Class JPanel
- All Implemented Interfaces:
ImageObserver,MenuContainer,Serializable,Accessible
- Direct Known Subclasses:
AbstractColorChooserPanel,JSpinner.DefaultEditor
@JavaBean(defaultProperty="UI",description="A generic lightweight container.")public classJPanelextendsJComponentimplementsAccessible
JPanel is a generic lightweight container. For examples and task-oriented documentation for JPanel, seeHow to Use Panels, a section inThe Java Tutorial.Warning: Swing is not thread safe. For more information seeSwing'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 thejava.beans package. Please seeXMLEncoder.
- Since:
- 1.2
Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionprotected classThis class implements accessibility support for theJPanelclass.Nested classes/interfaces declared in class javax.swing.JComponent
JComponent.AccessibleJComponentNested classes/interfaces declared in class java.awt.Container
Container.AccessibleAWTContainerNested classes/interfaces declared in class java.awt.Component
Component.AccessibleAWTComponent,Component.BaselineResizeBehavior,Component.BltBufferStrategy,Component.FlipBufferStrategyField Summary
Fields declared in class javax.swing.JComponent
listenerList,TOOL_TIP_TEXT_KEY,ui,UNDEFINED_CONDITION,WHEN_ANCESTOR_OF_FOCUSED_COMPONENT,WHEN_FOCUSED,WHEN_IN_FOCUSED_WINDOWFields declared in class java.awt.Component
accessibleContext,BOTTOM_ALIGNMENT,CENTER_ALIGNMENT,LEFT_ALIGNMENT,RIGHT_ALIGNMENT,TOP_ALIGNMENTFields declared in interface java.awt.image.ImageObserver
ABORT,ALLBITS,ERROR,FRAMEBITS,HEIGHT,PROPERTIES,SOMEBITS,WIDTHConstructor Summary
ConstructorsConstructorDescriptionJPanel()Creates a newJPanelwith a double buffer and a flow layout.JPanel(boolean isDoubleBuffered) Creates a newJPanelwithFlowLayoutand the specified buffering strategy.JPanel(LayoutManager layout) Create a new buffered JPanel with the specified layout managerJPanel(LayoutManager layout, boolean isDoubleBuffered) Creates a new JPanel with the specified layout manager and buffering strategy.Method Summary
Modifier and TypeMethodDescriptionGets the AccessibleContext associated with this JPanel.getUI()Returns the look and feel (L&F) object that renders this component.Returns a string that specifies the name of the L&F class that renders this component.protectedStringReturns a string representation of this JPanel.voidSets the look and feel (L&F) object that renders this component.voidupdateUI()Resets the UI property with a value from the current look and feel.Methods declared in class javax.swing.JComponent
addAncestorListener,addNotify,addVetoableChangeListener,computeVisibleRect,contains,createToolTip,disable,enable,firePropertyChange,firePropertyChange,fireVetoableChange,getActionForKeyStroke,getActionMap,getAlignmentX,getAlignmentY,getAncestorListeners,getAutoscrolls,getBaseline,getBaselineResizeBehavior,getBorder,getBounds,getClientProperty,getComponentGraphics,getComponentPopupMenu,getConditionForKeyStroke,getDebugGraphicsOptions,getDefaultLocale,getFontMetrics,getGraphics,getHeight,getInheritsPopupMenu,getInputMap,getInputMap,getInputVerifier,getInsets,getInsets,getListeners,getLocation,getMaximumSize,getMinimumSize,getNextFocusableComponent,getPopupLocation,getPreferredSize,getRegisteredKeyStrokes,getRootPane,getSize,getToolTipLocation,getToolTipText,getToolTipText,getTopLevelAncestor,getTransferHandler,getVerifyInputWhenFocusTarget,getVetoableChangeListeners,getVisibleRect,getWidth,getX,getY,grabFocus,hide,isDoubleBuffered,isLightweightComponent,isManagingFocus,isOpaque,isOptimizedDrawingEnabled,isPaintingForPrint,isPaintingOrigin,isPaintingTile,isRequestFocusEnabled,isValidateRoot,paint,paintBorder,paintChildren,paintComponent,paintImmediately,paintImmediately,print,printAll,printBorder,printChildren,printComponent,processComponentKeyEvent,processKeyBinding,processKeyEvent,processMouseEvent,processMouseMotionEvent,putClientProperty,registerKeyboardAction,registerKeyboardAction,removeAncestorListener,removeNotify,removeVetoableChangeListener,repaint,repaint,requestDefaultFocus,requestFocus,requestFocus,requestFocusInWindow,requestFocusInWindow,resetKeyboardActions,reshape,revalidate,scrollRectToVisible,setActionMap,setAlignmentX,setAlignmentY,setAutoscrolls,setBackground,setBorder,setComponentPopupMenu,setDebugGraphicsOptions,setDefaultLocale,setDoubleBuffered,setEnabled,setFocusTraversalKeys,setFont,setForeground,setInheritsPopupMenu,setInputMap,setInputVerifier,setMaximumSize,setMinimumSize,setNextFocusableComponent,setOpaque,setPreferredSize,setRequestFocusEnabled,setToolTipText,setTransferHandler,setUI,setVerifyInputWhenFocusTarget,setVisible,unregisterKeyboardAction,updateMethods declared in class java.awt.Container
add,add,add,add,add,addContainerListener,addImpl,addPropertyChangeListener,addPropertyChangeListener,applyComponentOrientation,areFocusTraversalKeysSet,countComponents,deliverEvent,doLayout,findComponentAt,findComponentAt,getComponent,getComponentAt,getComponentAt,getComponentCount,getComponents,getComponentZOrder,getContainerListeners,getFocusTraversalKeys,getFocusTraversalPolicy,getLayout,getMousePosition,insets,invalidate,isAncestorOf,isFocusCycleRoot,isFocusCycleRoot,isFocusTraversalPolicyProvider,isFocusTraversalPolicySet,layout,list,list,locate,minimumSize,paintComponents,preferredSize,printComponents,processContainerEvent,processEvent,remove,remove,removeAll,removeContainerListener,setComponentZOrder,setFocusCycleRoot,setFocusTraversalPolicy,setFocusTraversalPolicyProvider,setLayout,transferFocusDownCycle,validate,validateTreeMethods declared in class java.awt.Component
action,add,addComponentListener,addFocusListener,addHierarchyBoundsListener,addHierarchyListener,addInputMethodListener,addKeyListener,addMouseListener,addMouseMotionListener,addMouseWheelListener,bounds,checkImage,checkImage,coalesceEvents,contains,createImage,createImage,createVolatileImage,createVolatileImage,disableEvents,dispatchEvent,enable,enableEvents,enableInputMethods,firePropertyChange,firePropertyChange,firePropertyChange,firePropertyChange,firePropertyChange,firePropertyChange,firePropertyChange,getBackground,getBounds,getColorModel,getComponentListeners,getComponentOrientation,getCursor,getDropTarget,getFocusCycleRootAncestor,getFocusListeners,getFocusTraversalKeysEnabled,getFont,getForeground,getGraphicsConfiguration,getHierarchyBoundsListeners,getHierarchyListeners,getIgnoreRepaint,getInputContext,getInputMethodListeners,getInputMethodRequests,getKeyListeners,getLocale,getLocation,getLocationOnScreen,getMouseListeners,getMouseMotionListeners,getMousePosition,getMouseWheelListeners,getName,getParent,getPropertyChangeListeners,getPropertyChangeListeners,getSize,getToolkit,getTreeLock,gotFocus,handleEvent,hasFocus,imageUpdate,inside,isBackgroundSet,isCursorSet,isDisplayable,isEnabled,isFocusable,isFocusOwner,isFocusTraversable,isFontSet,isForegroundSet,isLightweight,isMaximumSizeSet,isMinimumSizeSet,isPreferredSizeSet,isShowing,isValid,isVisible,keyDown,keyUp,list,list,list,location,lostFocus,mouseDown,mouseDrag,mouseEnter,mouseExit,mouseMove,mouseUp,move,nextFocus,paintAll,postEvent,prepareImage,prepareImage,processComponentEvent,processFocusEvent,processHierarchyBoundsEvent,processHierarchyEvent,processInputMethodEvent,processMouseWheelEvent,remove,removeComponentListener,removeFocusListener,removeHierarchyBoundsListener,removeHierarchyListener,removeInputMethodListener,removeKeyListener,removeMouseListener,removeMouseMotionListener,removeMouseWheelListener,removePropertyChangeListener,removePropertyChangeListener,repaint,repaint,repaint,requestFocus,requestFocus,requestFocusInWindow,resize,resize,setBounds,setBounds,setComponentOrientation,setCursor,setDropTarget,setFocusable,setFocusTraversalKeysEnabled,setIgnoreRepaint,setLocale,setLocation,setLocation,setMixingCutoutShape,setName,setSize,setSize,show,show,size,toString,transferFocus,transferFocusBackward,transferFocusUpCycle
Constructor Details
JPanel
Creates a new JPanel with the specified layout manager and buffering strategy.- Parameters:
layout- the LayoutManager to useisDoubleBuffered- a boolean, true for double-buffering, which uses additional memory space to achieve fast, flicker-free updates
JPanel
Create a new buffered JPanel with the specified layout manager- Parameters:
layout- the LayoutManager to use
JPanel
public JPanel(boolean isDoubleBuffered) Creates a newJPanelwithFlowLayoutand the specified buffering strategy. IfisDoubleBufferedis true, theJPanelwill use a double buffer.- Parameters:
isDoubleBuffered- a boolean, true for double-buffering, which uses additional memory space to achieve fast, flicker-free updates
JPanel
public JPanel()Creates a newJPanelwith a double buffer and a flow layout.
Method Details
updateUI
public void updateUI()Resets the UI property with a value from the current look and feel.- Overrides:
updateUIin classJComponent- See Also:
getUI
Returns the look and feel (L&F) object that renders this component.- Overrides:
getUIin classJComponent- Returns:
- the PanelUI object that renders this component
- Since:
- 1.4
setUI
@BeanProperty(hidden=true,visualUpdate=true,description="The UI object that implements the Component's LookAndFeel.")public void setUI(PanelUI ui) Sets the look and feel (L&F) object that renders this component.- Parameters:
ui- the PanelUI L&F object- Since:
- 1.4
- See Also:
getUIClassID
@BeanProperty(bound=false,expert=true,description="A string that specifies the name of the L&F class.")public String getUIClassID()Returns a string that specifies the name of the L&F class that renders this component.- Overrides:
getUIClassIDin classJComponent- Returns:
- the string "PanelUI"
- See Also:
paramString
Returns a string representation of this JPanel. 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 benull.- Overrides:
paramStringin classJComponent- Returns:
- a string representation of this JPanel.
getAccessibleContext
Gets the AccessibleContext associated with this JPanel. For JPanels, the AccessibleContext takes the form of an AccessibleJPanel. A new AccessibleJPanel instance is created if necessary.- Specified by:
getAccessibleContextin interfaceAccessible- Overrides:
getAccessibleContextin classComponent- Returns:
- an AccessibleJPanel that serves as the AccessibleContext of this JPanel