,Frames, andDialogs) are under the control of the desktop's window management system. Calls tosetLocation,setSize, andsetBounds are requests (not directives) which are forwarded to the window management system. Every effort will be made to honor such requests. However, in some cases the window management system may ignore such requests, or modify the requested geometry in order to place and size theWindow in a way that more closely matches the desktop settings.

Visual effects such as halos, shadows, motion effects and animations may be applied to the window by the desktop window management system. These are outside the knowledge and control of the AWT and so for the purposes of this specification are not considered part of the top-level window.

Due to the asynchronous nature of native event handling, the results returned bygetBounds,getLocation,getLocationOnScreen, andgetSize might not reflect the actual geometry of the Window on screen until the last request has been processed. During the processing of subsequent requests these values might change accordingly while the window management system fulfills the requests.

An application may set the size and location of an invisibleWindow arbitrarily, but the window management system may subsequently change its size and/or location when theWindow is made visible. One or moreComponentEvents will be generated to indicate the new geometry.

Windows are capable of generating the following WindowEvents: WindowOpened, WindowClosed, WindowGainedFocus, WindowLostFocus.

Since:
1.0
See Also:

  • Constructor Details

    • Window

      public Window(Frame owner)
      Constructs a new, initially invisible window with the specifiedFrame as its owner. The window will not be focusable unless its owner is showing on the screen.
      Parameters:
      owner - theFrame to act as owner ornull if this window has no owner
      Throws:
      IllegalArgumentException - if theowner'sGraphicsConfiguration is not from a screen device
      HeadlessException - whenGraphicsEnvironment.isHeadless returnstrue
      See Also:

    • Window

      public Window(Window owner)
      Constructs a new, initially invisible window with the specifiedWindow as its owner. This window will not be focusable unless its nearest owningFrame orDialog is showing on the screen.
      Parameters:
      owner - theWindow to act as owner ornull if this window has no owner
      Throws:
      IllegalArgumentException - if theowner'sGraphicsConfiguration is not from a screen device
      HeadlessException - whenGraphicsEnvironment.isHeadless() returnstrue
      Since:
      1.2
      See Also:

    • Window

      public Window(Window owner,GraphicsConfiguration gc)
      Constructs a new, initially invisible window with the specified ownerWindow and aGraphicsConfiguration of a screen device. The Window will not be focusable unless its nearest owningFrame orDialog is showing on the screen.
      Parameters:
      owner - the window to act as owner ornull if this window has no owner
      gc - theGraphicsConfiguration of the target screen device; ifgc isnull, the system defaultGraphicsConfiguration is assumed
      Throws:
      IllegalArgumentException - ifgc is not from a screen device
      HeadlessException - whenGraphicsEnvironment.isHeadless() returnstrue
      Since:
      1.3
      See Also:

  • Method Details

    • getIconImages

      public List<Image> getIconImages()
      Returns the sequence of images to be displayed as the icon for this window.

      This method returns a copy of the internally stored list, so all operations on the returned object will not affect the window's behavior.

      Returns:
      the copy of icon images' list for this window, or empty list if this window doesn't have icon images.
      Since:
      1.6
      See Also:

    • setIconImages

      public void setIconImages(List<? extendsImage> icons)
      Sets the sequence of images to be displayed as the icon for this window. Subsequent calls togetIconImages will always return a copy of theicons list.

      Depending on the platform capabilities one or several images of different dimensions will be used as the window's icon.

      Theicons list can containMultiResolutionImage images also. Suitable image depending on screen resolution is extracted from baseMultiResolutionImage image and added to the icons list while base resolution image is removed from list. Theicons list is scanned for the images of most appropriate dimensions from the beginning. If the list contains several images of the same size, the first will be used.

      Ownerless windows with no icon specified use platform-default icon. The icon of an owned window may be inherited from the owner unless explicitly overridden. Setting the icon tonull or empty list restores the default behavior.

      Note : Native windowing systems may use different images of differing dimensions to represent a window, depending on the context (e.g. window decoration, window list, taskbar, etc.). They could also use just a single image for all contexts or no image at all.

      Parameters:
      icons - the list of icon images to be displayed.
      Since:
      1.6
      See Also:

    • setIconImage

      public void setIconImage(Image image)
      Sets the image to be displayed as the icon for this window.

      This method can be used instead ofsetIconImages() to specify a single image as a window's icon.

      The following statement:

           setIconImage(image);
      is equivalent to:
           ArrayList<Image> imageList = new ArrayList<Image>();     imageList.add(image);     setIconImages(imageList);

      Note : Native windowing systems may use different images of differing dimensions to represent a window, depending on the context (e.g. window decoration, window list, taskbar, etc.). They could also use just a single image for all contexts or no image at all.

      Parameters:
      image - the icon image to be displayed.
      Since:
      1.6
      See Also:

    • addNotify

      public void addNotify()
      Makes this Window displayable by creating the connection to its native screen resource. This method is called internally by the toolkit and should not be called directly by programs.
      Overrides:
      addNotify in class Container
      Since:
      1.0
      See Also:

    • pack

      public void pack()
      Causes this Window to be sized to fit the preferred size and layouts of its subcomponents. The resulting width and height of the window are automatically enlarged if either of dimensions is less than the minimum size as specified by the previous call to thesetMinimumSize method.

      If the window and/or its owner are not displayable yet, both of them are made displayable before calculating the preferred size. The Window is validated after its size is being calculated.

      See Also:

    • setMinimumSize

      public void setMinimumSize(Dimension minimumSize)
      Sets the minimum size of this window to a constant value. Subsequent calls togetMinimumSize will always return this value. If current window's size is less thanminimumSize the size of the window is automatically enlarged to honor the minimum size.

      If thesetSize orsetBounds methods are called afterwards with a width or height less than that was specified by thesetMinimumSize method the window is automatically enlarged to meet theminimumSize value. TheminimumSize value also affects the behaviour of thepack method.

      The default behavior is restored by setting the minimum size parameter to thenull value.

      Resizing operation may be restricted if the user tries to resize window below theminimumSize value. This behaviour is platform-dependent.

