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javax.swing
abstract public class: JComponent [javadoc | source]
java.lang.Object
   java.awt.Component
      java.awt.Container
         javax.swing.JComponent

All Implemented Interfaces:
    HasGetTransferHandler, Serializable, MenuContainer, ImageObserver

The base class for all Swing components except top-level containers. To use a component that inherits from JComponent, you must place the component in a containment hierarchy whose root is a top-level Swing container. Top-level Swing containers -- such as JFrame, JDialog, and JApplet -- are specialized components that provide a place for other Swing components to paint themselves. For an explanation of containment hierarchies, see Swing Components and the Containment Hierarchy, a section in The Java Tutorial.

The JComponent class provides:

For more information on these subjects, see the Swing package description and The Java Tutorial section The JComponent Class.

JComponent and its subclasses document default values for certain properties. For example, JTable documents the default row height as 16. Each JComponent subclass that has a ComponentUI will create the ComponentUI as part of its constructor. In order to provide a particular look and feel each ComponentUI may set properties back on the JComponent that created it. For example, a custom look and feel may require JTables to have a row height of 24. The documented defaults are the value of a property BEFORE the ComponentUI has been installed. If you need a specific value for a particular property you should explicitly set it.

In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

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

Nested Class Summary:
final class  JComponent.ActionStandin  ActionStandin is used as a standin for ActionListeners that are added via registerKeyboardAction
static final class  JComponent.IntVector   
static class  JComponent.KeyboardState   
abstract public class  JComponent.AccessibleJComponent  Inner class of JComponent used to provide default support for accessibility. This class is not meant to be used directly by application developers, but is instead meant only to be subclassed by component developers.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeansTM has been added to the java.beans package. Please see {@link java.beans.XMLEncoder}. 

