JFrame (Java SE 22 & JDK 22)
Description: declaration: module: java.desktop, package: javax.swing, class: JFrame
Keywords: javax.swing.JFrame class

Module java.desktop
Package javax.swing

# Class JFrame

java.lang.Object
java.awt.Component
java.awt.Container
java.awt.Window
java.awt.Frame
javax.swing.JFrame

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

@JavaBean(defaultProperty="JMenuBar", description="A toplevel window which can be minimized to an icon.") public class JFrame extends Frame implements WindowConstants, Accessible, RootPaneContainer
An extended version of `java.awt.Frame` that adds support for the JFC/Swing component architecture. You can find task-oriented documentation about using `JFrame` in The Java Tutorial, in the section How to Make Frames.

The `JFrame` class is slightly incompatible with `Frame`. Like all other JFC/Swing top-level containers, a `JFrame` contains a `JRootPane` as its only child. The content pane provided by the root pane should, as a rule, contain all the non-menu components displayed by the `JFrame`. This is different from the AWT `Frame` case. 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 frame as follows:

           frame.add(child);

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

Unlike a `Frame`, a `JFrame` has some notion of how to respond when the user attempts to close the window. The default behavior is to simply hide the JFrame when the user closes the window. To change the default behavior, you invoke the method `setDefaultCloseOperation(int)`. To make the `JFrame` behave the same as a `Frame` instance, use `setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE)`.

For more information on content panes and other features that root panes provide, see Using Top-Level Containers in The Java Tutorial.

In a multi-screen environment, you can create a `JFrame` on a different screen device. See `Frame` 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`
  - `setDefaultCloseOperation(int)`
  - `WindowListener.windowClosing(java.awt.event.WindowEvent)`
  - `RootPaneContainer`

- ## Nested Class Summary

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

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

  `Frame.AccessibleAWTFrame`

  ### 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.Frame

  `CROSSHAIR_CURSOR, DEFAULT_CURSOR, E_RESIZE_CURSOR, HAND_CURSOR, ICONIFIED, MAXIMIZED_BOTH, MAXIMIZED_HORIZ, MAXIMIZED_VERT, MOVE_CURSOR, N_RESIZE_CURSOR, NE_RESIZE_CURSOR, NORMAL, NW_RESIZE_CURSOR, S_RESIZE_CURSOR, SE_RESIZE_CURSOR, SW_RESIZE_CURSOR, TEXT_CURSOR, W_RESIZE_CURSOR, WAIT_CURSOR`

  ### 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`

  ### Fields declared in interface javax.swing.WindowConstants

  `DISPOSE_ON_CLOSE, DO_NOTHING_ON_CLOSE, EXIT_ON_CLOSE, HIDE_ON_CLOSE`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `JFrame()`
  Constructs a new frame that is initially invisible.
  `JFrame(GraphicsConfiguration gc)`
  Creates a `Frame` in the specified `GraphicsConfiguration` of a screen device and a blank title.
  `JFrame(String title)`
  Creates a new, initially invisible `Frame` with the specified title.
  `JFrame(String title, GraphicsConfiguration gc)`
  Creates a `JFrame` with the specified title and the specified `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`.
  `protected void`
  `frameInit()`
  Called by the constructors to init the `JFrame` properly.
  `AccessibleContext`
  `getAccessibleContext()`
  Gets the AccessibleContext associated with this JFrame.
  `Container`
  `getContentPane()`
  Returns the `contentPane` object for this frame.
  `int`
  `getDefaultCloseOperation()`
  Returns the operation that occurs when the user initiates a "close" on this frame.
  `Component`
  `getGlassPane()`
  Returns the `glassPane` object for this frame.
  `Graphics`
  `getGraphics()`
  Creates a graphics context for this component.
  `JMenuBar`
  `getJMenuBar()`
  Returns the menubar set on this frame.
  `JLayeredPane`
  `getLayeredPane()`
  Returns the `layeredPane` object for this frame.
  `JRootPane`
  `getRootPane()`
  Returns the `rootPane` object for this frame.
  `TransferHandler`
  `getTransferHandler()`
  Gets the `transferHandler` property.
  `static boolean`
  `isDefaultLookAndFeelDecorated()`
  Returns true if newly created `JFrame`s should have their Window decorations provided by the current look and feel.
  `protected boolean`
  `isRootPaneCheckingEnabled()`
  Returns whether calls to `add` and `setLayout` are forwarded to the `contentPane`.
  `protected String`
  `paramString()`
  Returns a string representation of this `JFrame`.
  `protected void`
  `processWindowEvent(WindowEvent e)`
  Processes window events occurring on this component.
  `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.
  `void`
  `setDefaultCloseOperation(int operation)`
  Sets the operation that will happen by default when the user initiates a "close" on this frame.
  `static void`
  `setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated)`
  Provides a hint as to whether or not newly created `JFrame`s should have their Window decorations (such as borders, widgets to close the window, title...) provided by the current look and feel.
  `void`
  `setGlassPane(Component glassPane)`
  Sets the `glassPane` property.
  `void`
  `setJMenuBar(JMenuBar menubar)`
  Sets the menubar for this frame.
  `void`
  `setLayeredPane(JLayeredPane layeredPane)`
  Sets the `layeredPane` property.
  `void`
  `setLayout(LayoutManager manager)`
  Sets the `LayoutManager`.
  `protected void`
  `setRootPane(JRootPane root)`
  Sets the `rootPane` property.
  `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)`
  Just calls `paint(g)`.

  ### Methods declared in class java.awt.Frame

  `addNotify, getCursorType, getExtendedState, getFrames, getIconImage, getMaximizedBounds, getMenuBar, getState, getTitle, isResizable, isUndecorated, remove, removeNotify, setCursor, setExtendedState, setMaximizedBounds, setMenuBar, setResizable, setState, setTitle, setUndecorated`

  ### Methods declared in class java.awt.Window

  `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, 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, 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, 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`

  ### Methods declared in interface java.awt.MenuContainer

  `getFont, postEvent`

- ## 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:
      - `JRootPane`
      - `RootPaneContainer`

  - ### 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 `JFrame` is constructed.
    See Also:
      - `isRootPaneCheckingEnabled()`
      - `setRootPaneCheckingEnabled(boolean)`
      - `RootPaneContainer`

  - ### accessibleContext

    protected AccessibleContext accessibleContext
    The accessible context property.

- ## Constructor Details

  - ### JFrame

    public JFrame() throws HeadlessException
    Constructs a new frame that is initially invisible.

    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()`
      - `Component.setSize(int, int)`
      - `Component.setVisible(boolean)`
      - `JComponent.getDefaultLocale()`

  - ### JFrame

    public JFrame(GraphicsConfiguration gc)
    Creates a `Frame` in the specified `GraphicsConfiguration` of a screen device and a blank title.

    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 `Frame`; if `gc` is `null`, the system default `GraphicsConfiguration` is assumed
    Throws:
      `IllegalArgumentException` - if `gc` is not from a screen device. This exception is always thrown when GraphicsEnvironment.isHeadless() returns true.
    Since:
      1.3
    See Also:
      - `GraphicsEnvironment.isHeadless()`
      - `JComponent.getDefaultLocale()`

  - ### JFrame

    public JFrame(String title) throws HeadlessException
    Creates a new, initially invisible `Frame` with the specified title.

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

    Parameters:
      `title` - the title for the frame
    Throws:
      `HeadlessException` - if GraphicsEnvironment.isHeadless() returns true.
    See Also:
      - `GraphicsEnvironment.isHeadless()`
      - `Component.setSize(int, int)`
      - `Component.setVisible(boolean)`
      - `JComponent.getDefaultLocale()`

  - ### JFrame

    public JFrame(String title, GraphicsConfiguration gc)
    Creates a `JFrame` with the specified title and the specified `GraphicsConfiguration` of a screen device.

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

    Parameters:
      `title` - the title to be displayed in the frame's border. A `null` value is treated as an empty string, "".
      `gc` - the `GraphicsConfiguration` that is used to construct the new `JFrame` with; if `gc` is `null`, the system default `GraphicsConfiguration` is assumed
    Throws:
      `IllegalArgumentException` - if `gc` is not from a screen device. This exception is always thrown when GraphicsEnvironment.isHeadless() returns true.
    Since:
      1.3
    See Also:
      - `GraphicsEnvironment.isHeadless()`
      - `JComponent.getDefaultLocale()`

- ## Method Details

  - ### frameInit

    protected void frameInit()
    Called by the constructors to init the `JFrame` properly.

  - ### createRootPane

    protected JRootPane createRootPane()
    Called by the constructor methods to create the default `rootPane`.
    Returns:
      a new `JRootPane`

  - ### processWindowEvent

    protected void processWindowEvent(WindowEvent e)
    Processes window events occurring on this component. Hides the window or disposes of it, as specified by the setting of the `defaultCloseOperation` property.
    Overrides:
      `processWindowEvent` in class `Window`
    Parameters:
      `e` - the window event
    See Also:
      - `setDefaultCloseOperation(int)`
      - `Window.processWindowEvent(java.awt.event.WindowEvent)`

  - ### setDefaultCloseOperation

    @BeanProperty(preferred=true, enumerationValues={"WindowConstants.DO_NOTHING_ON_CLOSE","WindowConstants.HIDE_ON_CLOSE","WindowConstants.DISPOSE_ON_CLOSE","WindowConstants.EXIT_ON_CLOSE"}, description="The frame\'s default close operation.") public void setDefaultCloseOperation(int operation)
    Sets the operation that will happen by default when the user initiates a "close" on this frame. You must specify one of the following choices:
    - `DO_NOTHING_ON_CLOSE` (defined in `WindowConstants`): Don't do anything; require the program to handle the operation in the `windowClosing` method of a registered `WindowListener` object.
    - `HIDE_ON_CLOSE` (defined in `WindowConstants`): Automatically hide the frame after invoking any registered `WindowListener` objects.
    - `DISPOSE_ON_CLOSE` (defined in `WindowConstants`): Automatically hide and dispose the frame after invoking any registered `WindowListener` objects.
    - `EXIT_ON_CLOSE` (defined in `WindowConstants`): Exit the application using the `System` `exit` method. Use this only in applications.

    The value is set to `HIDE_ON_CLOSE` by default. Changes to the value of this property cause the firing of a property change event, with property name "defaultCloseOperation".

    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.

    Parameters:
      `operation` - the operation which should be performed when the user closes the frame
    Throws:
      `IllegalArgumentException` - if defaultCloseOperation value isn't one of the above valid values
      `SecurityException` - if `EXIT_ON_CLOSE` has been specified and the `SecurityManager` will not allow the caller to invoke `System.exit`
    See Also:
      - `Window.addWindowListener(java.awt.event.WindowListener)`
      - `getDefaultCloseOperation()`
      - `WindowConstants`
      - `Runtime.exit(int)`

  - ### getDefaultCloseOperation

    public int getDefaultCloseOperation()
    Returns the operation that occurs when the user initiates a "close" on this frame.
    Returns:
      an integer indicating the window-close operation
    See Also:
      - `setDefaultCloseOperation(int)`

  - ### 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 `JFrame`, `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)
    Just 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)`

  - ### setJMenuBar

    @BeanProperty(bound=false, hidden=true, description="The menubar for accessing pulldown menus from this frame.") public void setJMenuBar(JMenuBar menubar)
    Sets the menubar for this frame.
    Parameters:
      `menubar` - the menubar being placed in the frame
    See Also:
      - `getJMenuBar()`

  - ### getJMenuBar

    public JMenuBar getJMenuBar()
    Returns the menubar set on this frame.
    Returns:
      the menubar for this frame
    See Also:
      - `setJMenuBar(javax.swing.JMenuBar)`

  - ### 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`

  - ### 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 `JFrame`.
    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 `JFrame` 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 frame.") public JRootPane getRootPane()
    Returns the `rootPane` object for this frame.
    Specified by:
      `getRootPane` in interface `RootPaneContainer`
    Returns:
      the `rootPane` property
    See Also:
      - `setRootPane(javax.swing.JRootPane)`
      - `RootPaneContainer.getRootPane()`

  - ### setRootPane

    protected void setRootPane(JRootPane root)
    Sets the `rootPane` property. This method is called by the constructor.
    Parameters:
      `root` - the `rootPane` object for this frame
    See Also:
      - `getRootPane()`

  - ### getContentPane

    public Container getContentPane()
    Returns the `contentPane` object for this frame.
    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 frame where child components are normally inserted.") public void setContentPane(Container contentPane)
    Sets the `contentPane` property. This method is called by the constructor.

    Swing's painting architecture requires an opaque `JComponent` in the containment hierarchy. This is typically provided by the content pane. If you replace the content pane it is recommended you replace it with an opaque `JComponent`.

    Specified by:
      `setContentPane` in interface `RootPaneContainer`
    Parameters:
      `contentPane` - the `contentPane` object for this frame
    Throws:
      `IllegalComponentStateException` - (a runtime exception) if the content pane parameter is `null`
    See Also:
      - `getContentPane()`
      - `RootPaneContainer.setContentPane(java.awt.Container)`
      - `JRootPane`

  - ### getLayeredPane

    public JLayeredPane getLayeredPane()
    Returns the `layeredPane` object for this frame.
    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 that holds the various frame 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 `layeredPane` object for this frame
    Throws:
      `IllegalComponentStateException` - (a runtime exception) if the layered pane parameter is `null`
    See Also:
      - `getLayeredPane()`
      - `RootPaneContainer.setLayeredPane(javax.swing.JLayeredPane)`

  - ### getGlassPane

    public Component getGlassPane()
    Returns the `glassPane` object for this frame.
    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 frame
    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`

  - ### setDefaultLookAndFeelDecorated

    public static void setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated)
    Provides a hint as to whether or not newly created `JFrame`s should have their Window decorations (such as borders, widgets to close the window, title...) provided by the current look and feel. If `defaultLookAndFeelDecorated` is true, the current `LookAndFeel` supports providing window decorations, and the current window manager supports undecorated windows, then newly created `JFrame`s will have their Window decorations provided by the current `LookAndFeel`. Otherwise, newly created `JFrame`s will have their Window decorations provided by the current window manager.

    You can get the same effect on a single JFrame by doing the following:

            JFrame frame = new JFrame();
            frame.setUndecorated(true);
            frame.getRootPane().setWindowDecorationStyle(JRootPane.FRAME);

    Parameters:
      `defaultLookAndFeelDecorated` - A hint as to whether or not current look and feel should provide window decorations
    Since:
      1.4
    See Also:
      - `LookAndFeel.getSupportsWindowDecorations()`

  - ### isDefaultLookAndFeelDecorated

    public static boolean isDefaultLookAndFeelDecorated()
    Returns true if newly created `JFrame`s should have their Window decorations provided by the current look and feel. This is only a hint, as certain look and feels may not support this feature.
    Returns:
      true if look and feel should provide Window decorations.
    Since:
      1.4

  - ### paramString

    protected String paramString()
    Returns a string representation of this `JFrame`. 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 `Frame`
    Returns:
      a string representation of this `JFrame`

  - ### getAccessibleContext

    public AccessibleContext getAccessibleContext()
    Gets the AccessibleContext associated with this JFrame. For JFrames, the AccessibleContext takes the form of an AccessibleJFrame. A new AccessibleJFrame instance is created if necessary.
    Specified by:
      `getAccessibleContext` in interface `Accessible`
    Overrides:
      `getAccessibleContext` in class `Frame`
    Returns:
      an AccessibleJFrame that serves as the AccessibleContext of this JFrame