      Overrides:
      setMinimumSize in class Component
      Parameters:
      minimumSize - the new minimum size of this window
      Since:
      1.6
      See Also:

    • setSize

      public void setSize(Dimension d)
      Resizes this component so that it has widthd.width and heightd.height.

      This method changes layout-related information, and therefore, invalidates the component hierarchy.

      Thed.width andd.height values are automatically enlarged if either is less than the minimum size as specified by previous call tosetMinimumSize.

      The method changes the geometry-related data. Therefore, the native windowing system may ignore such requests, or it may modify the requested data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

      Overrides:
      setSize in class Component
      Parameters:
      d - the dimension specifying the new size of this component
      Since:
      1.6
      See Also:

    • setSize

      public void setSize(int width, int height)
      Resizes this component so that it has widthwidth and heightheight.

      This method changes layout-related information, and therefore, invalidates the component hierarchy.

      Thewidth andheight values are automatically enlarged if either is less than the minimum size as specified by previous call tosetMinimumSize.

      The method changes the geometry-related data. Therefore, the native windowing system may ignore such requests, or it may modify the requested data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

      Overrides:
      setSize in class Component
      Parameters:
      width - the new width of this component in pixels
      height - the new height of this component in pixels
      Since:
      1.6
      See Also:

    • setLocation

      public void setLocation(int x, int y)
      Moves this component to a new location. The top-left corner of the new location is specified by thex andy parameters in the coordinate space of this component's parent.

      This method changes layout-related information, and therefore, invalidates the component hierarchy.

      The method changes the geometry-related data. Therefore, the native windowing system may ignore such requests, or it may modify the requested data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

      Overrides:
      setLocation in class Component
      Parameters:
      x - thex-coordinate of the new location's top-left corner in the parent's coordinate space
      y - they-coordinate of the new location's top-left corner in the parent's coordinate space
      See Also:

    • setLocation

      public void setLocation(Point p)
      Moves this component to a new location. The top-left corner of the new location is specified by pointp. Pointp is given in the parent's coordinate space.

      This method changes layout-related information, and therefore, invalidates the component hierarchy.

      The method changes the geometry-related data. Therefore, the native windowing system may ignore such requests, or it may modify the requested data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

      Overrides:
      setLocation in class Component
      Parameters:
      p - the point defining the top-left corner of the new location, given in the coordinate space of this component's parent
      See Also:

    • reshape

      @Deprecatedpublic void reshape(int x, int y, int width, int height)
      Deprecated.
      As of JDK version 1.1, replaced bysetBounds(int, int, int, int).
      Description copied from class: Component
      Reshapes the bounding rectangle for this component.
      Overrides:
      reshape in class Component
      Parameters:
      x - thex coordinate of the upper left corner of the rectangle
      y - they coordinate of the upper left corner of the rectangle
      width - the width of the rectangle
      height - the height of the rectangle

    • setVisible

      public void setVisible(boolean b)
      Shows or hides thisWindow depending on the value of parameterb.

      If the method shows the window then the window is also made focused under the following conditions:

      • TheWindow meets the requirements outlined in theisFocusableWindow() method.
      • TheWindow'sautoRequestFocus property is of thetrue value.
      • Native windowing system allows theWindow to get focused.
      There is an exception for the second condition (the value of theautoRequestFocus property). The property is not taken into account if the window is a modal dialog, which blocks the currently focused window.

      Developers must never assume that the window is the focused or active window until it receives a WINDOW_GAINED_FOCUS or WINDOW_ACTIVATED event.

      Overrides:
      setVisible in class Component
      Parameters:
      b - iftrue, makes theWindow visible, otherwise hides theWindow. If theWindow and/or its owner are not yet displayable, both are made displayable. TheWindow will be validated prior to being made visible. If theWindow is already visible, this will bring theWindow to the front.

      Iffalse, hides thisWindow, its subcomponents, and all of its owned children. TheWindow and its subcomponents can be made visible again with a call to#setVisible(true).

      See Also:

    • show

      @Deprecatedpublic void show()
      Deprecated.
      As of JDK version 1.5, replaced bysetVisible(boolean).
      Makes the Window visible. If the Window and/or its owner are not yet displayable, both are made displayable. The Window will be validated prior to being made visible. If the Window is already visible, this will bring the Window to the front.
      Overrides:
      show in class Component
      See Also:

    • hide

      @Deprecatedpublic void hide()
      Deprecated.
      As of JDK version 1.5, replaced bysetVisible(boolean).
      Hide this Window, its subcomponents, and all of its owned children. The Window and its subcomponents can be made visible again with a call toshow.
      Overrides:
      hide in class Component
      See Also:

    • dispose

      public void dispose()
      Releases all of the native screen resources used by thisWindow, its subcomponents, and all of its owned children. That is, the resources for theseComponents will be destroyed, any memory they consume will be returned to the OS, and they will be marked as undisplayable.

      TheWindow and its subcomponents can be made displayable again by rebuilding the native resources with a subsequent call topack orshow. The states of the recreatedWindow and its subcomponents will be identical to the states of these objects at the point where theWindow was disposed (not accounting for additional modifications between those actions).

      Note: When the last displayable window within the Java virtual machine (VM) is disposed of, the VM may terminate. See AWT Threading Issues for more information.

      See Also:

    • toFront

      public void toFront()
      If this Window is visible, brings this Window to the front and may make it the focused Window.

      Places this Window at the top of the stacking order and shows it in front of any other Windows in this VM. No action will take place if this Window is not visible. Some platforms do not allow Windows which own other Windows to appear on top of those owned Windows. Some platforms may not permit this VM to place its Windows above windows of native applications, or Windows of other VMs. This permission may depend on whether a Window in this VM is already focused. Every attempt will be made to move this Window as high as possible in the stacking order; however, developers should not assume that this method will move this Window above all other windows in every situation.