Field Summary
static  boolean DEBUG_GRAPHICS_LOADED    Set to true when DebugGraphics has been loaded. 
protected transient  ComponentUI ui    The look and feel delegate for this component. 
protected  EventListenerList listenerList    A list of event listeners for this component. 
transient  Component paintingChild    Set in _paintImmediately. Will indicate the child that initiated the painting operation. If paintingChild is opaque, no need to paint any child components after paintingChild. Test used in paintChildren
public static final  int WHEN_FOCUSED    Constant used for registerKeyboardAction that means that the command should be invoked when the component has the focus. 
public static final  int WHEN_ANCESTOR_OF_FOCUSED_COMPONENT    Constant used for registerKeyboardAction that means that the command should be invoked when the receiving component is an ancestor of the focused component or is itself the focused component. 
public static final  int WHEN_IN_FOCUSED_WINDOW    Constant used for registerKeyboardAction that means that the command should be invoked when the receiving component is in the window that has the focus or is itself the focused component. 
public static final  int UNDEFINED_CONDITION    Constant used by some of the APIs to mean that no condition is defined. 
public static final  String TOOL_TIP_TEXT_KEY    The comment to display when the cursor is over the component, also known as a "value tip", "flyover help", or "flyover label". 
static final  RequestFocusController focusController     
protected  AccessibleContext accessibleContext    The AccessibleContext associated with this JComponent
Fields inherited from java.awt.Container:
layoutMgr,  containerListener,  listeningChildren,  listeningBoundsChildren,  descendantsCount,  preserveBackgroundColor,  INCLUDE_SELF,  SEARCH_HEAVYWEIGHTS,  modalComp,  modalAppContext
Fields inherited from java.awt.Component:
peer,  parent,  appContext,  x,  y,  width,  height,  foreground,  background,  font,  peerFont,  cursor,  locale,  bufferStrategy,  ignoreRepaint,  visible,  enabled,  dropTarget,  popups,  focusTraversalKeys,  LOCK,  minSize,  minSizeSet,  prefSize,  prefSizeSet,  maxSize,  maxSizeSet,  componentOrientation,  newEventsOnly,  componentListener,  focusListener,  hierarchyListener,  hierarchyBoundsListener,  keyListener,  mouseListener,  mouseMotionListener,  mouseWheelListener,  inputMethodListener,  windowClosingException,  actionListenerK,  adjustmentListenerK,  componentListenerK,  containerListenerK,  focusListenerK,  itemListenerK,  keyListenerK,  mouseListenerK,  mouseMotionListenerK,  mouseWheelListenerK,  textListenerK,  ownedWindowK,  windowListenerK,  inputMethodListenerK,  hierarchyListenerK,  hierarchyBoundsListenerK,  windowStateListenerK,  windowFocusListenerK,  eventMask,  isInc,  incRate,  TOP_ALIGNMENT,  CENTER_ALIGNMENT,  BOTTOM_ALIGNMENT,  LEFT_ALIGNMENT,  RIGHT_ALIGNMENT,  isPacked,  backgroundEraseDisabled,  eventCache,  accessibleContext
Constructor:
 public JComponent() 
Method from javax.swing.JComponent Summary:
_paintImmediately,   addAncestorListener,   addNotify,   addVetoableChangeListener,   alwaysOnTop,   checkIfChildObscuredBySibling,   clientPropertyChanged,   compWriteObjectNotify,   componentInputMapChanged,   computeVisibleRect,   computeVisibleRect,   contains,   createToolTip,   disable,   dndDone,   dropLocationForPoint,   enable,   firePropertyChange,   firePropertyChange,   firePropertyChange,   fireVetoableChange,   getAccessibleContext,   getActionForKeyStroke,   getActionMap,   getActionMap,   getAlignmentX,   getAlignmentY,   getAncestorListeners,   getAutoscrolls,   getBaseline,   getBaselineResizeBehavior,   getBorder,   getBounds,   getClientProperty,   getComponentGraphics,   getComponentPopupMenu,   getConditionForKeyStroke,   getCreatedDoubleBuffer,   getDebugGraphicsOptions,   getDefaultLocale,   getFontMetrics,   getGraphics,   getGraphicsInvoked,   getHeight,   getInheritsPopupMenu,   getInputMap,   getInputMap,   getInputMap,   getInputVerifier,   getInsets,   getInsets,   getListeners,   getLocation,   getManagingFocusBackwardTraversalKeys,   getManagingFocusForwardTraversalKeys,   getMaximumSize,   getMinimumSize,   getNextFocusableComponent,   getPopupLocation,   getPreferredSize,   getRegisteredKeyStrokes,   getRootPane,   getSize,   getToolTipLocation,   getToolTipText,   getToolTipText,   getTopLevelAncestor,   getTransferHandler,   getUIClassID,   getVerifyInputWhenFocusTarget,   getVetoableChangeListeners,   getVisibleRect,   getWidth,   getWriteObjCounter,   getX,   getY,   grabFocus,   isDoubleBuffered,   isLightweightComponent,   isManagingFocus,   isOpaque,   isOptimizedDrawingEnabled,   isPainting,   isPaintingForPrint,   isPaintingOrigin,   isPaintingTile,   isRequestFocusEnabled,   isValidateRoot,   paint,   paintBorder,   paintChildren,   paintComponent,   paintForceDoubleBuffered,   paintImmediately,   paintImmediately,   paintToOffscreen,   paramString,   print,   printAll,   printBorder,   printChildren,   printComponent,   processComponentKeyEvent,   processKeyBinding,   processKeyBindings,   processKeyBindingsForAllComponents,   processKeyEvent,   processMouseEvent,   processMouseMotionEvent,   putClientProperty,   rectangleIsObscured,   registerKeyboardAction,   registerKeyboardAction,   removeAncestorListener,   removeNotify,   removeVetoableChangeListener,   repaint,   repaint,   requestDefaultFocus,   requestFocus,   requestFocus,   requestFocusInWindow,   requestFocusInWindow,   resetKeyboardActions,   reshape,   revalidate,   safelyGetGraphics,   safelyGetGraphics,   scrollRectToVisible,   setActionMap,   setAlignmentX,   setAlignmentY,   setAutoscrolls,   setBackground,   setBorder,   setComponentPopupMenu,   setCreatedDoubleBuffer,   setDebugGraphicsOptions,   setDefaultLocale,   setDoubleBuffered,   setDropLocation,   setEnabled,   setFocusTraversalKeys,   setFont,   setForeground,   setInheritsPopupMenu,   setInputMap,   setInputVerifier,   setMaximumSize,   setMinimumSize,   setNextFocusableComponent,   setOpaque,   setPaintingChild,   setPreferredSize,   setRequestFocusEnabled,   setToolTipText,   setTransferHandler,   setUI,   setUIProperty,   setVerifyInputWhenFocusTarget,   setVisible,   setWriteObjCounter,   shouldDebugGraphics,   superProcessMouseMotionEvent,   unregisterKeyboardAction,   update,   updateUI
Methods from java.awt.Container:
add,   add,   add,   add,   add,   addContainerListener,   addImpl,   addNotify,   addPropertyChangeListener,   addPropertyChangeListener,   adjustDecendantsOnParent,   adjustDescendants,   adjustListeningChildren,   applyComponentOrientation,   areFocusTraversalKeysSet,   canContainFocusOwner,   checkGD,   clearCurrentFocusCycleRootOnHide,   clearMostRecentFocusOwnerOnHide,   containsFocus,   countComponents,   countHierarchyMembers,   createChildHierarchyEvents,   createHierarchyEvents,   decreaseComponentCount,   deliverEvent,   dispatchEventImpl,   dispatchEventToSelf,   doLayout,   eventEnabled,   findComponentAt,   findComponentAt,   findComponentAt,   findComponentAtImpl,   getAccessibleAt,   getAccessibleChild,   getAccessibleChildrenCount,   getAlignmentX,   getAlignmentY,   getComponent,   getComponentAt,   getComponentAt,   getComponentCount,   getComponentZOrder,   getComponents,   getComponentsSync,   getComponents_NoClientCode,   getContainerListeners,   getDropTargetEventTarget,   getFocusTraversalKeys,   getFocusTraversalPolicy,   getHeavyweightContainer,   getInsets,   getLayout,   getListeners,   getMaximumSize,   getMinimumSize,   getMouseEventTarget,   getMousePosition,   getOpaqueShape,   getPreferredSize,   getTraversalRoot,   hasHeavyweightDescendants,   hasLightweightDescendants,   increaseComponentCount,   initializeFocusTraversalKeys,   insets,   invalidate,   invalidateParent,   invalidateTree,   isAncestorOf,   isFocusCycleRoot,   isFocusCycleRoot,   isFocusTraversalPolicyProvider,   isFocusTraversalPolicySet,   isRecursivelyVisibleUpToHeavyweightContainer,   isSameOrAncestorOf,   isValidateRoot,   layout,   lightweightPaint,   lightweightPrint,   list,   list,   locate,   minimumSize,   mixOnHiding,   mixOnReshaping,   mixOnShowing,   mixOnValidating,   mixOnZOrderChanging,   numListening,   paint,   paintComponents,   paintHeavyweightComponents,   paramString,   postProcessKeyEvent,   postsOldMouseEvents,   preProcessKeyEvent,   preferredSize,   print,   printComponents,   printHeavyweightComponents,   processContainerEvent,   processEvent,   proxyEnableEvents,   recursiveApplyCurrentShape,   recursiveApplyCurrentShape,   recursiveApplyCurrentShape,   recursiveSubtractAndApplyShape,   recursiveSubtractAndApplyShape,   recursiveSubtractAndApplyShape,   remove,   remove,   removeAll,   removeContainerListener,   removeNotify,   setComponentZOrder,   setFocusCycleRoot,   setFocusTraversalKeys,   setFocusTraversalPolicy,   setFocusTraversalPolicyProvider,   setFont,   setLayout,   transferFocusDownCycle,   update,   updateGraphicsData,   validate,   validateTree,   validateUnconditionally
Methods from java.awt.Component:
