JFrame (Java Platform SE 8 )
Keywords: javax.swing.JFrame class
Date: 2017-07-29

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

      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`.

  See Also:
    `JRootPane`, `setDefaultCloseOperation(int)`, `WindowListener.windowClosing(java.awt.event.WindowEvent)`, `RootPaneContainer`

- - ### Nested Class Summary

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

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

      `Frame.AccessibleAWTFrame`

    - ### 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.
    `static int` | `EXIT_ON_CLOSE` The exit application default window close operation.
    `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.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 inherited from class java.awt.Component

      `BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

    - ### Fields inherited from interface javax.swing.WindowConstants

      `DISPOSE_ON_CLOSE, DO_NOTHING_ON_CLOSE, HIDE_ON_CLOSE`

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

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

  - ### Constructor Summary

    Constructors
    Constructor and 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

    All Methods Static 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`.
    `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` | `setIconImage(Image image)` Sets the image to be displayed as the icon for this window.
    `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 inherited from class java.awt.Frame

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

    - ### Methods inherited from 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, setBounds, setBounds, setCursor, setFocusableWindowState, setFocusCycleRoot, setIconImages, setLocation, setLocation, setLocationByPlatform, setLocationRelativeTo, setMinimumSize, setModalExclusionType, 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, 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`

    - ### Methods inherited from interface java.awt.MenuContainer

      `getFont, postEvent`

- - ### Field Detail

    - #### EXIT_ON_CLOSE

          public static final int EXIT_ON_CLOSE

      The exit application default window close operation. If a window has this set as the close operation and is closed in an applet, a `SecurityException` may be thrown. It is recommended you only use this in an application.

      Since:
        1.3
      See Also:
        Constant Field Values

    - #### 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 Detail

    - #### 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 Detail

    - #### 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`.

    - #### 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

          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 `JFrame`): 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

          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

          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

          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

          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()`

    - #### setIconImage

          public void setIconImage(Image image)

      Sets the image to be displayed as the icon for this window.

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

      The following statement:

               setIconImage(image);

      is equivalent to:

               ArrayList<Image> imageList = new ArrayList<Image>();
               imageList.add(image);
               setIconImages(imageList);

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

      Overrides:
        `setIconImage` in class `Frame`
      Parameters:
        `image` - the icon image to be displayed.
      See Also:
        `Window.setIconImages(java.util.List<? extends java.awt.Image>)`, `Window.getIconImages()`

    - #### 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

          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

          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

          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

          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

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
Copyright © 1993, 2017, Oracle and/or its affiliates. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.