      Developers must never assume that this Window is the focused or active Window until this Window receives a WINDOW_GAINED_FOCUS or WINDOW_ACTIVATED event. On platforms where the top-most window is the focused window, this method willprobably focus this Window (if it is not already focused) under the following conditions:

      • The window meets the requirements outlined in theisFocusableWindow() method.
      • The window's propertyautoRequestFocus is of thetrue value.
      • Native windowing system allows the window to get focused.
      On platforms where the stacking order does not typically affect the focused window, this method willprobably leave the focused and active Windows unchanged.

      If this method causes this Window to be focused, and this Window is a Frame or a Dialog, it will also become activated. If this Window is focused, but it is not a Frame or a Dialog, then the first Frame or Dialog that is an owner of this Window will be activated.

      If this window is blocked by modal dialog, then the blocking dialog is brought to the front and remains above the blocked window.

      See Also:

    • toBack

      public void toBack()
      If this Window is visible, sends this Window to the back and may cause it to lose focus or activation if it is the focused or active Window.

      Places this Window at the bottom of the stacking order and shows it behind any other Windows in this VM. No action will take place is this Window is not visible. Some platforms do not allow Windows which are owned by other Windows to appear below their owners. Every attempt will be made to move this Window as low as possible in the stacking order; however, developers should not assume that this method will move this Window below all other windows in every situation.

      Because of variations in native windowing systems, no guarantees about changes to the focused and active Windows can be made. Developers must never assume that this Window is no longer the focused or active Window until this Window receives a WINDOW_LOST_FOCUS or WINDOW_DEACTIVATED event. On platforms where the top-most window is the focused window, this method willprobably cause this Window to lose focus. In that case, the next highest, focusable Window in this VM will receive focus. On platforms where the stacking order does not typically affect the focused window, this method willprobably leave the focused and active Windows unchanged.

      See Also:

    • getToolkit

      public Toolkit getToolkit()
      Returns the toolkit of this frame.
      Overrides:
      getToolkit in class Component
      Returns:
      the toolkit of this window.
      See Also:

    • getWarningString

      @Deprecated(since="24",forRemoval=true)public final String getWarningString()
      Deprecated, for removal: This API element is subject to removal in a future version.
      since JDK 24
      Gets the warning string that is displayed with this window.

      Warning strings are no longer applicable, so this method always returnsnull and may be removed in a future release.

      Returns:
      null

    • getLocale

      public Locale getLocale()
      Gets theLocale object that is associated with this window, if the locale has been set. If no locale has been set, then the default locale is returned.
      Overrides:
      getLocale in class Component
      Returns:
      the locale that is set for this window.
      Since:
      1.1
      See Also:

    • getInputContext

      public InputContext getInputContext()
      Gets the input context for this window. A window always has an input context, which is shared by subcomponents unless they create and set their own.
      Overrides:
      getInputContext in class Component
      Returns:
      the input context used by this component;null if no context can be determined
      Since:
      1.2
      See Also:

    • setCursor

      public void setCursor(Cursor cursor)
      Set the cursor image to a specified cursor.

      The method may have no visual effect if the Java platform implementation and/or the native system do not support changing the mouse cursor shape.

      Overrides:
      setCursor in class Component
      Parameters:
      cursor - One of the constants defined by theCursor class. If this parameter is null then the cursor for this window will be set to the type Cursor.DEFAULT_CURSOR.
      Since:
      1.1
      See Also:

    • getOwner

      public Window getOwner()
      Returns the owner of this window.
      Returns:
      the owner of this window
      Since:
      1.2

    • getOwnedWindows

      public Window[] getOwnedWindows()
      Return an array containing all the windows this window currently owns.
      Returns:
      the array of all the owned windows
      Since:
      1.2

    • getWindows

      public static Window[] getWindows()
      Returns an array of allWindows, both owned and ownerless, created by this application. If called from an applet, the array includes only theWindows accessible by that applet.

      Warning: this method may return system created windows, such as a print dialog. Applications should not assume the existence of these dialogs, nor should an application assume anything about these dialogs such as component positions,LayoutManagers or serialization.

      Returns:
      the array of all theWindows created by the application
      Since:
      1.6
      See Also:

    • getOwnerlessWindows

      public static Window[] getOwnerlessWindows()
      Returns an array of allWindows created by this application that have no owner. They includeFrames and ownerlessDialogs andWindows. If called from an applet, the array includes only theWindows accessible by that applet.

      Warning: this method may return system created windows, such as a print dialog. Applications should not assume the existence of these dialogs, nor should an application assume anything about these dialogs such as component positions,LayoutManagers or serialization.

      Returns:
      the array of all the ownerlessWindows created by this application
      Since:
      1.6
      See Also:

    • setModalExclusionType

      public void setModalExclusionType(Dialog.ModalExclusionType exclusionType)
      Specifies the modal exclusion type for this window. If a window is modal excluded, it is not blocked by some modal dialogs. SeeDialog.ModalExclusionType for possible modal exclusion types.

      If the given type is not supported,NO_EXCLUDE is used.

      Note: changing the modal exclusion type for a visible window may have no effect until it is hidden and then shown again.

      Parameters:
      exclusionType - the modal exclusion type for this window; anull value is equivalent toNO_EXCLUDE
      Since:
      1.6
      See Also:

    • getModalExclusionType

      public Dialog.ModalExclusionType getModalExclusionType()
      Returns the modal exclusion type of this window.
      Returns:
      the modal exclusion type of this window
      Since:
      1.6
      See Also:

    • addWindowListener

      public void addWindowListener(WindowListener l)
      Adds the specified window listener to receive window events from this window. If l is null, no exception is thrown and no action is performed.

      Refer toAWT Threading Issues for details on AWT's threading model.

      Parameters:
      l - the window listener
      See Also:

    • addWindowStateListener

      public void addWindowStateListener(WindowStateListener l)
      Adds the specified window state listener to receive window events from this window. Ifl isnull, no exception is thrown and no action is performed.

      Refer toAWT Threading Issues for details on AWT's threading model.

      Parameters:
      l - the window state listener
      Since:
      1.4
      See Also:

    • addWindowFocusListener

      public void addWindowFocusListener(WindowFocusListener l)
      Adds the specified window focus listener to receive window events from this window. If l is null, no exception is thrown and no action is performed.

