JWindow (Java SE 23 & JDK 23)
Description: declaration: module: java.desktop, package: javax.swing, class: JWindow
Keywords: javax.swing.JWindow class

# 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`

@JavaBean(defaultProperty="accessibleContext", description="A toplevel window which has no system border or controls.") 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`.

Since:
  1.2
See Also:
  - `JRootPane`

- ## Nested Class Summary

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

  ### Nested classes/interfaces declared in class java.awt.Window

  `Window.AccessibleAWTWindow, Window.Type`

  ### Nested classes/interfaces declared in class java.awt.Container

  `Container.AccessibleAWTContainer`

  ### Nested classes/interfaces declared in class java.awt.Component

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

- ## Field Summary

  Fields
  Modifier and Type
  Field
  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 declared in class java.awt.Component

  `BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

  ### Fields declared in interface java.awt.image.ImageObserver

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

- ## Constructor Summary

  Constructors
  Constructor
  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

  Modifier and Type
  Method
  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 declared in 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, 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 declared in 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, removeNotify, setComponentZOrder, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, transferFocusDownCycle, validate, validateTree`

  ### Methods declared in 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, 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, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, resize, resize, revalidate, setComponentOrientation, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setMaximumSize, setMixingCutoutShape, setName, setPreferredSize, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle`

  ### Methods declared in class java.lang.Object

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

- ## Field Details

  - ### 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 Details

  - ### 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 Details

  - ### 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`.
    Returns:
      a new `JRootPane`

  - ### 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

    @BeanProperty(hidden=true, description="Mechanism for transfer of data into the component") 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

    @BeanProperty(hidden=true, description="Whether the add and setLayout methods are forwarded") 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

    @BeanProperty(bound=false, hidden=true, description="the RootPane object for this window.") 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

    @BeanProperty(bound=false, hidden=true, description="The client area of the window where child components are normally inserted.") 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

    @BeanProperty(bound=false, hidden=true, description="The pane which holds the various window layers.") 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

    @BeanProperty(bound=false, hidden=true, description="A transparent pane used for menu rendering.") 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

    @BeanProperty(bound=false) 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