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:

Accessible , ImageObserver , MenuContainer , RootPaneContainer , Serializable , 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 conveniance add and its variants, remove and setLayout have been overridden to forward to the contentPane as necessary. This means you can write: For example, to add a child to an AWT frame you'd write:

       frame.add(child);
 

 
 frame.getContentPane().add(child);
 

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.

For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the JFrame 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 JavaBeans ^TM 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
protected  class	JFrame.AccessibleJFrame           This class implements accessibility support for the JFrame class.

 

Nested classes inherited from class java.awt. Frame
Frame.AccessibleAWTFrame

 

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

 

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

 

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

 

Field Summary
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 cause an exception to be forwarded to the contentPane. thrown.

 

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
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
protected  void	addImpl ( Component  comp, Object           Adds the specified child Component.           By default, children may not be added directly to this component, they must be added to its contentPane instead.
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.
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.
static boolean	isDefaultLookAndFeelDecorated ()           Returns true if newly created JFrames should have their Window decorations provided by the current look and feel.
protected  boolean	isRootPaneCheckingEnabled ()           Returns whether calls to add and setLayout are forwarded cause an exception to the contentPane. be thrown.
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           Removes the specified component from the this container.
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 JFrames 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           Sets the image to be displayed in the minimized icon for this frame.
void	setJMenuBar ( JMenuBar  menubar)           Sets the menubar for this frame.
void	setLayeredPane ( JLayeredPane  layeredPane)           Sets the layeredPane property.
void	setLayout ( LayoutManager           Sets           By default the LayoutManager. layout of this component may not be set, the layout of its contentPane should be set instead.
protected  void	setRootPane ( JRootPane  root)           Sets the rootPane property.
protected  void	setRootPaneCheckingEnabled (boolean enabled)           Sets           Determines whether calls to add and setLayout are forwarded will cause an exception to the contentPane. be thrown.
void	update ( Graphics  g)           Just calls paint(g).

 

Methods inherited from class java.awt. Frame
addNotify , finalize , getCursorType , getExtendedState , getFrames , getIconImage , getMaximizedBounds , getMenuBar , getState , getTitle , isResizable , isUndecorated , remove , removeNotify , setCursor , setExtendedState , setIconImage , setMaximizedBounds , setMenuBar , setResizable , setState , setTitle , setUndecorated

 

Methods inherited from class java.awt. Window

addPropertyChangeListener , addPropertyChangeListener , addWindowFocusListener , addWindowListener , addWindowStateListener , applyResourceBundle , applyResourceBundle , createBufferStrategy , createBufferStrategy , dispose , getBufferStrategy , getFocusableWindowState , getFocusCycleRootAncestor , getFocusOwner , getFocusTraversalKeys , getGraphicsConfiguration , getInputContext , getListeners , getLocale , getMostRecentFocusOwner , getOwnedWindows , getOwner , getToolkit , getWarningString , getWindowFocusListeners , getWindowListeners , getWindowStateListeners , hide , isActive , isAlwaysOnTop , isFocusableWindow , isFocusCycleRoot , isFocused , isLocationByPlatform , isShowing , pack , postEvent , processEvent , processWindowFocusEvent , processWindowStateEvent , removeWindowFocusListener , removeWindowListener , removeWindowStateListener , setAlwaysOnTop , setBounds , setCursor , setFocusableWindowState , setFocusCycleRoot , setLocationByPlatform , 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 , getComponentZOrder , getContainerListeners , getFocusTraversalPolicy , getInsets , getLayout , getMaximumSize , getMinimumSize , getMousePosition , getPreferredSize , insets , invalidate , isAncestorOf , isFocusCycleRoot , isFocusTraversalPolicyProvider , isFocusTraversalPolicySet , layout , list , list , locate , minimumSize , paint , paintComponents , preferredSize , print , printComponents , processContainerEvent , remove , removeAll , removeContainerListener , setComponentZOrder , setFocusTraversalKeys , setFocusTraversalPolicy , setFocusTraversalPolicyProvider , 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 , firePropertyChange , firePropertyChange , firePropertyChange , 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 , 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 , isOpaque , 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 , repaint , requestFocus , requestFocus , requestFocusInWindow , requestFocusInWindow , reshape , resize , resize , setBackground , setBounds , setBounds , setComponentOrientation , setDropTarget , setEnabled , setFocusable , setFocusTraversalKeysEnabled , setForeground , setIgnoreRepaint , setLocale , setLocation , setLocation , setMaximumSize , setMinimumSize , setName , setPreferredSize , setSize , setSize , setVisible , show , size , toString , transferFocus , transferFocusUpCycle

 

Methods inherited from class java.lang. Object
clone , equals , 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. If true then calls to add and setLayout will cause an exception to be thrown. The default is false.

See Also:

isRootPaneCheckingEnabled() , setRootPaneCheckingEnabled(boolean) , RootPaneContainer

accessibleContext

protected AccessibleContext accessibleContext

The accessible context property.

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()

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.

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)

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 cause an exception to the contentPane. be thrown.

Returns:

true if add and setLayout are fowarded; checked; 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 Determines whether calls to add and setLayout are forwarded will cause an exception to the contentPane. be thrown.

Parameters:

enabled - true if add and setLayout are forwarded, false if they should operate directly on the JFrame. enabled - true if checking is to be enabled, which causes the exceptions to be thrown

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 forwad calls to the contentPane. By default, children are added to the contentPane instead of the frame, refer to RootPaneContainer for details. By default, children may not be added directly to 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 respected

index - the index

Throws:

IllegalArgumentException Error - if index is invalid

IllegalArgumentException - if adding the container's parent to itself

IllegalArgumentException - if adding a window to a container - if called with rootPaneChecking true

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. Removes the specified component from this container.

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. 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 LayoutManager

Throws:

Error - if called with rootPaneChecking true

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) 

Description copied from class: Frame

Sets the image to be displayed in the minimized icon for this frame. Not all platforms support the concept of minimizing a window.

Overrides:

setIconImage in class Frame

Parameters:

image - the icon image to be displayed. If this parameter is null then the icon image is set to the default image, which may vary with platform.

See Also:

Frame.getIconImage()

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 hiearchy. 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)

setDefaultLookAndFeelDecorated

public static void setDefaultLookAndFeelDecorated(boolean defaultLookAndFeelDecorated)

Provides a hint as to whether or not newly created JFrames 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 JFrames will have their Window decorations provided by the current LookAndFeel. Otherwise, newly created JFrames 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 JFrames 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