      Refer toAWT Threading Issues for details on AWT's threading model.

      Parameters:
      l - the window focus listener
      Since:
      1.4
      See Also:

    • removeWindowListener

      public void removeWindowListener(WindowListener l)
      Removes the specified window listener so that it no longer receives window events from this window. If l is null, no exception is thrown and no action is performed.

      Refer toAWT Threading Issues for details on AWT's threading model.

      Parameters:
      l - the window listener
      See Also:

    • removeWindowStateListener

      public void removeWindowStateListener(WindowStateListener l)
      Removes the specified window state listener so that it no longer receives window events from this window. Ifl isnull, no exception is thrown and no action is performed.

      Refer toAWT Threading Issues for details on AWT's threading model.

      Parameters:
      l - the window state listener
      Since:
      1.4
      See Also:

    • removeWindowFocusListener

      public void removeWindowFocusListener(WindowFocusListener l)
      Removes the specified window focus listener so that it no longer receives window events from this window. If l is null, no exception is thrown and no action is performed.

      Refer toAWT Threading Issues for details on AWT's threading model.

      Parameters:
      l - the window focus listener
      Since:
      1.4
      See Also:

    • getWindowListeners

      public WindowListener[] getWindowListeners()
      Returns an array of all the window listeners registered on this window.
      Returns:
      all of this window'sWindowListeners or an empty array if no window listeners are currently registered
      Since:
      1.4
      See Also:

    • getWindowFocusListeners

      public WindowFocusListener[] getWindowFocusListeners()
      Returns an array of all the window focus listeners registered on this window.
      Returns:
      all of this window'sWindowFocusListeners or an empty array if no window focus listeners are currently registered
      Since:
      1.4
      See Also:

    • getWindowStateListeners

      public WindowStateListener[] getWindowStateListeners()
      Returns an array of all the window state listeners registered on this window.
      Returns:
      all of this window'sWindowStateListeners or an empty array if no window state listeners are currently registered
      Since:
      1.4
      See Also:

    • getListeners

      public <T extendsEventListener> T[] getListeners(Class<T> listenerType)
      Returns an array of all the objects currently registered asFooListeners upon thisWindow.FooListeners are registered using theaddFooListener method.

      You can specify thelistenerType argument with a class literal, such asFooListener.class. For example, you can query aWindow w for its window listeners with the following code:

      WindowListener[] wls = (WindowListener[])(w.getListeners(WindowListener.class));
      If no such listeners exist, this method returns an empty array.

      Overrides:
      getListeners in class Container
      Type Parameters:
      T - the type of the listeners
      Parameters:
      listenerType - the type of listeners requested; this parameter should specify an interface that descends fromjava.util.EventListener
      Returns:
      an array of all objects registered asFooListeners on this window, or an empty array if no such listeners have been added
      Throws:
      ClassCastException - iflistenerType doesn't specify a class or interface that implementsjava.util.EventListener
      NullPointerException - iflistenerType isnull
      Since:
      1.3
      See Also:

    • processEvent

      protected void processEvent(AWTEvent e)
      Processes events on this window. If the event is anWindowEvent, it invokes theprocessWindowEvent method, else it invokes its superclass'sprocessEvent.

      Note that if the event parameter isnull the behavior is unspecified and may result in an exception.

      Overrides:
      processEvent in class Container
      Parameters:
      e - the event
      See Also:

    • processWindowEvent

      protected void processWindowEvent(WindowEvent e)
      Processes window events occurring on this window by dispatching them to any registered WindowListener objects. NOTE: This method will not be called unless window events are enabled for this component; this happens when one of the following occurs:
      • A WindowListener object is registered viaaddWindowListener
      • Window events are enabled viaenableEvents

      Note that if the event parameter isnull the behavior is unspecified and may result in an exception.

      Parameters:
      e - the window event
      See Also:

    • processWindowFocusEvent

      protected void processWindowFocusEvent(WindowEvent e)
      Processes window focus event occurring on this window by dispatching them to any registered WindowFocusListener objects. NOTE: this method will not be called unless window focus events are enabled for this window. This happens when one of the following occurs:
      • a WindowFocusListener is registered viaaddWindowFocusListener
      • Window focus events are enabled viaenableEvents

      Note that if the event parameter isnull the behavior is unspecified and may result in an exception.

      Parameters:
      e - the window focus event
      Since:
      1.4
      See Also:

    • processWindowStateEvent

      protected void processWindowStateEvent(WindowEvent e)
      Processes window state event occurring on this window by dispatching them to any registeredWindowStateListener objects. NOTE: this method will not be called unless window state events are enabled for this window. This happens when one of the following occurs:
      • aWindowStateListener is registered viaaddWindowStateListener
      • window state events are enabled viaenableEvents

      Note that if the event parameter isnull the behavior is unspecified and may result in an exception.

      Parameters:
      e - the window state event
      Since:
      1.4
      See Also:

    • setAlwaysOnTop

      public final void setAlwaysOnTop(boolean alwaysOnTop)
      Sets whether this window should always be above other windows. If there are multiple always-on-top windows, their relative order is unspecified and platform dependent.

      If some other window is already always-on-top then the relative order between these windows is unspecified (depends on platform). No window can be brought to be over the always-on-top window except maybe another always-on-top window.

      All windows owned by an always-on-top window inherit this state and automatically become always-on-top. If a window ceases to be always-on-top, the windows that it owns will no longer be always-on-top. When an always-on-top window is senttoBack, its always-on-top state is set tofalse.

      When this method is called on a window with a value oftrue, and the window is visible and the platform supports always-on-top for this window, the window is immediately brought forward, "sticking" it in the top-most position. If the window isn`t currently visible, this method sets the always-on-top state totrue but does not bring the window forward. When the window is later shown, it will be always-on-top.

      When this method is called on a window with a value offalse the always-on-top state is set to normal. It may also cause an unspecified, platform-dependent change in the z-order of top-level windows, but other always-on-top windows will remain in top-most position. Calling this method with a value offalse on a window that has a normal state has no effect.