action,   add,   addComponentListener,   addFocusListener,   addHierarchyBoundsListener,   addHierarchyListener,   addInputMethodListener,   addKeyListener,   addMouseListener,   addMouseMotionListener,   addMouseWheelListener,   addNotify,   addPropertyChangeListener,   addPropertyChangeListener,   adjustListeningChildrenOnParent,   applyComponentOrientation,   applyCompoundShape,   applyCurrentShape,   areBoundsValid,   areFocusTraversalKeysSet,   areInputMethodsEnabled,   autoProcessMouseWheel,   bounds,   canBeFocusOwner,   canBeFocusOwnerRecursively,   checkGD,   checkImage,   checkImage,   checkTreeLock,   checkWindowClosingException,   clearCurrentFocusCycleRootOnHide,   clearMostRecentFocusOwnerOnHide,   coalesceEvents,   constructComponentName,   contains,   contains,   containsFocus,   countHierarchyMembers,   createBufferStrategy,   createBufferStrategy,   createHierarchyEvents,   createImage,   createImage,   createVolatileImage,   createVolatileImage,   deliverEvent,   disable,   disableEvents,   dispatchEvent,   dispatchEventImpl,   dispatchMouseWheelToAncestor,   doLayout,   enable,   enable,   enableEvents,   enableInputMethods,   eventEnabled,   eventTypeEnabled,   findUnderMouseInWindow,   firePropertyChange,   firePropertyChange,   firePropertyChange,   firePropertyChange,   firePropertyChange,   firePropertyChange,   firePropertyChange,   firePropertyChange,   firePropertyChange,   getAccessControlContext,   getAccessibleContext,   getAccessibleIndexInParent,   getAccessibleStateSet,   getAlignmentX,   getAlignmentY,   getBackBuffer,   getBackground,   getBaseline,   getBaselineResizeBehavior,   getBounds,   getBounds,   getBoundsOp,   getBufferStrategy,   getColorModel,   getComponentAt,   getComponentAt,   getComponentListeners,   getComponentOrientation,   getContainer,   getContainingWindow,   getCursor,   getCursor_NoClientCode,   getDropTarget,   getFocusCycleRootAncestor,   getFocusListeners,   getFocusTraversalKeys,   getFocusTraversalKeysEnabled,   getFocusTraversalKeys_NoIDCheck,   getFont,   getFontMetrics,   getFont_NoClientCode,   getForeground,   getGraphics,   getGraphicsConfiguration,   getGraphicsConfiguration_NoClientCode,   getGraphics_NoClientCode,   getHWPeerAboveMe,   getHeight,   getHierarchyBoundsListeners,   getHierarchyListeners,   getIgnoreRepaint,   getInputContext,   getInputMethodListeners,   getInputMethodRequests,   getKeyListeners,   getListeners,   getLocale,   getLocation,   getLocation,   getLocationOnScreen,   getLocationOnScreen_NoTreeLock,   getLocationOnWindow,   getMaximumSize,   getMinimumSize,   getMouseListeners,   getMouseMotionListeners,   getMousePosition,   getMouseWheelListeners,   getName,   getNativeContainer,   getNextFocusCandidate,   getNormalShape,   getObjectLock,   getOpaqueShape,   getParent,   getParent_NoClientCode,   getPeer,   getPreferredSize,   getPropertyChangeListeners,   getPropertyChangeListeners,   getSiblingIndexAbove,   getSiblingIndexBelow,   getSize,   getSize,   getToolkit,   getToolkitImpl,   getTraversalRoot,   getTreeLock,   getWidth,   getX,   getY,   gotFocus,   handleEvent,   hasFocus,   hide,   imageUpdate,   initializeFocusTraversalKeys,   inside,   invalidate,   invalidateIfValid,   invalidateParent,   isAutoFocusTransferOnDisposal,   isBackgroundSet,   isCoalescingEnabled,   isCursorSet,   isDisplayable,   isDoubleBuffered,   isEnabled,   isEnabledImpl,   isFocusCycleRoot,   isFocusOwner,   isFocusTraversable,   isFocusTraversableOverridden,   isFocusable,   isFontSet,   isForegroundSet,   isInstanceOf,   isLightweight,   isMaximumSizeSet,   isMinimumSizeSet,   isMixingNeeded,   isNonOpaqueForMixing,   isOpaque,   isPreferredSizeSet,   isRecursivelyVisible,   isSameOrAncestorOf,   isShowing,   isValid,   isVisible,   isVisible_NoClientCode,   keyDown,   keyUp,   layout,   lightweightPaint,   lightweightPrint,   list,   list,   list,   list,   list,   locate,   location,   lostFocus,   minimumSize,   mixOnHiding,   mixOnReshaping,   mixOnShowing,   mixOnValidating,   mixOnZOrderChanging,   mouseDown,   mouseDrag,   mouseEnter,   mouseExit,   mouseMove,   mouseUp,   move,   nextFocus,   numListening,   paint,   paintAll,   paintHeavyweightComponents,   paramString,   pointRelativeToComponent,   postEvent,   postsOldMouseEvents,   preferredSize,   prepareImage,   prepareImage,   print,   printAll,   printHeavyweightComponents,   processComponentEvent,   processEvent,   processFocusEvent,   processHierarchyBoundsEvent,   processHierarchyEvent,   processInputMethodEvent,   processKeyEvent,   processMouseEvent,   processMouseMotionEvent,   processMouseWheelEvent,   relocateComponent,   remove,   removeComponentListener,   removeFocusListener,   removeHierarchyBoundsListener,   removeHierarchyListener,   removeInputMethodListener,   removeKeyListener,   removeMouseListener,   removeMouseMotionListener,   removeMouseWheelListener,   removeNotify,   removePropertyChangeListener,   removePropertyChangeListener,   repaint,   repaint,   repaint,   repaint,   requestFocus,   requestFocus,   requestFocus,   requestFocus,   requestFocusHelper,   requestFocusHelper,   requestFocusInWindow,   requestFocusInWindow,   requestFocusInWindow,   requestFocusInWindow,   reshape,   resize,   resize,   revalidate,   setAutoFocusTransferOnDisposal,   setBackground,   setBounds,   setBounds,   setBoundsOp,   setComponentOrientation,   setCursor,   setDropTarget,   setEnabled,   setFocusTraversalKeys,   setFocusTraversalKeysEnabled,   setFocusTraversalKeys_NoIDCheck,   setFocusable,   setFont,   setForeground,   setGraphicsConfiguration,   setIgnoreRepaint,   setLocale,   setLocation,   setLocation,   setMaximumSize,   setMinimumSize,   setName,   setPreferredSize,   setRequestFocusController,   setSize,   setSize,   setVisible,   show,   show,   size,   subtractAndApplyShape,   subtractAndApplyShapeBelowMe,   toString,   transferFocus,   transferFocus,   transferFocusBackward,   transferFocusBackward,   transferFocusUpCycle,   update,   updateCursorImmediately,   updateGraphicsData,   updateZOrder,   validate
Methods from java.lang.Object:
clone,   equals,   finalize,   getClass,   hashCode,   notify,   notifyAll,   toString,   wait,   wait,   wait
Method from javax.swing.JComponent Detail:
  void _paintImmediately(int x,
    int y,
    int w,
    int h) 
 public  void addAncestorListener(AncestorListener listener) 
    Registers listener so that it will receive AncestorEvents when it or any of its ancestors move or are made visible or invisible. Events are also sent when the component or its ancestors are added or removed from the containment hierarchy.
 public  void addNotify() 
    Notifies this component that it now has a parent component. When this method is invoked, the chain of parent components is set up with KeyboardAction event listeners. This method is called by the toolkit internally and should not be called directly by programs.
 public synchronized  void addVetoableChangeListener(VetoableChangeListener listener) 
    Adds a VetoableChangeListener to the listener list. The listener is registered for all properties.
 boolean alwaysOnTop() 
    Returns whether this component should be guaranteed to be on top. For example, it would make no sense for Menus to pop up under another component, so they would always return true. Most components will want to return false, hence that is the default.
 boolean checkIfChildObscuredBySibling() 
    Returns true, which implies that before checking if a child should be painted it is first check that the child is not obscured by another sibling. This is only checked if isOptimizedDrawingEnabled returns false.
  void clientPropertyChanged(Object key,
    Object oldValue,
    Object newValue) 
  void compWriteObjectNotify() 
    This is called from Component by way of reflection. Do NOT change the name unless you change the code in Component as well.
  void componentInputMapChanged(ComponentInputMap inputMap) 
    Invoked from ComponentInputMap when its bindings change. If inputMap is the current windowInputMap (or a parent of the window InputMap) the KeyboardManager is notified of the new bindings.
 public  void computeVisibleRect(Rectangle visibleRect) 
    Returns the Component's "visible rect rectangle" - the intersection of the visible rectangles for this component and all of its ancestors. The return value is stored in visibleRect.
 static final  void computeVisibleRect(Component c,
    Rectangle visibleRect) 
    Returns the Component's "visible rect rectangle" - the intersection of the visible rectangles for the component c and all of its ancestors. The return value is stored in visibleRect.
 public boolean contains(int x,
    int y) 
    Gives the UI delegate an opportunity to define the precise shape of this component for the sake of mouse processing.
 public JToolTip createToolTip() 
    Returns the instance of JToolTip that should be used to display the tooltip. Components typically would not override this method, but it can be used to cause different tooltips to be displayed differently.
 public  void disable() 
Deprecated! As - of JDK version 1.1, replaced by java.awt.Component.setEnabled(boolean).

