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## javax.swing
Class JWindow

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

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

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`. From the older `java.awt.Window` object you would normally do something like this:

           window.add(child);

However, using `JWindow` you would code:

           window.getContentPane().add(child);

The same is true of setting `LayoutManager`s, removing components, listing children, etc. All these methods should normally be sent to the `contentPane` instead of the `JWindow` itself. 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.

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.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the `JWindow` key assignments.

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 JavaBeansTM has been added to the `java.beans` package. Please see `XMLEncoder`.

See Also:
  `JRootPane`

Nested Class Summary
`protected class` | `JWindow.AccessibleJWindow` This class implements accessibility support for the `JWindow` class.

Nested classes inherited from class java.awt.Window
``

Nested classes inherited from class java.awt.Container
``

Nested classes inherited from class java.awt.Component
`Component.BltBufferStrategy, Component.FlipBufferStrategy`

Field Summary
`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 cause an exception to be thrown.

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
`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
`protected void` | `addImpl(Component comp, Object constraints, int index)` By default, children may not be added directly to a this component, they must be added to its `contentPane` instead.
`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.
`JLayeredPane` | `getLayeredPane()` Returns the `layeredPane` object for this window.
`JRootPane` | `getRootPane()` Returns the `rootPane` object for this window.
`protected boolean` | `isRootPaneCheckingEnabled()` Returns whether calls to `add` and `setLayout` will cause an exception to be thrown.
`protected String` | `paramString()` Returns a string representation of this `JWindow`.
`void` | `remove(Component comp)` Removes the specified component from this container.
`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)` By default the layout of this component may not be set, the layout of its contentPane should be set instead.
`protected void` | `setRootPane(JRootPane root)` Sets the new `rootPane` object for this window.
`protected void` | `setRootPaneCheckingEnabled(boolean enabled)` Determines whether calls to `add` and `setLayout` will cause an exception to be thrown.
`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, finalize, getBufferStrategy, getFocusableWindowState, getFocusCycleRootAncestor, getFocusOwner, getFocusTraversalKeys, getGraphicsConfiguration, getInputContext, getListeners, getLocale, getMostRecentFocusOwner, getOwnedWindows, getOwner, getToolkit, getWarningString, getWindowFocusListeners, getWindowListeners, getWindowStateListeners, hide, isActive, isFocusableWindow, isFocusCycleRoot, isFocused, isShowing, pack, postEvent, processEvent, processWindowEvent, processWindowFocusEvent, processWindowStateEvent, removeWindowFocusListener, removeWindowListener, removeWindowStateListener, setCursor, setFocusableWindowState, setFocusCycleRoot, setLocationRelativeTo, 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, getContainerListeners, getFocusTraversalPolicy, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, removeAll, removeContainerListener, removeNotify, setFocusTraversalKeys, setFocusTraversalPolicy, setFont, transferFocusBackward, 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, getBackground, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, 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, isOpaque, 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, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, toString, transferFocus, transferFocusUpCycle`

Methods inherited from class java.lang.Object
`clone, equals, 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 cause an exception to be thrown.

  See Also:
    `isRootPaneCheckingEnabled()`, `setRootPaneCheckingEnabled(boolean)`

### 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` will cause an exception to be thrown.

  Returns:
    true if `add` and `setLayout` are checked
  See Also:
    `addImpl(java.awt.Component, java.lang.Object, int)`, `setLayout(java.awt.LayoutManager)`, `setRootPaneCheckingEnabled(boolean)`

### 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)

  Determines whether calls to `add` and `setLayout` will cause an exception to be thrown.

  Parameters:
    `enabled` - a boolean value, true if checking is to be enabled, which cause the exceptions to be thrown
  See Also:
    `addImpl(java.awt.Component, java.lang.Object, int)`, `setLayout(java.awt.LayoutManager)`, `isRootPaneCheckingEnabled()`

### addImpl

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

  By default, children may not be added directly to a this component, they must be added to its `contentPane` instead. For example:

       thisComponent.getContentPane().add(child)

  An attempt to add to directly to this component will cause an runtime exception to be thrown. Subclasses can disable this behavior.

  Overrides:
    `addImpl` in class `Container`
  Parameters:
    `comp` - the component to be enhanced
    `constraints` - the constraints to be enforced on the component
    `index` - the index of the component
  Throws:
    `Error` - if called with `rootPaneChecking` true
  See Also:
    `setRootPaneCheckingEnabled(boolean)`

### remove

    public void remove(Component comp)

  Removes the specified component from this container.

  Overrides:
    `remove` in class `Container`
  Parameters:
    `comp` - the component to be removed
  See Also:
    `Container.add(java.awt.Component)`

### setLayout

    public void setLayout(LayoutManager manager)

  By default the layout of this component may not be set, the layout of its contentPane should be set instead. For example:

       thisComponent.getContentPane().setLayout(new GridLayout(1, 2))

  An attempt to set the layout of this component will cause an runtime exception to be thrown. Subclasses can disable this behavior.

  Overrides:
    `setLayout` in class `Container`
  Parameters:
    `manager` - the layout manager for the window
  Throws:
    `Error` - if called with `rootPaneChecking` true
  See Also:
    `setRootPaneCheckingEnabled(boolean)`

### 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)`

### 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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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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