      Note: some platforms might not support always-on-top windows. To detect if always-on-top windows are supported by the current platform, useToolkit.isAlwaysOnTopSupported() andisAlwaysOnTopSupported(). If always-on-top mode isn't supported for this window or this window's toolkit does not support always-on-top windows, calling this method has no effect.

      Parameters:
      alwaysOnTop - true if the window should always be above other windows
      Since:
      1.5
      See Also:

    • isAlwaysOnTopSupported

      public boolean isAlwaysOnTopSupported()
      Returns whether the always-on-top mode is supported for this window. Some platforms may not support always-on-top windows, some may support only some kinds of top-level windows; for example, a platform may not support always-on-top modal dialogs.
      Returns:
      true, if the always-on-top mode is supported for this window and this window's toolkit supports always-on-top windows,false otherwise
      Since:
      1.6
      See Also:

    • isAlwaysOnTop

      public final boolean isAlwaysOnTop()
      Returns whether this window is an always-on-top window.
      Returns:
      true, if the window is in always-on-top state,false otherwise
      Since:
      1.5
      See Also:

    • getFocusOwner

      public Component getFocusOwner()
      Returns the child Component of this Window that has focus if this Window is focused; returns null otherwise.
      Returns:
      the child Component with focus, or null if this Window is not focused
      See Also:

    • getMostRecentFocusOwner

      public Component getMostRecentFocusOwner()
      Returns the child Component of this Window that will receive the focus when this Window is focused. If this Window is currently focused, this method returns the same Component asgetFocusOwner(). If this Window is not focused, then the child Component that most recently requested focus will be returned. If no child Component has ever requested focus, and this is a focusable Window, then this Window's initial focusable Component is returned. If no child Component has ever requested focus, and this is a non-focusable Window, null is returned.
      Returns:
      the child Component that will receive focus when this Window is focused
      Since:
      1.4
      See Also:

    • isActive

      public boolean isActive()
      Returns whether this Window is active. Only a Frame or a Dialog may be active. The native windowing system may denote the active Window or its children with special decorations, such as a highlighted title bar. The active Window is always either the focused Window, or the first Frame or Dialog that is an owner of the focused Window.
      Returns:
      whether this is the active Window.
      Since:
      1.4
      See Also:

    • isFocused

      public boolean isFocused()
      Returns whether this Window is focused. If there exists a focus owner, the focused Window is the Window that is, or contains, that focus owner. If there is no focus owner, then no Window is focused.

      If the focused Window is a Frame or a Dialog it is also the active Window. Otherwise, the active Window is the first Frame or Dialog that is an owner of the focused Window.

      Returns:
      whether this is the focused Window.
      Since:
      1.4
      See Also:

    • getFocusTraversalKeys

      public Set<AWTKeyStroke> getFocusTraversalKeys(int id)
      Gets a focus traversal key for this Window. (See setFocusTraversalKeys for a full description of each key.)

      If the traversal key has not been explicitly set for this Window, then this Window's parent's traversal key is returned. If the traversal key has not been explicitly set for any of this Window's ancestors, then the current KeyboardFocusManager's default traversal key is returned.

      Overrides:
      getFocusTraversalKeys in class Container
      Parameters:
      id - one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS
      Returns:
      the AWTKeyStroke for the specified key
      Throws:
      IllegalArgumentException - if id is not one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or KeyboardFocusManager.DOWN_CYCLE_TRAVERSAL_KEYS
      Since:
      1.4
      See Also:

    • setFocusCycleRoot

      public final void setFocusCycleRoot(boolean focusCycleRoot)
      Does nothing because Windows must always be roots of a focus traversal cycle. The passed-in value is ignored.
      Overrides:
      setFocusCycleRoot in class Container
      Parameters:
      focusCycleRoot - this value is ignored
      Since:
      1.4
      See Also:

    • isFocusCycleRoot

      public final boolean isFocusCycleRoot()
      Always returnstrue because all Windows must be roots of a focus traversal cycle.
      Overrides:
      isFocusCycleRoot in class Container
      Returns:
      true
      Since:
      1.4
      See Also:

    • getFocusCycleRootAncestor

      public final Container getFocusCycleRootAncestor()
      Always returnsnull because Windows have no ancestors; they represent the top of the Component hierarchy.
      Overrides:
      getFocusCycleRootAncestor in class Component
      Returns:
      null
      Since:
      1.4
      See Also:

    • isFocusableWindow

      public final boolean isFocusableWindow()
      Returns whether this Window can become the focused Window, that is, whether this Window or any of its subcomponents can become the focus owner. For a Frame or Dialog to be focusable, its focusable Window state must be set totrue. For a Window which is not a Frame or Dialog to be focusable, its focusable Window state must be set totrue, its nearest owning Frame or Dialog must be showing on the screen, and it must contain at least one Component in its focus traversal cycle. If any of these conditions is not met, then neither this Window nor any of its subcomponents can become the focus owner.
      Returns:
      true if this Window can be the focused Window;false otherwise
      Since:
      1.4
      See Also:

    • getFocusableWindowState

      public boolean getFocusableWindowState()
      Returns whether this Window can become the focused Window if it meets the other requirements outlined inisFocusableWindow. If this method returnsfalse, thenisFocusableWindow will returnfalse as well. If this method returnstrue, thenisFocusableWindow may returntrue orfalse depending upon the other requirements which must be met in order for a Window to be focusable.

      By default, all Windows have a focusable Window state oftrue.

      Returns:
      whether this Window can be the focused Window
      Since:
      1.4
      See Also:

    • setFocusableWindowState

      public void setFocusableWindowState(boolean focusableWindowState)
      Sets whether this Window can become the focused Window if it meets the other requirements outlined inisFocusableWindow. If this Window's focusable Window state is set tofalse, thenisFocusableWindow will returnfalse. If this Window's focusable Window state is set totrue, thenisFocusableWindow may returntrue orfalse depending upon the other requirements which must be met in order for a Window to be focusable.