  void dndDone() 
    Called to indicate to this component that DnD is done. Needed by JTree.
 DropLocation dropLocationForPoint(Point p) 
    Calculates a custom drop location for this type of component, representing where a drop at the given point should insert data. null is returned if this component doesn't calculate custom drop locations. In this case, TransferHandler will provide a default DropLocation containing just the point.
 public  void enable() 
Deprecated! As - of JDK version 1.1, replaced by java.awt.Component.setEnabled(boolean).

 public  void firePropertyChange(String propertyName,
    boolean oldValue,
    boolean newValue) 
    Support for reporting bound property changes for boolean properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.
 public  void firePropertyChange(String propertyName,
    int oldValue,
    int newValue) 
    Support for reporting bound property changes for integer properties. This method can be called when a bound property has changed and it will send the appropriate PropertyChangeEvent to any registered PropertyChangeListeners.
 public  void firePropertyChange(String propertyName,
    char oldValue,
    char newValue) 
 protected  void fireVetoableChange(String propertyName,
    Object oldValue,
    Object newValue) throws PropertyVetoException 
    Supports reporting constrained property changes. This method can be called when a constrained property has changed and it will send the appropriate PropertyChangeEvent to any registered VetoableChangeListeners.
 public AccessibleContext getAccessibleContext() 
    Returns the AccessibleContext associated with this JComponent. The method implemented by this base class returns null. Classes that extend JComponent should implement this method to return the AccessibleContext associated with the subclass.
 public ActionListener getActionForKeyStroke(KeyStroke aKeyStroke) 
    Returns the object that will perform the action registered for a given keystroke.
 public final ActionMap getActionMap() 
    Returns the ActionMap used to determine what Action to fire for particular KeyStroke binding. The returned ActionMap, unless otherwise set, will have the ActionMap from the UI set as the parent.
 final ActionMap getActionMap(boolean create) 
    Finds and returns the appropriate ActionMap.
 public float getAlignmentX() 
    Overrides Container.getAlignmentX to return the vertical alignment.
 public float getAlignmentY() 
    Overrides Container.getAlignmentY to return the horizontal alignment.
 public AncestorListener[] getAncestorListeners() 
    Returns an array of all the ancestor listeners registered on this component.
 public boolean getAutoscrolls() 
    Gets the autoscrolls property.
 public int getBaseline(int width,
    int height) 
    Returns the baseline. The baseline is measured from the top of the component. This method is primarily meant for LayoutManagers to align components along their baseline. A return value less than 0 indicates this component does not have a reasonable baseline and that LayoutManagers should not align this component on its baseline.

    This method calls into the ComponentUI method of the same name. If this component does not have a ComponentUI -1 will be returned. If a value >= 0 is returned, then the component has a valid baseline for any size >= the minimum size and getBaselineResizeBehavior can be used to determine how the baseline changes with size.

 public BaselineResizeBehavior getBaselineResizeBehavior() 
    Returns an enum indicating how the baseline of the component changes as the size changes. This method is primarily meant for layout managers and GUI builders.

    This method calls into the ComponentUI method of the same name. If this component does not have a ComponentUI BaselineResizeBehavior.OTHER will be returned. Subclasses should never return null; if the baseline can not be calculated return BaselineResizeBehavior.OTHER. Callers should first ask for the baseline using getBaseline and if a value >= 0 is returned use this method. It is acceptable for this method to return a value other than BaselineResizeBehavior.OTHER even if getBaseline returns a value less than 0.

 public Border getBorder() 
    Returns the border of this component or null if no border is currently set.
 public Rectangle getBounds(Rectangle rv) 
    Stores the bounds of this component into "return value" rv and returns rv. If rv is null a new Rectangle is allocated. This version of getBounds is useful if the caller wants to avoid allocating a new Rectangle object on the heap.
 public final Object getClientProperty(Object key) 
    Returns the value of the property with the specified key. Only properties added with putClientProperty will return a non-null value.
 protected Graphics getComponentGraphics(Graphics g) 
    Returns the graphics object used to paint this component. If DebugGraphics is turned on we create a new DebugGraphics object if necessary. Otherwise we just configure the specified graphics object's foreground and font.
 public JPopupMenu getComponentPopupMenu() 
    Returns JPopupMenu that assigned for this component. If this component does not have a JPopupMenu assigned to it and getInheritsPopupMenu is true, this will return getParent().getComponentPopupMenu() (assuming the parent is valid.)
 public int getConditionForKeyStroke(KeyStroke aKeyStroke) 
    Returns the condition that determines whether a registered action occurs in response to the specified keystroke.

    For Java 2 platform v1.3, a KeyStroke can be associated with more than one condition. For example, 'a' could be bound for the two conditions WHEN_FOCUSED and WHEN_IN_FOCUSED_WINDOW condition.

 boolean getCreatedDoubleBuffer() 
    Returns true if the RepaintManager created the double buffer image from the component.
 public int getDebugGraphicsOptions() 
    Returns the state of graphics debugging.
 public static Locale getDefaultLocale() 
    Returns the default locale used to initialize each JComponent's locale property upon creation. The default locale has "AppContext" scope so that applets (and potentially multiple lightweight applications running in a single VM) can have their own setting. An applet can safely alter its default locale because it will have no affect on other applets (or the browser).
 public FontMetrics getFontMetrics(Font font) 
    Gets the FontMetrics for the specified Font.
 public Graphics getGraphics() 
    Returns this component's graphics context, which lets you draw on a component. Use this method to get a Graphics object and then invoke operations on that object to draw on the component.
 static  void getGraphicsInvoked(Component root) 
 public int getHeight() 
    Returns the current height of this component. This method is preferable to writing component.getBounds().height, or component.getSize().height because it doesn't cause any heap allocations.
 public boolean getInheritsPopupMenu() 
    Returns true if the JPopupMenu should be inherited from the parent.
 public final InputMap getInputMap() 
    Returns the InputMap that is used when the component has focus. This is convenience method for getInputMap(WHEN_FOCUSED).
 public final InputMap getInputMap(int condition) 
    Returns the InputMap that is used during condition.
 final InputMap getInputMap(int condition,
    boolean create) 
    Returns the InputMap to use for condition condition. If the InputMap hasn't been created, and create is true, it will be created.
 public InputVerifier getInputVerifier() 
    Returns the input verifier for this component.
 public Insets getInsets() 
    If a border has been set on this component, returns the border's insets; otherwise calls super.getInsets.
 public Insets getInsets(Insets insets) 
    Returns an Insets object containing this component's inset values. The passed-in Insets object will be reused if possible. Calling methods cannot assume that the same object will be returned, however. All existing values within this object are overwritten. If insets is null, this will allocate a new one.
 public T[] getListeners(Class<T> listenerType) 
    Returns an array of all the objects currently registered as FooListeners upon this JComponent. FooListeners are registered using the addFooListener method.

    You can specify the listenerType argument with a class literal, such as FooListener.class. For example, you can query a JComponent c for its mouse listeners with the following code:

    MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));
    If no such listeners exist, this method returns an empty array.
 public Point getLocation(Point rv) 
    Stores the x,y origin of this component into "return value" rv and returns rv. If rv is null a new Point is allocated. This version of getLocation is useful if the caller wants to avoid allocating a new Point object on the heap.
 static Set<KeyStroke> getManagingFocusBackwardTraversalKeys() 
    Returns the Set of KeyStrokes to use if the component is managing focus for backward focus traversal.
 static Set<KeyStroke> getManagingFocusForwardTraversalKeys() 
    Returns the Set of KeyStrokes to use if the component is managing focus for forward focus traversal.
 public Dimension getMaximumSize() 
    If the maximum size has been set to a non-null value just returns it. If the UI delegate's getMaximumSize method returns a non-null value then return that; otherwise defer to the component's layout manager.
 public Dimension getMinimumSize() 
    If the minimum size has been set to a non-null value just returns it. If the UI delegate's getMinimumSize method returns a non-null value then return that; otherwise defer to the component's layout manager.
 public Component getNextFocusableComponent() 
Deprecated! As - of 1.4, replaced by FocusTraversalPolicy.

