JWindow (Java Platform SE 8 )
Keywords: javax.swing.JWindow class
Date: 2016-07-28

javax.swing

## Class JWindow

- java.lang.Object
- - java.awt.Component
  - - java.awt.Container
    - - java.awt.Window
      - - javax.swing.JWindow

- All Implemented Interfaces:
    ImageObserver, MenuContainer, Serializable, Accessible, RootPaneContainer

      public class JWindow
      extends Window
      implements Accessible, RootPaneContainer

  A `JWindow` is a container that can be displayed anywhere on the user's desktop. It does not have the title bar, window-management buttons, or other trimmings associated with a `JFrame`, but it is still a "first-class citizen" of the user's desktop, and can exist anywhere on it.

  The `JWindow` component contains a `JRootPane` as its only child. The `contentPane` should be the parent of any children of the `JWindow`. As a convenience, the `add`, `remove`, and `setLayout` methods of this class are overridden, so that they delegate calls to the corresponding methods of the `ContentPane`. For example, you can add a child component to a window as follows:

             window.add(child);

  And the child will be added to the contentPane. The `contentPane` will always be non-`null`. Attempting to set it to `null` will cause the `JWindow` to throw an exception. The default `contentPane` will have a `BorderLayout` manager set on it. Refer to `RootPaneContainer` for details on adding, removing and setting the `LayoutManager` of a `JWindow`.

  Please see the `JRootPane` documentation for a complete description of the `contentPane`, `glassPane`, and `layeredPane` components.

  In a multi-screen environment, you can create a `JWindow` on a different screen device. See `Window` for more information.

  Warning: Swing is not thread safe. For more information see Swing's Threading Policy.

  Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans™ has been added to the `java.beans` package. Please see `XMLEncoder`.

  See Also:
    `JRootPane`

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `protected class` | `JWindow.AccessibleJWindow` This class implements accessibility support for the `JWindow` class.

    - ### Nested classes/interfaces inherited from class java.awt.Window

      `Window.AccessibleAWTWindow, Window.Type`

    - ### Nested classes/interfaces inherited from class java.awt.Container

      `Container.AccessibleAWTContainer`

    - ### Nested classes/interfaces inherited from class java.awt.Component

      `Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected AccessibleContext` | `accessibleContext` The accessible context property.
    `protected JRootPane` | `rootPane` The `JRootPane` instance that manages the `contentPane` and optional `menuBar` for this frame, as well as the `glassPane`.
    `protected boolean` | `rootPaneCheckingEnabled` If true then calls to `add` and `setLayout` will be forwarded to the `contentPane`.

    - ### Fields inherited from class java.awt.Component

      `BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

    - ### Fields inherited from interface java.awt.image.ImageObserver

      `ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `JWindow()` Creates a window with no specified owner.
    `JWindow(Frame owner)` Creates a window with the specified owner frame.
    `JWindow(GraphicsConfiguration gc)` Creates a window with the specified `GraphicsConfiguration` of a screen device.
    `JWindow(Window owner)` Creates a window with the specified owner window.
    `JWindow(Window owner, GraphicsConfiguration gc)` Creates a window with the specified owner window and `GraphicsConfiguration` of a screen device.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `protected void` | `addImpl(Component comp, Object constraints, int index)` Adds the specified child `Component`.
    `protected JRootPane` | `createRootPane()` Called by the constructor methods to create the default `rootPane`.
    `AccessibleContext` | `getAccessibleContext()` Gets the AccessibleContext associated with this JWindow.
    `Container` | `getContentPane()` Returns the `Container` which is the `contentPane` for this window.
    `Component` | `getGlassPane()` Returns the `glassPane Component` for this window.
    `Graphics` | `getGraphics()` Creates a graphics context for this component.
    `JLayeredPane` | `getLayeredPane()` Returns the `layeredPane` object for this window.
    `JRootPane` | `getRootPane()` Returns the `rootPane` object for this window.
    `TransferHandler` | `getTransferHandler()` Gets the `transferHandler` property.
    `protected boolean` | `isRootPaneCheckingEnabled()` Returns whether calls to `add` and `setLayout` are forwarded to the `contentPane`.
    `protected String` | `paramString()` Returns a string representation of this `JWindow`.
    `void` | `remove(Component comp)` Removes the specified component from the container.
    `void` | `repaint(long time, int x, int y, int width, int height)` Repaints the specified rectangle of this component within `time` milliseconds.
    `void` | `setContentPane(Container contentPane)` Sets the `contentPane` property for this window.
    `void` | `setGlassPane(Component glassPane)` Sets the `glassPane` property.
    `void` | `setLayeredPane(JLayeredPane layeredPane)` Sets the `layeredPane` property.
    `void` | `setLayout(LayoutManager manager)` Sets the `LayoutManager`.
    `protected void` | `setRootPane(JRootPane root)` Sets the new `rootPane` object for this window.
    `protected void` | `setRootPaneCheckingEnabled(boolean enabled)` Sets whether calls to `add` and `setLayout` are forwarded to the `contentPane`.
    `void` | `setTransferHandler(TransferHandler newHandler)` Sets the `transferHandler` property, which is a mechanism to support transfer of data into this component.
    `void` | `update(Graphics g)` Calls `paint(g)`.
    `protected void` | `windowInit()` Called by the constructors to init the `JWindow` properly.