      Setting a Window's focusability state tofalse is the standard mechanism for an application to identify to the AWT a Window which will be used as a floating palette or toolbar, and thus should be a non-focusable Window. Setting the focusability state on a visibleWindow can have a delayed effect on some platforms — the actual change may happen only when theWindow becomes hidden and then visible again. To ensure consistent behavior across platforms, set theWindow's focusable state when theWindow is invisible and then show it.

      Parameters:
      focusableWindowState - whether this Window can be the focused Window
      Since:
      1.4
      See Also:

    • setAutoRequestFocus

      public void setAutoRequestFocus(boolean autoRequestFocus)
      Sets whether this window should receive focus on subsequently being shown (with a call tosetVisible(true)), or being moved to the front (with a call totoFront()).

      Note thatsetVisible(true) may be called indirectly (e.g. when showing an owner of the window makes the window to be shown).toFront() may also be called indirectly (e.g. whensetVisible(true) is called on already visible window). In all such cases this property takes effect as well.

      The value of the property is not inherited by owned windows.

      Parameters:
      autoRequestFocus - whether this window should be focused on subsequently being shown or being moved to the front
      Since:
      1.7
      See Also:

    • isAutoRequestFocus

      public boolean isAutoRequestFocus()
      Returns whether this window should receive focus on subsequently being shown (with a call tosetVisible(true)), or being moved to the front (with a call totoFront()).

      By default, the window hasautoRequestFocus value oftrue.

      Returns:
      autoRequestFocus value
      Since:
      1.7
      See Also:

    • addPropertyChangeListener

      public void addPropertyChangeListener(PropertyChangeListener listener)
      Adds a PropertyChangeListener to the listener list. The listener is registered for all bound properties of this class, including the following:
      • this Window's font ("font")
      • this Window's background color ("background")
      • this Window's foreground color ("foreground")
      • this Window's focusability ("focusable")
      • this Window's focus traversal keys enabled state ("focusTraversalKeysEnabled")
      • this Window's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys")
      • this Window's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys")
      • this Window's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys")
      • this Window's Set of DOWN_CYCLE_TRAVERSAL_KEYS ("downCycleFocusTraversalKeys")
      • this Window's focus traversal policy ("focusTraversalPolicy")
      • this Window's focusable Window state ("focusableWindowState")
      • this Window's always-on-top state("alwaysOnTop")
      Note that if this Window is inheriting a bound property, then no event will be fired in response to a change in the inherited property.

      If listener is null, no exception is thrown and no action is performed.

      Overrides:
      addPropertyChangeListener in class Container
      Parameters:
      listener - the PropertyChangeListener to be added
      See Also:

    • addPropertyChangeListener

      public void addPropertyChangeListener(String propertyName,PropertyChangeListener listener)
      Adds a PropertyChangeListener to the listener list for a specific property. The specified property may be user-defined, or one of the following:
      • this Window's font ("font")
      • this Window's background color ("background")
      • this Window's foreground color ("foreground")
      • this Window's focusability ("focusable")
      • this Window's focus traversal keys enabled state ("focusTraversalKeysEnabled")
      • this Window's Set of FORWARD_TRAVERSAL_KEYS ("forwardFocusTraversalKeys")
      • this Window's Set of BACKWARD_TRAVERSAL_KEYS ("backwardFocusTraversalKeys")
      • this Window's Set of UP_CYCLE_TRAVERSAL_KEYS ("upCycleFocusTraversalKeys")
      • this Window's Set of DOWN_CYCLE_TRAVERSAL_KEYS ("downCycleFocusTraversalKeys")
      • this Window's focus traversal policy ("focusTraversalPolicy")
      • this Window's focusable Window state ("focusableWindowState")
      • this Window's always-on-top state("alwaysOnTop")
      Note that if this Window is inheriting a bound property, then no event will be fired in response to a change in the inherited property.

      If listener is null, no exception is thrown and no action is performed.

      Overrides:
      addPropertyChangeListener in class Container
      Parameters:
      propertyName - one of the property names listed above
      listener - the PropertyChangeListener to be added
      See Also:

    • isValidateRoot

      public boolean isValidateRoot()
      Indicates if this container is a validate root.

      Window objects are the validate roots, and, therefore, they override this method to returntrue.

      Overrides:
      isValidateRoot in class Container
      Returns:
      true
      Since:
      1.7
      See Also:

    • postEvent

      @Deprecatedpublic boolean postEvent(Event e)
      Deprecated.
      As of JDK version 1.1 replaced bydispatchEvent(AWTEvent).
      Description copied from interface: MenuContainer
      Posts an event to the listeners.
      Specified by:
      postEvent in interface MenuContainer
      Overrides:
      postEvent in class Component
      Parameters:
      e - the event to dispatch
      Returns:
      the results of posting the event

    • isShowing

      public boolean isShowing()
      Checks if this Window is showing on screen.
      Overrides:
      isShowing in class Component
      Returns:
      true if the component is showing,false otherwise
      See Also:

    • applyResourceBundle

      @Deprecatedpublic void applyResourceBundle(ResourceBundle rb)
      Deprecated.
      As of J2SE 1.4, replaced byComponent.applyComponentOrientation.
      Parameters:
      rb - the resource bundle

    • applyResourceBundle

      @Deprecatedpublic void applyResourceBundle(String rbName)
      Deprecated.
      As of J2SE 1.4, replaced byComponent.applyComponentOrientation.
      Parameters:
      rbName - the resource name

    • setType

      public void setType(Window.Type type)
      Sets the type of the window. This method can only be called while the window is not displayable.
      Parameters:
      type - the window type
      Throws:
      IllegalComponentStateException - if the window is displayable.
      IllegalArgumentException - if the type isnull
      Since:
      1.7
      See Also:

    • getType

      public Window.Type getType()
      Returns the type of the window.
      Returns:
      the type of the window
      Since:
      1.7
      See Also:

    • getAccessibleContext

      public AccessibleContext getAccessibleContext()
      Gets the AccessibleContext associated with this Window. For windows, the AccessibleContext takes the form of an AccessibleAWTWindow. A new AccessibleAWTWindow instance is created if necessary.
      Specified by:
      getAccessibleContext in interface Accessible
      Overrides:
      getAccessibleContext in class Component
      Returns:
      an AccessibleAWTWindow that serves as the AccessibleContext of this Window
      Since:
      1.3

    • setLocationRelativeTo

      public void setLocationRelativeTo(Component c)
      Sets the location of the window relative to the specified component according to the following scenarios.