    In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

    Returns the Component set by a prior call to setNextFocusableComponent(Component) on this JComponent.

 public Point getPopupLocation(MouseEvent event) 
    Returns the preferred location to display the popup menu in this component's coordinate system. It is up to the look and feel to honor this property, some may choose to ignore it. If {@code null}, the look and feel will choose a suitable location.
 public Dimension getPreferredSize() 
    If the preferredSize has been set to a non-null value just returns it. If the UI delegate's getPreferredSize method returns a non null value then return that; otherwise defer to the component's layout manager.
 public KeyStroke[] getRegisteredKeyStrokes() 
    Returns the KeyStrokes that will initiate registered actions.
 public JRootPane getRootPane() 
    Returns the JRootPane ancestor for this component.
 public Dimension getSize(Dimension rv) 
    Stores the width/height of this component into "return value" rv and returns rv. If rv is null a new Dimension object is allocated. This version of getSize is useful if the caller wants to avoid allocating a new Dimension object on the heap.
 public Point getToolTipLocation(MouseEvent event) 
    Returns the tooltip location in this component's coordinate system. If null is returned, Swing will choose a location. The default implementation returns null.
 public String getToolTipText() 
    Returns the tooltip string that has been set with setToolTipText.
 public String getToolTipText(MouseEvent event) 
    Returns the string to be used as the tooltip for event. By default this returns any string set using setToolTipText. If a component provides more extensive API to support differing tooltips at different locations, this method should be overridden.
 public Container getTopLevelAncestor() 
    Returns the top-level ancestor of this component (either the containing Window or Applet), or null if this component has not been added to any container.
 public TransferHandler getTransferHandler() 
    Gets the transferHandler property.
 public String getUIClassID() 
    Returns the UIDefaults key used to look up the name of the swing.plaf.ComponentUI class that defines the look and feel for this component. Most applications will never need to call this method. Subclasses of JComponent that support pluggable look and feel should override this method to return a UIDefaults key that maps to the ComponentUI subclass that defines their look and feel.
 public boolean getVerifyInputWhenFocusTarget() 
    Returns the value that indicates whether the input verifier for the current focus owner will be called before this component requests focus.
 public synchronized VetoableChangeListener[] getVetoableChangeListeners() 
    Returns an array of all the vetoable change listeners registered on this component.
 public Rectangle getVisibleRect() 
    Returns the Component's "visible rectangle" - the intersection of this component's visible rectangle, new Rectangle(0, 0, getWidth(), getHeight()), and all of its ancestors' visible rectangles.
 public int getWidth() 
    Returns the current width of this component. This method is preferable to writing component.getBounds().width, or component.getSize().width because it doesn't cause any heap allocations.
 static byte getWriteObjCounter(JComponent comp) 
 public int getX() 
    Returns the current x coordinate of the component's origin. This method is preferable to writing component.getBounds().x, or component.getLocation().x because it doesn't cause any heap allocations.
 public int getY() 
    Returns the current y coordinate of the component's origin. This method is preferable to writing component.getBounds().y, or component.getLocation().y because it doesn't cause any heap allocations.
 public  void grabFocus() 
    Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window. This component must be displayable, visible, and focusable for the request to be granted.

    This method is intended for use by focus implementations. Client code should not use this method; instead, it should use requestFocusInWindow().

 public boolean isDoubleBuffered() 
    Returns whether this component should use a buffer to paint.
 public static boolean isLightweightComponent(Component c) 
    Returns true if this component is lightweight, that is, if it doesn't have a native window system peer.
 public boolean isManagingFocus() 
Deprecated! As - of 1.4, replaced by Component.setFocusTraversalKeys(int, Set) and Container.setFocusCycleRoot(boolean).

    In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

    Changes this JComponent's focus traversal keys to CTRL+TAB and CTRL+SHIFT+TAB. Also prevents SortingFocusTraversalPolicy from considering descendants of this JComponent when computing a focus traversal cycle.

 public boolean isOpaque() 
    Returns true if this component is completely opaque.

    An opaque component paints every pixel within its rectangular bounds. A non-opaque component paints only a subset of its pixels or none at all, allowing the pixels underneath it to "show through". Therefore, a component that does not fully paint its pixels provides a degree of transparency.

    Subclasses that guarantee to always completely paint their contents should override this method and return true.

 public boolean isOptimizedDrawingEnabled() 
    Returns true if this component tiles its children -- that is, if it can guarantee that the children will not overlap. The repainting system is substantially more efficient in this common case. JComponent subclasses that can't make this guarantee, such as JLayeredPane, should override this method to return false.
 boolean isPainting() 
    Returns true if this component, or any of its ancestors, are in the processing of painting.
 public final boolean isPaintingForPrint() 
    Returns true if the current painting operation on this component is part of a print operation. This method is useful when you want to customize what you print versus what you show on the screen.

    You can detect changes in the value of this property by listening for property change events on this component with name "paintingForPrint".

    Note: This method provides complimentary functionality to that provided by other high level Swing printing APIs. However, it deals strictly with painting and should not be confused as providing information on higher level print processes. For example, a javax.swing.JTable#print() operation doesn't necessarily result in a continuous rendering of the full component, and the return value of this method can change multiple times during that operation. It is even possible for the component to be painted to the screen while the printing process is ongoing. In such a case, the return value of this method is true when, and only when, the table is being painted as part of the printing process.

 protected boolean isPaintingOrigin() 
    Returns {@code true} if a paint triggered on a child component should cause painting to originate from this Component, or one of its ancestors.

    Calling #repaint or #paintImmediately(int, int, int, int) on a Swing component will result in calling the JComponent#paintImmediately(int, int, int, int) method of the first ancestor which {@code isPaintingOrigin()} returns {@code true}, if there are any.

    {@code JComponent} subclasses that need to be painted when any of their children are repainted should override this method to return {@code true}.

 public boolean isPaintingTile() 
    Returns true if the component is currently painting a tile. If this method returns true, paint will be called again for another tile. This method returns false if you are not painting a tile or if the last tile is painted. Use this method to keep some state you might need between tiles.
 public boolean isRequestFocusEnabled() 
    Returns true if this JComponent should get focus; otherwise returns false.

    Please see How to Use the Focus Subsystem, a section in The Java Tutorial, for more information.

 public boolean isValidateRoot() 
    If this method returns true, revalidate calls by descendants of this component will cause the entire tree beginning with this root to be validated. Returns false by default. JScrollPane overrides this method and returns true.
 public  void paint(Graphics g) 
    Invoked by Swing to draw components. Applications should not invoke paint directly, but should instead use the repaint method to schedule the component for redrawing.

    This method actually delegates the work of painting to three protected methods: paintComponent, paintBorder, and paintChildren. They're called in the order listed to ensure that children appear on top of component itself. Generally speaking, the component and its children should not paint in the insets area allocated to the border. Subclasses can just override this method, as always. A subclass that just wants to specialize the UI (look and feel) delegate's paint method should just override paintComponent.

 protected  void paintBorder(Graphics g) 
    Paints the component's border.

    If you override this in a subclass you should not make permanent changes to the passed in Graphics. For example, you should not alter the clip Rectangle or modify the transform. If you need to do these operations you may find it easier to create a new Graphics from the passed in Graphics and manipulate it.

 protected  void paintChildren(Graphics g) 
    Paints this component's children. If shouldUseBuffer is true, no component ancestor has a buffer and the component children can use a buffer if they have one. Otherwise, one ancestor has a buffer currently in use and children should not use a buffer to paint.
 protected  void paintComponent(Graphics g) 
    Calls the UI delegate's paint method, if the UI delegate is non-null. We pass the delegate a copy of the Graphics object to protect the rest of the paint code from irrevocable changes (for example, Graphics.translate).

    If you override this in a subclass you should not make permanent changes to the passed in Graphics. For example, you should not alter the clip Rectangle or modify the transform. If you need to do these operations you may find it easier to create a new Graphics from the passed in Graphics and manipulate it. Further, if you do not invoker super's implementation you must honor the opaque property, that is if this component is opaque, you must completely fill in the background in a non-opaque color. If you do not honor the opaque property you will likely see visual artifacts.

    The passed in Graphics object might have a transform other than the identify transform installed on it. In this case, you might get unexpected results if you cumulatively apply another transform.

  void paintForceDoubleBuffered(Graphics g) 
 public  void paintImmediately(Rectangle r) 
    Paints the specified region now.
 public  void paintImmediately(int x,
    int y,
    int w,
    int h) 
    Paints the specified region in this component and all of its descendants that overlap the region, immediately.

    It's rarely necessary to call this method. In most cases it's more efficient to call repaint, which defers the actual painting and can collapse redundant requests into a single paint call. This method is useful if one needs to update the display while the current event is being dispatched.

    This method is to be overridden when the dirty region needs to be changed for components that are painting origins.

  void paintToOffscreen(Graphics g,
    int x,
    int y,
    int w,
    int h,
    int maxX,
    int maxY) 
    Paints to the specified graphics. This does not set the clip and it does not adjust the Graphics in anyway, callers must do that first. This method is package-private for RepaintManager.PaintManager and its subclasses to call, it is NOT intended for general use outside of that.
 protected String paramString() 
    Returns a string representation of this JComponent. 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.
 public  void print(Graphics g) 
    Invoke this method to print the component to the specified Graphics. This method will result in invocations of printComponent, printBorder and printChildren. It is recommended that you override one of the previously mentioned methods rather than this one if your intention is to customize the way printing looks. However, it can be useful to override this method should you want to prepare state before invoking the superclass behavior. As an example, if you wanted to change the component's background color before printing, you could do the following:
        public void print(Graphics g) {
            Color orig = getBackground();
            setBackground(Color.WHITE);
    
            // wrap in try/finally so that we always restore the state
            try {
                super.print(g);
            } finally {
                setBackground(orig);
            }
        }
    

    Alternatively, or for components that delegate painting to other objects, you can query during painting whether or not the component is in the midst of a print operation. The isPaintingForPrint method provides this ability and its return value will be changed by this method: to true immediately before rendering and to false immediately after. With each change a property change event is fired on this component with the name "paintingForPrint".

    This method sets the component's state such that the double buffer will not be used: painting will be done directly on the passed in Graphics.

 public  void printAll(Graphics g) 
    Invoke this method to print the component. This method invokes print on the component.
 protected  void printBorder(Graphics g) 
    Prints the component's border. This is implemented to invoke paintBorder on the component. Override this if you wish to print the border differently that it is painted.
 protected  void printChildren(Graphics g) 
    Prints this component's children. This is implemented to invoke paintChildren on the component. Override this if you wish to print the children differently than painting.
 protected  void printComponent(Graphics g) 
    This is invoked during a printing operation. This is implemented to invoke paintComponent on the component. Override this if you wish to add special painting behavior when printing.
 protected  void processComponentKeyEvent(KeyEvent e) 
    Processes any key events that the component itself recognizes. This is called after the focus manager and any interested listeners have been given a chance to steal away the event. This method is called only if the event has not yet been consumed. This method is called prior to the keyboard UI logic.

    This method is implemented to do nothing. Subclasses would normally override this method if they process some key events themselves. If the event is processed, it should be consumed.

 protected boolean processKeyBinding(KeyStroke ks,
    KeyEvent e,
    int condition,
    boolean pressed) 
    Invoked to process the key bindings for ks as the result of the KeyEvent e. This obtains the appropriate InputMap, gets the binding, gets the action from the ActionMap, and then (if the action is found and the component is enabled) invokes notifyAction to notify the action.
 boolean processKeyBindings(KeyEvent e,
    boolean pressed) 
    This is invoked as the result of a KeyEvent that was not consumed by the FocusManager, KeyListeners, or the component. It will first try WHEN_FOCUSED bindings, then WHEN_ANCESTOR_OF_FOCUSED_COMPONENT bindings, and finally WHEN_IN_FOCUSED_WINDOW bindings.
 static boolean processKeyBindingsForAllComponents(KeyEvent e,
    Container container,
    boolean pressed) 
 protected  void processKeyEvent(KeyEvent e) 
    Overrides processKeyEvent to process events. *
 protected  void processMouseEvent(MouseEvent e) 
 protected  void processMouseMotionEvent(MouseEvent e) 
    Processes mouse motion events, such as MouseEvent.MOUSE_DRAGGED.
 public final  void putClientProperty(Object key,
    Object value) 
    Adds an arbitrary key/value "client property" to this component.

    The get/putClientProperty methods provide access to a small per-instance hashtable. Callers can use get/putClientProperty to annotate components that were created by another module. For example, a layout manager might store per child constraints this way. For example:

    componentA.putClientProperty("to the left of", componentB);
    
    If value is null this method will remove the property. Changes to client properties are reported with PropertyChange events. The name of the property (for the sake of PropertyChange events) is key.toString().

    The clientProperty dictionary is not intended to support large scale extensions to JComponent nor should be it considered an alternative to subclassing when designing a new component.

 boolean rectangleIsObscured(int x,
    int y,
    int width,
    int height) 
    If the specified rectangle is completely obscured by any of this component's opaque children then returns true. Only direct children are considered, more distant descendants are ignored. A JComponent is opaque if JComponent.isOpaque() returns true, other lightweight components are always considered transparent, and heavyweight components are always considered opaque.
 public  void registerKeyboardAction(ActionListener anAction,
    KeyStroke aKeyStroke,
    int aCondition) 
    This method is now obsolete, please use a combination of getActionMap() and getInputMap() for similiar behavior.
 public  void registerKeyboardAction(ActionListener anAction,
    String aCommand,
    KeyStroke aKeyStroke,
    int aCondition) 
    This method is now obsolete, please use a combination of getActionMap() and getInputMap() for similiar behavior. For example, to bind the KeyStroke aKeyStroke to the Action anAction now use:
      component.getInputMap().put(aKeyStroke, aCommand);
      component.getActionMap().put(aCommmand, anAction);
    
    The above assumes you want the binding to be applicable for WHEN_FOCUSED. To register bindings for other focus states use the getInputMap method that takes an integer.

    Register a new keyboard action. anAction will be invoked if a key event matching aKeyStroke occurs and aCondition is verified. The KeyStroke object defines a particular combination of a keyboard key and one or more modifiers (alt, shift, ctrl, meta).

    The aCommand will be set in the delivered event if specified.

    The aCondition can be one of:

    WHEN_FOCUSED
    The action will be invoked only when the keystroke occurs while the component has the focus.
    WHEN_IN_FOCUSED_WINDOW
    The action will be invoked when the keystroke occurs while the component has the focus or if the component is in the window that has the focus. Note that the component need not be an immediate descendent of the window -- it can be anywhere in the window's containment hierarchy. In other words, whenever any component in the window has the focus, the action registered with this component is invoked.
    WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
    The action will be invoked when the keystroke occurs while the component has the focus or if the component is an ancestor of the component that has the focus.

    The combination of keystrokes and conditions lets you define high level (semantic) action events for a specified keystroke+modifier combination (using the KeyStroke class) and direct to a parent or child of a component that has the focus, or to the component itself. In other words, in any hierarchical structure of components, an arbitrary key-combination can be immediately directed to the appropriate component in the hierarchy, and cause a specific method to be invoked (usually by way of adapter objects).

    If an action has already been registered for the receiving container, with the same charCode and the same modifiers, anAction will replace the action.

 public  void removeAncestorListener(AncestorListener listener) 
    Unregisters listener so that it will no longer receive AncestorEvents.
 public  void removeNotify() 
    Notifies this component that it no longer has a parent component. When this method is invoked, any KeyboardActions set up in the the chain of parent components are removed. This method is called by the toolkit internally and should not be called directly by programs.
 public synchronized  void removeVetoableChangeListener(VetoableChangeListener listener) 
    Removes a VetoableChangeListener from the listener list. This removes a VetoableChangeListener that was registered for all properties.
 public  void repaint(Rectangle r) 
    Adds the specified region to the dirty region list if the component is showing. The component will be repainted after all of the currently pending events have been dispatched.
 public  void repaint(long tm,
    int x,
    int y,
    int width,
    int height) 
    Adds the specified region to the dirty region list if the component is showing. The component will be repainted after all of the currently pending events have been dispatched.
 public boolean requestDefaultFocus() 
Deprecated! As - of 1.4, replaced by FocusTraversalPolicy.getDefaultComponent(Container).requestFocus()

    In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

    Requests focus on this JComponent's FocusTraversalPolicy's default Component. If this JComponent is a focus cycle root, then its FocusTraversalPolicy is used. Otherwise, the FocusTraversalPolicy of this JComponent's focus-cycle-root ancestor is used.

 public  void requestFocus() 
    Requests that this Component gets the input focus. Refer to Component.requestFocus() for a complete description of this method.

    Note that the use of this method is discouraged because its behavior is platform dependent. Instead we recommend the use of requestFocusInWindow() . If you would like more information on focus, see How to Use the Focus Subsystem, a section in The Java Tutorial.

 public boolean requestFocus(boolean temporary) 
 public boolean requestFocusInWindow() 
 protected boolean requestFocusInWindow(boolean temporary) 
 public  void resetKeyboardActions() 
    Unregisters all the bindings in the first tier InputMaps and ActionMap. This has the effect of removing any local bindings, and allowing the bindings defined in parent InputMap/ActionMaps (the UI is usually defined in the second tier) to persist.
 public  void reshape(int x,
    int y,
    int w,
    int h) 
Deprecated! As - of JDK 5, replaced by Component.setBounds(int, int, int, int).

Moves and resizes this component.

 public  void revalidate() 
    Supports deferred automatic layout.

    Calls invalidate and then adds this component's validateRoot to a list of components that need to be validated. Validation will occur after all currently pending events have been dispatched. In other words after this method is called, the first validateRoot (if any) found when walking up the containment hierarchy of this component will be validated. By default, JRootPane, JScrollPane, and JTextField return true from isValidateRoot.

    This method will automatically be called on this component when a property value changes such that size, location, or internal layout of this component has been affected. This automatic updating differs from the AWT because programs generally no longer need to invoke validate to get the contents of the GUI to update.

 static Graphics safelyGetGraphics(Component c) 
 static Graphics safelyGetGraphics(Component c,
    Component root) 
 public  void scrollRectToVisible(Rectangle aRect) 
    Forwards the scrollRectToVisible() message to the JComponent's parent. Components that can service the request, such as JViewport, override this method and perform the scrolling.
 public final  void setActionMap(ActionMap am) 
    Sets the ActionMap to am. This does not set the parent of the am to be the ActionMap from the UI (if there was one), it is up to the caller to have done this.
 public  void setAlignmentX(float alignmentX) 
    Sets the the vertical alignment.
 public  void setAlignmentY(float alignmentY) 
    Sets the the horizontal alignment.
 public  void setAutoscrolls(boolean autoscrolls) 
    Sets the autoscrolls property. If true mouse dragged events will be synthetically generated when the mouse is dragged outside of the component's bounds and mouse motion has paused (while the button continues to be held down). The synthetic events make it appear that the drag gesture has resumed in the direction established when the component's boundary was crossed. Components that support autoscrolling must handle mouseDragged events by calling scrollRectToVisible with a rectangle that contains the mouse event's location. All of the Swing components that support item selection and are typically displayed in a JScrollPane (JTable, JList, JTree, JTextArea, and JEditorPane) already handle mouse dragged events in this way. To enable autoscrolling in any other component, add a mouse motion listener that calls scrollRectToVisible. For example, given a JPanel, myPanel:
    MouseMotionListener doScrollRectToVisible = new MouseMotionAdapter() {
        public void mouseDragged(MouseEvent e) {
           Rectangle r = new Rectangle(e.getX(), e.getY(), 1, 1);
           ((JPanel)e.getSource()).scrollRectToVisible(r);
       }
    };
    myPanel.addMouseMotionListener(doScrollRectToVisible);
    
    The default value of the autoScrolls property is false.
 public  void setBackground(Color bg) 
    Sets the background color of this component. The background color is used only if the component is opaque, and only by subclasses of JComponent or ComponentUI implementations. Direct subclasses of JComponent must override paintComponent to honor this property.

    It is up to the look and feel to honor this property, some may choose to ignore it.

 public  void setBorder(Border border) 
    Sets the border of this component. The Border object is responsible for defining the insets for the component (overriding any insets set directly on the component) and for optionally rendering any border decorations within the bounds of those insets. Borders should be used (rather than insets) for creating both decorative and non-decorative (such as margins and padding) regions for a swing component. Compound borders can be used to nest multiple borders within a single component.

    Although technically you can set the border on any object that inherits from JComponent, the look and feel implementation of many standard Swing components doesn't work well with user-set borders. In general, when you want to set a border on a standard Swing component other than JPanel or JLabel, we recommend that you put the component in a JPanel and set the border on the JPanel.

    This is a bound property.

 public  void setComponentPopupMenu(JPopupMenu popup) 
    Sets the JPopupMenu for this JComponent. The UI is responsible for registering bindings and adding the necessary listeners such that the JPopupMenu will be shown at the appropriate time. When the JPopupMenu is shown depends upon the look and feel: some may show it on a mouse event, some may enable a key binding.

    If popup is null, and getInheritsPopupMenu returns true, then getComponentPopupMenu will be delegated to the parent. This provides for a way to make all child components inherit the popupmenu of the parent.

    This is a bound property.

  void setCreatedDoubleBuffer(boolean newValue) 
    This is invoked by the RepaintManager if createImage is called on the component.
 public  void setDebugGraphicsOptions(int debugOptions) 
    Enables or disables diagnostic information about every graphics operation performed within the component or one of its children.
 public static  void setDefaultLocale(Locale l) 
    Sets the default locale used to initialize each JComponent's locale property upon creation. The initial value is the VM's default locale. The default locale has "AppContext" scope so that applets (and potentially multiple lightweight applications running in a single VM) can have their own setting. An applet can safely alter its default locale because it will have no affect on other applets (or the browser).
 public  void setDoubleBuffered(boolean aFlag) 
    Sets whether this component should use a buffer to paint. If set to true, all the drawing from this component will be done in an offscreen painting buffer. The offscreen painting buffer will the be copied onto the screen. If a Component is buffered and one of its ancestor is also buffered, the ancestor buffer will be used.
 Object setDropLocation(DropLocation location,
    Object state,
    boolean forDrop) 
    Called to set or clear the drop location during a DnD operation. In some cases, the component may need to use its internal selection temporarily to indicate the drop location. To help facilitate this, this method returns and accepts as a parameter a state object. This state object can be used to store, and later restore, the selection state. Whatever this method returns will be passed back to it in future calls, as the state parameter. If it wants the DnD system to continue storing the same state, it must pass it back every time. Here's how this is used:

    Let's say that on the first call to this method the component decides to save some state (because it is about to use the selection to show a drop index). It can return a state object to the caller encapsulating any saved selection state. On a second call, let's say the drop location is being changed to something else. The component doesn't need to restore anything yet, so it simply passes back the same state object to have the DnD system continue storing it. Finally, let's say this method is messaged with null. This means DnD is finished with this component for now, meaning it should restore state. At this point, it can use the state parameter to restore said state, and of course return null since there's no longer anything to store.

 public  void setEnabled(boolean enabled) 
    Sets whether or not this component is enabled. A component that is enabled may respond to user input, while a component that is not enabled cannot respond to user input. Some components may alter their visual representation when they are disabled in order to provide feedback to the user that they cannot take input.

    Note: Disabling a component does not disable its children.

    Note: Disabling a lightweight component does not prevent it from receiving MouseEvents.

 public  void setFocusTraversalKeys(int id,
    Set<AWTKeyStroke> keystrokes) 
 public  void setFont(Font font) 
    Sets the font for this component.
 public  void setForeground(Color fg) 
    Sets the foreground color of this component. It is up to the look and feel to honor this property, some may choose to ignore it.
 public  void setInheritsPopupMenu(boolean value) 
    Sets whether or not getComponentPopupMenu should delegate to the parent if this component does not have a JPopupMenu assigned to it.

    The default value for this is false, but some JComponent subclasses that are implemented as a number of JComponents may set this to true.

    This is a bound property.

 public final  void setInputMap(int condition,
    InputMap map) 
    Sets the InputMap to use under the condition condition to map. A null value implies you do not want any bindings to be used, even from the UI. This will not reinstall the UI InputMap (if there was one). condition has one of the following values:
    • WHEN_IN_FOCUSED_WINDOW
    • WHEN_FOCUSED
    • WHEN_ANCESTOR_OF_FOCUSED_COMPONENT
    If condition is WHEN_IN_FOCUSED_WINDOW and map is not a ComponentInputMap, an IllegalArgumentException will be thrown. Similarly, if condition is not one of the values listed, an IllegalArgumentException will be thrown.
 public  void setInputVerifier(InputVerifier inputVerifier) 
    Sets the input verifier for this component.
 public  void setMaximumSize(Dimension maximumSize) 
    Sets the maximum size of this component to a constant value. Subsequent calls to getMaximumSize will always return this value; the component's UI will not be asked to compute it. Setting the maximum size to null restores the default behavior.
 public  void setMinimumSize(Dimension minimumSize) 
    Sets the minimum size of this component to a constant value. Subsequent calls to getMinimumSize will always return this value; the component's UI will not be asked to compute it. Setting the minimum size to null restores the default behavior.
 public  void setNextFocusableComponent(Component aComponent) 
Deprecated! As - of 1.4, replaced by FocusTraversalPolicy

    In release 1.4, the focus subsystem was rearchitected. For more information, see How to Use the Focus Subsystem, a section in The Java Tutorial.

    Overrides the default FocusTraversalPolicy for this JComponent's focus traversal cycle by unconditionally setting the specified Component as the next Component in the cycle, and this JComponent as the specified Component's previous Component in the cycle.

 public  void setOpaque(boolean isOpaque) 
    If true the component paints every pixel within its bounds. Otherwise, the component may not paint some or all of its pixels, allowing the underlying pixels to show through.

    The default value of this property is false for JComponent. However, the default value for this property on most standard JComponent subclasses (such as JButton and JTree) is look-and-feel dependent.

  void setPaintingChild(Component paintingChild) 
 public  void setPreferredSize(Dimension preferredSize) 
    Sets the preferred size of this component. If preferredSize is null, the UI will be asked for the preferred size.
 public  void setRequestFocusEnabled(boolean requestFocusEnabled) 
    Provides a hint as to whether or not this JComponent should get focus. This is only a hint, and it is up to consumers that are requesting focus to honor this property. This is typically honored for mouse operations, but not keyboard operations. For example, look and feels could verify this property is true before requesting focus during a mouse operation. This would often times be used if you did not want a mouse press on a JComponent to steal focus, but did want the JComponent to be traversable via the keyboard. If you do not want this JComponent focusable at all, use the setFocusable method instead.

    Please see How to Use the Focus Subsystem, a section in The Java Tutorial, for more information.

 public  void setToolTipText(String text) 
    Registers the text to display in a tool tip. The text displays when the cursor lingers over the component.

    See How to Use Tool Tips in The Java Tutorial for further documentation.

 public  void setTransferHandler(TransferHandler newHandler) 
    Sets the {@code TransferHandler}, which provides support for transfer of data into and out of this component via cut/copy/paste and drag and drop. This may be {@code null} if the component does not support data transfer operations.

    If the new {@code TransferHandler} is not {@code null}, this method also installs a new {@code DropTarget} on the component to activate drop handling through the {@code TransferHandler} and activate any built-in support (such as calculating and displaying potential drop locations). If you do not wish for this component to respond in any way to drops, you can disable drop support entirely either by removing the drop target ({@code setDropTarget(null)}) or by de-activating it ({@code getDropTaget().setActive(false)}).

    If the new {@code TransferHandler} is {@code null}, this method removes the drop target.

    Under two circumstances, this method does not modify the drop target: First, if the existing drop target on this component was explicitly set by the developer to a {@code non-null} value. Second, if the system property {@code suppressSwingDropSupport} is {@code true}. The default value for the system property is {@code false}.

    Please see How to Use Drag and Drop and Data Transfer, a section in The Java Tutorial, for more information.

 protected  void setUI(ComponentUI newUI) 
    Sets the look and feel delegate for this component. JComponent subclasses generally override this method to narrow the argument type. For example, in JSlider:
    public void setUI(SliderUI newUI) {
        super.setUI(newUI);
    }
     

    Additionally JComponent subclasses must provide a getUI method that returns the correct type. For example:

    public SliderUI getUI() {
        return (SliderUI)ui;
    }
    
  void setUIProperty(String propertyName,
    Object value) 
 public  void setVerifyInputWhenFocusTarget(boolean verifyInputWhenFocusTarget) 
    Sets the value to indicate whether input verifier for the current focus owner will be called before this component requests focus. The default is true. Set to false on components such as a Cancel button or a scrollbar, which should activate even if the input in the current focus owner is not "passed" by the input verifier for that component.
 public  void setVisible(boolean aFlag) 
    Makes the component visible or invisible. Overrides Component.setVisible.
 static  void setWriteObjCounter(JComponent comp,
    byte count) 
 int shouldDebugGraphics() 
    Returns true if debug information is enabled for this JComponent or one of its parents.
  void superProcessMouseMotionEvent(MouseEvent e) 
 public  void unregisterKeyboardAction(KeyStroke aKeyStroke) 
    This method is now obsolete. To unregister an existing binding you can either remove the binding from the ActionMap/InputMap, or place a dummy binding the InputMap. Removing the binding from the InputMap allows bindings in parent InputMaps to be active, whereas putting a dummy binding in the InputMap effectively disables the binding from ever happening.

    Unregisters a keyboard action. This will remove the binding from the ActionMap (if it exists) as well as the InputMaps.

 public  void update(Graphics g) 
    Calls paint. Doesn't clear the background but see ComponentUI.update, which is called by paintComponent.
 public  void updateUI() 
    Resets the UI property to a value from the current look and feel. JComponent subclasses must override this method like this:
      public void updateUI() {
         setUI((SliderUI)UIManager.getUI(this);
      }