    - ### Methods inherited from class java.awt.Window

      `addNotify, addPropertyChangeListener, addPropertyChangeListener, addWindowFocusListener, addWindowListener, addWindowStateListener, applyResourceBundle, applyResourceBundle, createBufferStrategy, createBufferStrategy, dispose, getBackground, getBufferStrategy, getFocusableWindowState, getFocusCycleRootAncestor, getFocusOwner, getFocusTraversalKeys, getIconImages, getInputContext, getListeners, getLocale, getModalExclusionType, getMostRecentFocusOwner, getOpacity, getOwnedWindows, getOwner, getOwnerlessWindows, getShape, getToolkit, getType, getWarningString, getWindowFocusListeners, getWindowListeners, getWindows, getWindowStateListeners, hide, isActive, isAlwaysOnTop, isAlwaysOnTopSupported, isAutoRequestFocus, isFocusableWindow, isFocusCycleRoot, isFocused, isLocationByPlatform, isOpaque, isShowing, isValidateRoot, pack, paint, postEvent, processEvent, processWindowEvent, processWindowFocusEvent, processWindowStateEvent, removeNotify, removeWindowFocusListener, removeWindowListener, removeWindowStateListener, reshape, setAlwaysOnTop, setAutoRequestFocus, setBackground, setBounds, setBounds, setCursor, setFocusableWindowState, setFocusCycleRoot, setIconImage, setIconImages, setLocation, setLocation, setLocationByPlatform, setLocationRelativeTo, setMinimumSize, setModalExclusionType, setOpacity, setShape, setSize, setSize, setType, setVisible, show, toBack, toFront`

    - ### Methods inherited from class java.awt.Container

      `add, add, add, add, add, addContainerListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalPolicy, getInsets, getLayout, getMaximumSize, getMinimumSize, getMousePosition, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, transferFocusDownCycle, validate, validateTree`

    - ### Methods inherited from class java.awt.Component

      `action, 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, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, 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, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resize, resize, revalidate, setComponentOrientation, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setMaximumSize, setName, setPreferredSize, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle`

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### rootPane

          protected JRootPane rootPane

      The `JRootPane` instance that manages the `contentPane` and optional `menuBar` for this frame, as well as the `glassPane`.
      See Also:
        `getRootPane()`, `setRootPane(javax.swing.JRootPane)`

    - #### rootPaneCheckingEnabled

          protected boolean rootPaneCheckingEnabled

      If true then calls to `add` and `setLayout` will be forwarded to the `contentPane`. This is initially false, but is set to true when the `JWindow` is constructed.
      See Also:
        `isRootPaneCheckingEnabled()`, `setRootPaneCheckingEnabled(boolean)`, `RootPaneContainer`

    - #### accessibleContext

          protected AccessibleContext accessibleContext

      The accessible context property.

  - ### Constructor Detail

    - #### JWindow

          public JWindow()

      Creates a window with no specified owner. This window will not be focusable.

      This constructor sets the component's locale property to the value returned by `JComponent.getDefaultLocale`.

      Throws:
        `HeadlessException` - if `GraphicsEnvironment.isHeadless()` returns true.
      See Also:
        `GraphicsEnvironment.isHeadless()`, `Window.isFocusableWindow()`, `JComponent.getDefaultLocale()`

    - #### JWindow

          public JWindow(GraphicsConfiguration gc)

      Creates a window with the specified `GraphicsConfiguration` of a screen device. This window will not be focusable.

      This constructor sets the component's locale property to the value returned by `JComponent.getDefaultLocale`.

      Parameters:
        `gc` - the `GraphicsConfiguration` that is used to construct the new window with; if gc is `null`, the system default `GraphicsConfiguration` is assumed
      Throws:
        `HeadlessException` - If `GraphicsEnvironment.isHeadless()` returns true.
        `IllegalArgumentException` - if `gc` is not from a screen device.
      Since:
        1.3
      See Also:
        `GraphicsEnvironment.isHeadless()`, `Window.isFocusableWindow()`, `JComponent.getDefaultLocale()`

    - #### JWindow

          public JWindow(Frame owner)

      Creates a window with the specified owner frame. If `owner` is `null`, the shared owner will be used and this window will not be focusable. Also, this window will not be focusable unless its owner is showing on the screen.

      This constructor sets the component's locale property to the value returned by `JComponent.getDefaultLocale`.

      Parameters:
        `owner` - the frame from which the window is displayed
      Throws:
        `HeadlessException` - if GraphicsEnvironment.isHeadless() returns true.
      See Also:
        `GraphicsEnvironment.isHeadless()`, `Window.isFocusableWindow()`, `JComponent.getDefaultLocale()`

    - #### JWindow

          public JWindow(Window owner)

      Creates a window with the specified owner window. This window will not be focusable unless its owner is showing on the screen. If `owner` is `null`, the shared owner will be used and this window will not be focusable.

      This constructor sets the component's locale property to the value returned by `JComponent.getDefaultLocale`.

      Parameters:
        `owner` - the window from which the window is displayed
      Throws:
        `HeadlessException` - if `GraphicsEnvironment.isHeadless()` returns true.
      See Also:
        `GraphicsEnvironment.isHeadless()`, `Window.isFocusableWindow()`, `JComponent.getDefaultLocale()`

    - #### JWindow

          public JWindow(Window owner,
                         GraphicsConfiguration gc)

      Creates a window with the specified owner window and `GraphicsConfiguration` of a screen device. If `owner` is `null`, the shared owner will be used and this window will not be focusable.

      This constructor sets the component's locale property to the value returned by `JComponent.getDefaultLocale`.

      Parameters:
        `owner` - the window from which the window is displayed
        `gc` - the `GraphicsConfiguration` that is used to construct the new window with; if gc is `null`, the system default `GraphicsConfiguration` is assumed, unless `owner` is also null, in which case the `GraphicsConfiguration` from the shared owner frame will be used.
      Throws:
        `HeadlessException` - if `GraphicsEnvironment.isHeadless()` returns true.
        `IllegalArgumentException` - if `gc` is not from a screen device.
      Since:
        1.3
      See Also:
        `GraphicsEnvironment.isHeadless()`, `Window.isFocusableWindow()`, `JComponent.getDefaultLocale()`

  - ### Method Detail

    - #### windowInit

          protected void windowInit()

      Called by the constructors to init the `JWindow` properly.

    - #### createRootPane

          protected JRootPane createRootPane()

      Called by the constructor methods to create the default `rootPane`.

    - #### isRootPaneCheckingEnabled

          protected boolean isRootPaneCheckingEnabled()

      Returns whether calls to `add` and `setLayout` are forwarded to the `contentPane`.
      Returns:
        true if `add` and `setLayout` are forwarded; false otherwise
      See Also:
        `addImpl(java.awt.Component, java.lang.Object, int)`, `setLayout(java.awt.LayoutManager)`, `setRootPaneCheckingEnabled(boolean)`, `RootPaneContainer`

    - #### setTransferHandler

          public void setTransferHandler(TransferHandler newHandler)

      Sets the `transferHandler` property, which is a mechanism to support transfer of data into this component. Use `null` if the component does not support data transfer operations.

      If the system property `suppressSwingDropSupport` is `false` (the default) and the current drop target on this component is either `null` or not a user-set drop target, this method will change the drop target as follows: If `newHandler` is `null` it will clear the drop target. If not `null` it will install a new `DropTarget`.

      Note: When used with `JWindow`, `TransferHandler` only provides data import capability, as the data export related methods are currently typed to `JComponent`.

      Please see How to Use Drag and Drop and Data Transfer, a section in The Java Tutorial, for more information.

      Parameters:
        `newHandler` - the new `TransferHandler`
      Since:
        1.6
      See Also:
        `TransferHandler`, `getTransferHandler()`, `Component.setDropTarget(java.awt.dnd.DropTarget)`

    - #### getTransferHandler

          public TransferHandler getTransferHandler()

      Gets the `transferHandler` property.
      Returns:
        the value of the `transferHandler` property
      Since:
        1.6
      See Also:
        `TransferHandler`, `setTransferHandler(javax.swing.TransferHandler)`

    - #### update

          public void update(Graphics g)

      Calls `paint(g)`. This method was overridden to prevent an unnecessary call to clear the background.
      Overrides:
        `update` in class `Container`
      Parameters:
        `g` - the `Graphics` context in which to paint
      See Also:
        `Component.update(Graphics)`

    - #### setRootPaneCheckingEnabled

          protected void setRootPaneCheckingEnabled(boolean enabled)

      Sets whether calls to `add` and `setLayout` are forwarded to the `contentPane`.
      Parameters:
        `enabled` - true if `add` and `setLayout` are forwarded, false if they should operate directly on the `JWindow`.
      See Also:
        `addImpl(java.awt.Component, java.lang.Object, int)`, `setLayout(java.awt.LayoutManager)`, `isRootPaneCheckingEnabled()`, `RootPaneContainer`

    - #### addImpl

          protected void addImpl(Component comp,
                                 Object constraints,
                                 int index)

      Adds the specified child `Component`. This method is overridden to conditionally forward calls to the `contentPane`. By default, children are added to the `contentPane` instead of the frame, refer to `RootPaneContainer` for details.
      Overrides:
        `addImpl` in class `Container`
      Parameters:
        `comp` - the component to be enhanced
        `constraints` - the constraints to be respected
        `index` - the index
      Throws:
        `IllegalArgumentException` - if `index` is invalid
        `IllegalArgumentException` - if adding the container's parent to itself
        `IllegalArgumentException` - if adding a window to a container
      See Also:
        `setRootPaneCheckingEnabled(boolean)`, `RootPaneContainer`

    - #### remove

          public void remove(Component comp)

      Removes the specified component from the container. If `comp` is not the `rootPane`, this will forward the call to the `contentPane`. This will do nothing if `comp` is not a child of the `JWindow` or `contentPane`.
      Overrides:
        `remove` in class `Container`
      Parameters:
        `comp` - the component to be removed
      Throws:
        `NullPointerException` - if `comp` is null
      See Also:
        `Container.add(java.awt.Component)`, `RootPaneContainer`

    - #### setLayout

          public void setLayout(LayoutManager manager)

      Sets the `LayoutManager`. Overridden to conditionally forward the call to the `contentPane`. Refer to `RootPaneContainer` for more information.
      Overrides:
        `setLayout` in class `Container`
      Parameters:
        `manager` - the `LayoutManager`
      See Also:
        `setRootPaneCheckingEnabled(boolean)`, `RootPaneContainer`

    - #### getRootPane

          public JRootPane getRootPane()

      Returns the `rootPane` object for this window.
      Specified by:
        `getRootPane` in interface `RootPaneContainer`
      Returns:
        the `rootPane` property for this window
      See Also:
        `setRootPane(javax.swing.JRootPane)`, `RootPaneContainer.getRootPane()`

    - #### setRootPane

          protected void setRootPane(JRootPane root)

      Sets the new `rootPane` object for this window. This method is called by the constructor.
      Parameters:
        `root` - the new `rootPane` property
      See Also:
        `getRootPane()`

    - #### getContentPane

          public Container getContentPane()

      Returns the `Container` which is the `contentPane` for this window.
      Specified by:
        `getContentPane` in interface `RootPaneContainer`
      Returns:
        the `contentPane` property
      See Also:
        `setContentPane(java.awt.Container)`, `RootPaneContainer.getContentPane()`

    - #### setContentPane

          public void setContentPane(Container contentPane)

      Sets the `contentPane` property for this window. This method is called by the constructor.
      Specified by:
        `setContentPane` in interface `RootPaneContainer`
      Parameters:
        `contentPane` - the new `contentPane`
      Throws:
        `IllegalComponentStateException` - (a runtime exception) if the content pane parameter is `null`
      See Also:
        `getContentPane()`, `RootPaneContainer.setContentPane(java.awt.Container)`

    - #### getLayeredPane

          public JLayeredPane getLayeredPane()

      Returns the `layeredPane` object for this window.
      Specified by:
        `getLayeredPane` in interface `RootPaneContainer`
      Returns:
        the `layeredPane` property
      See Also:
        `setLayeredPane(javax.swing.JLayeredPane)`, `RootPaneContainer.getLayeredPane()`

    - #### setLayeredPane

          public void setLayeredPane(JLayeredPane layeredPane)

      Sets the `layeredPane` property. This method is called by the constructor.
      Specified by:
        `setLayeredPane` in interface `RootPaneContainer`
      Parameters:
        `layeredPane` - the new `layeredPane` object
      Throws:
        `IllegalComponentStateException` - (a runtime exception) if the content pane parameter is `null`
      See Also:
        `getLayeredPane()`, `RootPaneContainer.setLayeredPane(javax.swing.JLayeredPane)`

    - #### getGlassPane

          public Component getGlassPane()

      Returns the `glassPane Component` for this window.
      Specified by:
        `getGlassPane` in interface `RootPaneContainer`
      Returns:
        the `glassPane` property
      See Also:
        `setGlassPane(java.awt.Component)`, `RootPaneContainer.getGlassPane()`

    - #### setGlassPane

          public void setGlassPane(Component glassPane)

      Sets the `glassPane` property. This method is called by the constructor.
      Specified by:
        `setGlassPane` in interface `RootPaneContainer`
      Parameters:
        `glassPane` - the `glassPane` object for this window
      See Also:
        `getGlassPane()`, `RootPaneContainer.setGlassPane(java.awt.Component)`

    - #### getGraphics

          public Graphics getGraphics()

      Creates a graphics context for this component. This method will return `null` if this component is currently not displayable.
      Overrides:
        `getGraphics` in class `Component`
      Returns:
        a graphics context for this component, or `null` if it has none
      Since:
        1.6
      See Also:
        `Component.paint(java.awt.Graphics)`

    - #### repaint

          public void repaint(long time,
                              int x,
                              int y,
                              int width,
                              int height)

      Repaints the specified rectangle of this component within `time` milliseconds. Refer to `RepaintManager` for details on how the repaint is handled.
      Overrides:
        `repaint` in class `Component`
      Parameters:
        `time` - maximum time in milliseconds before update
        `x` - the x coordinate
        `y` - the y coordinate
        `width` - the width
        `height` - the height
      Since:
        1.6
      See Also:
        `RepaintManager`

    - #### paramString

          protected String paramString()

      Returns a string representation of this `JWindow`. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be `null`.
      Overrides:
        `paramString` in class `Container`
      Returns:
        a string representation of this `JWindow`

    - #### getAccessibleContext

          public AccessibleContext getAccessibleContext()

      Gets the AccessibleContext associated with this JWindow. For JWindows, the AccessibleContext takes the form of an AccessibleJWindow. A new AccessibleJWindow instance is created if necessary.
      Specified by:
        `getAccessibleContext` in interface `Accessible`
      Overrides:
        `getAccessibleContext` in class `Window`
      Returns:
        an AccessibleJWindow that serves as the AccessibleContext of this JWindow

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