      The target screen mentioned below is a screen to which the window should be placed after the setLocationRelativeTo method is called.

      • If the component isnull, or the GraphicsConfiguration associated with this component isnull, the window is placed in the center of the screen. The center point can be obtained with theGraphicsEnvironment.getCenterPoint method.
      • If the component is notnull, but it is not currently showing, the window is placed in the center of the target screen defined by the GraphicsConfiguration associated with this component.
      • If the component is notnull and is shown on the screen, then the window is located in such a way that the center of the window coincides with the center of the component.

      If the screens configuration does not allow the window to be moved from one screen to another, then the window is only placed at the location determined according to the above conditions and itsGraphicsConfiguration is not changed.

      Note: If the lower edge of the window is out of the screen, then the window is placed to the side of theComponent that is closest to the center of the screen. So if the component is on the right part of the screen, the window is placed to its left, and vice versa.

      If after the window location has been calculated, the upper, left, or right edge of the window is out of the screen, then the window is located in such a way that the upper, left, or right edge of the window coincides with the corresponding edge of the screen. If both left and right edges of the window are out of the screen, the window is placed at the left side of the screen. The similar placement will occur if both top and bottom edges are out of the screen. In that case, the window is placed at the top side of the screen.

      The method changes the geometry-related data. Therefore, the native windowing system may ignore such requests, or it may modify the requested data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

      Parameters:
      c - the component in relation to which the window's location is determined
      Since:
      1.4
      See Also:

    • createBufferStrategy

      public void createBufferStrategy(int numBuffers)
      Creates a new strategy for multi-buffering on this component. Multi-buffering is useful for rendering performance. This method attempts to create the best strategy available with the number of buffers supplied. It will always create aBufferStrategy with that number of buffers. A page-flipping strategy is attempted first, then a blitting strategy using accelerated buffers. Finally, an unaccelerated blitting strategy is used.

      Each time this method is called, the existing buffer strategy for this component is discarded.

      Parameters:
      numBuffers - number of buffers to create
      Throws:
      IllegalArgumentException - if numBuffers is less than 1.
      IllegalStateException - if the component is not displayable
      Since:
      1.4
      See Also:

    • createBufferStrategy

      public void createBufferStrategy(int numBuffers,BufferCapabilities caps) throwsAWTException
      Creates a new strategy for multi-buffering on this component with the required buffer capabilities. This is useful, for example, if only accelerated memory or page flipping is desired (as specified by the buffer capabilities).

      Each time this method is called, the existing buffer strategy for this component is discarded.

      Parameters:
      numBuffers - number of buffers to create, including the front buffer
      caps - the required capabilities for creating the buffer strategy; cannot benull
      Throws:
      AWTException - if the capabilities supplied could not be supported or met; this may happen, for example, if there is not enough accelerated memory currently available, or if page flipping is specified but not possible.
      IllegalArgumentException - if numBuffers is less than 1, or if caps isnull
      Since:
      1.4
      See Also:

    • getBufferStrategy

      public BufferStrategy getBufferStrategy()
      Returns theBufferStrategy used by this component. This method will return null if aBufferStrategy has not yet been created or has been disposed.
      Returns:
      the buffer strategy used by this component
      Since:
      1.4
      See Also:

    • setLocationByPlatform

      public void setLocationByPlatform(boolean locationByPlatform)
      Sets whether this Window should appear at the default location for the native windowing system or at the current location (returned bygetLocation) the next time the Window is made visible. This behavior resembles a native window shown without programmatically setting its location. Most windowing systems cascade windows if their locations are not explicitly set. The actual location is determined once the window is shown on the screen.

      This behavior can also be enabled by setting the System Property "java.awt.Window.locationByPlatform" to "true", though calls to this method take precedence.

      Calls tosetVisible,setLocation andsetBounds after callingsetLocationByPlatform clear this property of the Window.

      For example, after the following code is executed:

       setLocationByPlatform(true); setVisible(true); boolean flag = isLocationByPlatform();
      The window will be shown at platform's default location andflag will befalse.

      In the following sample:

       setLocationByPlatform(true); setLocation(10, 10); boolean flag = isLocationByPlatform(); setVisible(true);
      The window will be shown at (10, 10) andflag will befalse.

      Parameters:
      locationByPlatform -true if this Window should appear at the default location,false if at the current location
      Throws:
      IllegalComponentStateException - if the window is showing on screen and locationByPlatform istrue.
      Since:
      1.5
      See Also:

    • isLocationByPlatform

      public boolean isLocationByPlatform()
      Returnstrue if this Window will appear at the default location for the native windowing system the next time this Window is made visible. This method always returnsfalse if the Window is showing on the screen.
      Returns:
      whether this Window will appear at the default location
      Since:
      1.5
      See Also:

    • setBounds

      public void setBounds(int x, int y, int width, int height)
      Moves and resizes this component. The new location of the top-left corner is specified byx andy, and the new size is specified bywidth andheight.

      This method changes layout-related information, and therefore, invalidates the component hierarchy.

      Thewidth orheight values are automatically enlarged if either is less than the minimum size as specified by previous call tosetMinimumSize.

      The method changes the geometry-related data. Therefore, the native windowing system may ignore such requests, or it may modify the requested data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

      Overrides:
      setBounds in class Component
      Parameters:
      x - the newx-coordinate of this component
      y - the newy-coordinate of this component
      width - the newwidth of this component
      height - the newheight of this component
      Since:
      1.6
      See Also:

    • setBounds

      public void setBounds(Rectangle r)
      Moves and resizes this component to conform to the new bounding rectangler. This component's new position is specified byr.x andr.y, and its new size is specified byr.width andr.height

      This method changes layout-related information, and therefore, invalidates the component hierarchy.

      Ther.width orr.height values will be automatically enlarged if either is less than the minimum size as specified by previous call tosetMinimumSize.

      The method changes the geometry-related data. Therefore, the native windowing system may ignore such requests, or it may modify the requested data, so that theWindow object is placed and sized in a way that corresponds closely to the desktop settings.

      Overrides:
      setBounds in class Component
      Parameters:
      r - the new bounding rectangle for this component
      Since:
      1.6
      See Also:

    • getOpacity

      public float getOpacity()
      Returns the opacity of the window.
      Returns:
      the opacity of the window
      Since:
      1.7
      See Also:

    • setOpacity

      public void setOpacity(float opacity)
      Sets the opacity of the window.

      The opacity value is in the range [0..1]. Note that setting the opacity level of 0 may or may not disable the mouse event handling on this window. This is a platform-dependent behavior.

      The following conditions must be met in order to set the opacity value less than1.0f:

      If the requested opacity value is less than1.0f, and any of the above conditions are not met, the window opacity will not change, and theIllegalComponentStateException will be thrown.

      The translucency levels of individual pixels may also be effected by the alpha component of their color (seesetBackground(Color)) and the current shape of this window (seesetShape(Shape)).

      Parameters:
      opacity - the opacity level to set to the window
      Throws:
      IllegalArgumentException - if the opacity is out of the range [0..1]
      IllegalComponentStateException - if the window is decorated and the opacity is less than1.0f
      IllegalComponentStateException - if the window is in full screen mode, and the opacity is less than1.0f
      UnsupportedOperationException - if the GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT translucency is not supported and the opacity is less than1.0f
      Since:
      1.7
      See Also:

    • getShape

      public Shape getShape()
      Returns the shape of the window. The value returned by this method may not be the same as previously set withsetShape(shape), but it is guaranteed to represent the same shape.
      Returns:
      the shape of the window ornull if no shape is specified for the window
      Since:
      1.7
      See Also:

    • setShape

      public void setShape(Shape shape)
      Sets the shape of the window.

      Setting a shape cuts off some parts of the window. Only the parts that belong to the givenShape remain visible and clickable. If the shape argument isnull, this method restores the default shape, making the window rectangular on most platforms.

      The following conditions must be met to set a non-null shape:

      If the requested shape is notnull, and any of the above conditions are not met, the shape of this window will not change, and either theUnsupportedOperationException or IllegalComponentStateException will be thrown.

      The translucency levels of individual pixels may also be effected by the alpha component of their color (seesetBackground(Color)) and the opacity value (seesetOpacity(float)). SeeGraphicsDevice.WindowTranslucency for more details.

      Parameters:
      shape - the shape to set to the window
      Throws:
      IllegalComponentStateException - if the shape is not null and the window is decorated
      IllegalComponentStateException - if the shape is not null and the window is in full-screen mode
      UnsupportedOperationException - if the shape is not null andPERPIXEL_TRANSPARENT translucency is not supported
      Since:
      1.7
      See Also:

    • getBackground

      public Color getBackground()
      Gets the background color of this window.

      Note that the alpha component of the returned color indicates whether the window is in the non-opaque (per-pixel translucent) mode.

      Overrides:
      getBackground in class Component
      Returns:
      this component's background color
      See Also:

    • setBackground

      public void setBackground(Color bgColor)
      Sets the background color of this window.

      If the windowing system supports thePERPIXEL_TRANSLUCENT translucency, the alpha component of the given background color may effect the mode of operation for this window: it indicates whether this window must be opaque (alpha equals1.0f) or per-pixel translucent (alpha is less than1.0f). If the given background color isnull, the window is considered completely opaque.

      All the following conditions must be met to enable the per-pixel transparency mode for this window:

      If the alpha component of the requested background color is less than1.0f, and any of the above conditions are not met, the background color of this window will not change, the alpha component of the given background color will not affect the mode of operation for this window, and either theUnsupportedOperationException or IllegalComponentStateException will be thrown.

      When the window is per-pixel translucent, the drawing sub-system respects the alpha value of each individual pixel. If a pixel gets painted with the alpha color component equal to zero, it becomes visually transparent. If the alpha of the pixel is equal to 1.0f, the pixel is fully opaque. Interim values of the alpha color component make the pixel semi-transparent. In this mode, the background of the window gets painted with the alpha value of the given background color. If the alpha value of the argument of this method is equal to0, the background is not painted at all.

      The actual level of translucency of a given pixel also depends on window opacity (seesetOpacity(float)), as well as the current shape of this window (seesetShape(Shape)).

      Note that painting a pixel with the alpha value of0 may or may not disable the mouse event handling on this pixel. This is a platform-dependent behavior. To make sure the mouse events do not get dispatched to a particular pixel, the pixel must be excluded from the shape of the window.

      Enabling the per-pixel translucency mode may change the graphics configuration of this window due to the native platform requirements.

      Overrides:
      setBackground in class Component
      Parameters:
      bgColor - the color to become this window's background color.
      Throws:
      IllegalComponentStateException - if the alpha value of the given background color is less than1.0f and the window is decorated
      IllegalComponentStateException - if the alpha value of the given background color is less than1.0f and the window is in full-screen mode
      UnsupportedOperationException - if the alpha value of the given background color is less than1.0f andPERPIXEL_TRANSLUCENT translucency is not supported
      See Also:

    • isOpaque

      public boolean isOpaque()
      Indicates if the window is currently opaque.

      The method returnsfalse if the background color of the window is notnull and the alpha component of the color is less than1.0f. The method returnstrue otherwise.

      Overrides:
      isOpaque in class Component
      Returns:
      true if the window is opaque,false otherwise
      Since:
      1.7
      See Also:

    • paint

      public void paint(Graphics g)
      Paints the container. This forwards the paint to any lightweight components that are children of this container. If this method is reimplemented, super.paint(g) should be called so that lightweight components are properly rendered. If a child component is entirely clipped by the current clipping setting in g, paint() will not be forwarded to that child.
      Overrides:
      paint in class Container
      Parameters:
      g - the specified Graphics window
      Since:
      1.7
      See Also: