JComponent类是除顶层容器外所有Swing组件的基类。要使用继承自JComponent 一个组成部分，必须把的容纳层次结构，其根是一个顶层 Swing 容器组件。
类声明
以下是声明的 javax.swing.JComponent类：
public abstract class JComponent extends Container implements Serializable
字段域
以下是java.awt.Component 类的字段：
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protected AccessibleContext accessibleContext -- AccessibleContext 可以带此JComponent。
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protected EventListenerList listenerList -- 此组件的事件侦听器的列表。
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static String TOOL_TIP_TEXT_KEY -- 注释显示当光标在组件上，也被称为 "value tip", "flyover help", 或 "flyover label".
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protected ComponentUI ui -- 此组件代表的外观和风格。
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static int UNDEFINED_CONDITION -- Constant used by some of the APIs to mean that no condition is defined.
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static int WHEN_ANCESTOR_OF_FOCUSED_COMPONENT -- 常数用于registerKeyboardAction，意味着当接收组件是一个聚焦组件的基类，或者本身就是焦点的组件，该命令要调用。
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static int WHEN_FOCUSED -- 常数用于registerKeyboardAction，意味着命令组件具有焦点时要调用。
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static int WHEN_IN_FOCUSED_WINDOW -- 常数用于registerKeyboardAction，意味着当接收组件具有焦点的窗口，或者是本身的重点组成部分，该命令调用。
类构造函数
| S.N. | 构造函数 & 描述 |
|---|---|
| 1 |
JComponent() Default JComponent constructor. |
类方法
| S.N. | 方法 & 描述 |
|---|---|
| 1 |
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. |
| 2 |
void addNotify() Notifies this component that it now has a parent component. |
| 3 |
void addVetoableChangeListener(VetoableChangeListener listener) Adds a VetoableChangeListener to the listener list. |
| 4 |
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. |
| 5 |
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. |
| 6 |
JToolTip createToolTip() Returns the instance of JToolTip that should be used to display the tooltip. |
| 7 |
void disable() Deprecated.As of JDK version 1.1, replaced by java.awt.Component.setEnabled(boolean). |
| 8 |
void enable() Deprecated. As of JDK version 1.1, replaced by java.awt.Component.setEnabled(boolean). |
| 9 |
void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) Support for reporting bound property changes for boolean properties. |
| 10 |
void firePropertyChange(String propertyName, char oldValue, char newValue) Reports a bound property change. |
| 11 |
void firePropertyChange(String propertyName, int oldValue, int newValue) Support for reporting bound property changes for integer properties. |
| 12 |
protected void fireVetoableChange(String propertyName, Object oldValue, Object newValue) Supports reporting constrained property changes. |
| 13 |
AccessibleContext getAccessibleContext() Returns the AccessibleContext associated with this JComponent. |
| 14 |
ActionListener getActionForKeyStroke(KeyStroke aKeyStroke) Returns the object that will perform the action registered for a given keystroke. |
| 15 |
ActionMap getActionMap() Returns the ActionMap used to determine what Action to fire for particular KeyStroke binding. |
| 16 |
float getAlignmentX() Overrides Container.getAlignmentX to return the vertical alignment. |
| 17 |
float getAlignmentY() Overrides Container.getAlignmentY to return the horizontal alignment. |
| 18 |
AncestorListener[] getAncestorListeners() Returns an array of all the ancestor listeners registered on this component. |
| 19 |
boolean getAutoscrolls() Gets the autoscrolls property. |
| 20 |
int getBaseline(int width, int height) Returns the baseline. |
| 21 |
Component.BaselineResizeBehavior getBaselineResizeBehavior() Returns an enum indicating how the baseline of the component changes as the size changes. |
| 22 |
Border getBorder() Returns the border of this component or null if no border is currently set. |
| 23 |
Rectangle getBounds(Rectangle rv) Stores the bounds of this component into "return value" rv and returns rv. |
| 24 |
Object getClientProperty(Object key) Returns the value of the property with the specified key. |
| 25 |
protected Graphics getComponentGraphics(Graphics g) Returns the graphics object used to paint this component. |
| 26 |
JPopupMenu getComponentPopupMenu() Returns JPopupMenu that assigned for this component. |
| 27 |
int getConditionForKeyStroke(KeyStroke aKeyStroke) Returns the condition that determines whether a registered action occurs in response to the specified keystroke. |
| 28 |
int getDebugGraphicsOptions() Returns the state of graphics debugging. |
| 29 |
static Locale getDefaultLocale() Returns the default locale used to initialize each JComponent's locale property upon creation. |
| 30 |
FontMetrics getFontMetrics(Font font) Gets the FontMetrics for the specified Font. |
| 31 |
Graphics getGraphics() Returns this component's graphics context, which lets you draw on a component. |
| 32 |
int getHeight() Returns the current height of this component. |
| 33 |
boolean getInheritsPopupMenu() Returns true if the JPopupMenu should be inherited from the parent. |
| 34 |
InputMap getInputMap() Returns the InputMap that is used when the component has focus. |
| 35 |
InputMap getInputMap(int condition) Returns the InputMap that is used during condition. |
| 36 |
InputVerifier getInputVerifier() Returns the input verifier for this component. |
| 37 |
Insets getInsets() If a border has been set on this component, returns the border's insets; otherwise calls super.getInsets. |
| 38 |
Insets getInsets(Insets insets) Returns an Insets object containing this component's inset values. |
| 39 |
<T extends EventListener> T[] getListeners(Class<T> listenerType) Returns an array of all the objects currently registered as FooListeners upon this JComponent. |
| 40 |
Point getLocation(Point rv) Stores the x,y origin of this component into "return value" rv and returns rv. |
| 41 |
Dimension getMaximumSize() If the maximum size has been set to a non-null value just returns it. |
| 42 |
Dimension getMinimumSize() If the minimum size has been set to a non-null value just returns it. |
| 43 |
Component getNextFocusableComponent() Deprecated. As of 1.4, replaced by FocusTraversalPolicy. |
| 44 |
Point getPopupLocation(MouseEvent event) Returns the preferred location to display the popup menu in this component's coordinate system. |
| 45 |
Dimension getPreferredSize() If the preferredSize has been set to a non-null value just returns it. |
| 46 |
KeyStroke[] getRegisteredKeyStrokes() Returns the KeyStrokes that will initiate registered actions. |
| 47 |
JRootPane getRootPane() Returns the JRootPane ancestor for this component. |
| 48 |
Dimension getSize(Dimension rv) Stores the width/height of this component into "return value" rv and returns rv. |
| 49 |
Point getToolTipLocation(MouseEvent event) Returns the tooltip location in this component's coordinate system. |
| 50 |
String getToolTipText() Returns the tooltip string that has been set with setToolTipText. |
| 51 |
String getToolTipText(MouseEvent event) Returns the string to be used as the tooltip for event. |
| 52 |
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. |
| 53 |
TransferHandler getTransferHandler() Gets the transferHandler property. |
| 54 |
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. |
| 55 |
boolean getVerifyInputWhenFocusTarget() Returns the value that indicates whether the input verifier for the current focus owner will be called before this component requests focus. |
| 56 |
VetoableChangeListener[] getVetoableChangeListeners() Returns an array of all the vetoable change listeners registered on this component. |
| 57 |
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. |
| 58 |
int getWidth() Returns the current width of this component. |
| 59 |
int getX() Returns the current x coordinate of the component's origin. |
| 60 |
int getY() Returns the current y coordinate of the component's origin. |
| 61 |
void grabFocus() Requests that this Component get the input focus, and that this Component's top-level ancestor become the focused Window. |
| 62 |
boolean isDoubleBuffered() Returns whether this component should use a buffer to paint. |
| 63 |
static boolean isLightweightComponent(Component c) Returns true if this component is lightweight, that is, if it doesn't have a native window system peer. |
| 64 |
boolean isManagingFocus() Deprecated.As of 1.4, replaced by Component.setFocusTraversalKeys(int, Set) and Container.setFocusCycleRoot(boolean). |
| 65 |
boolean isOpaque() Returns true if this component is completely opaque. |
| 66 |
boolean isOptimizedDrawingEnabled() Returns true if this component tiles its children -- that is, if it can guarantee that the children will not overlap. |
| 67 |
boolean isPaintingForPrint() Returns true if the current painting operation on this component is part of a print operation. |
| 68 |
boolean isPaintingTile() Returns true if the component is currently painting a tile. |
| 69 |
boolean isRequestFocusEnabled() Returns true if this JComponent should get focus; otherwise returns false. |
| 70 |
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. |
| 71 |
void paint(Graphics g) Invoked by Swing to draw components. |
| 72 |
protected void paintBorder(Graphics g) Paints the component's border. |
| 73 |
protected void paintChildren(Graphics g) Paints this component's children. |
| 74 |
protected void paintComponent(Graphics g) Calls the UI delegate's paint method, if the UI delegate is non-null. |
| 75 |
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. |
| 76 |
void paintImmediately(Rectangle r) Paints the specified region now. |
| 77 |
protected String paramString() Returns a string representation of this JComponent. |
| 78 |
void print(Graphics g) Invoke this method to print the component to the specified Graphics. |
| 79 |
void printAll(Graphics g) Invoke this method to print the component. |
| 80 |
protected void printBorder(Graphics g) Prints the component's border. |
| 81 |
protected void printChildren(Graphics g) Prints this component's children. |
| 82 |
protected void printComponent(Graphics g) This is invoked during a printing operation. |
| 82 |
protected void processComponentKeyEvent(KeyEvent e) Processes any key events that the component itself recognizes. |
| 84 |
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. |
| 85 |
protected void processKeyEvent(KeyEvent e) Overrides processKeyEvent to process events. |
| 86 |
protected void processMouseEvent(MouseEvent e) Processes mouse events occurring on this component by dispatching them to any registered MouseListener objects, refer to Component.processMouseEvent(MouseEvent) for a complete description of this method. |
| 87 |
protected void processMouseMotionEvent(MouseEvent e) Processes mouse motion events, such as MouseEvent.MOUSE_DRAGGED. |
| 88 |
void putClientProperty(Object key, Object value) Adds an arbitrary key/value "client property" to this component. |
| 89 |
void registerKeyboardAction(ActionListener anAction, KeyStroke aKeyStroke, int aCondition) This method is now obsolete, please use a combination of getActionMap() and getInputMap() for similiar behavior. |
| 90 |
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. |
| 91 |
void removeAncestorListener(AncestorListener listener) Unregisters listener so that it will no longer receive AncestorEvents. |
| 92 |
void removeNotify() Notifies this component that it no longer has a parent component. |
| 93 |
void removeVetoableChangeListener(VetoableChangeListener listener) Removes a VetoableChangeListener from the listener list. |
| 94 |
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. |
| 95 |
void repaint(Rectangle r) Adds the specified region to the dirty region list if the component is showing. |
| 96 |
boolean requestDefaultFocus() Deprecated.As of 1.4, replaced by FocusTraversalPolicy.getDefaultComponent(Container).requestFocus() |
| 97 |
void requestFocus() Requests that this Component gets the input focus. |
| 98 |
boolean requestFocus(boolean temporary) Requests that this Component gets the input focus. |
| 99 |
boolean requestFocusInWindow() Requests that this Component gets the input focus. |
| 100 |
protected boolean requestFocusInWindow(boolean temporary) Requests that this Component gets the input focus. |
| 101 |
void resetKeyboardActions() Unregisters all the bindings in the first tier InputMaps and ActionMap. |
| 102 |
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. |
| 103 |
void revalidate() Supports deferred automatic layout. |
| 104 |
void scrollRectToVisible(Rectangle aRect) Forwards the scrollRectToVisible() message to the JComponent's parent. |
| 105 |
void setActionMap(ActionMap am) Sets the ActionMap to am. |
| 106 |
void setAlignmentX(float alignmentX) Sets the the vertical alignment. |
| 107 |
void setAlignmentY(float alignmentY) Sets the the horizontal alignment. |
| 108 |
void setAutoscrolls(boolean autoscrolls) Sets the autoscrolls property. |
| 109 |
void setBackground(Color bg) Sets the background color of this component. |
| 110 |
void setBorder(Border border) Sets the border of this component. |
| 111 |
void setComponentPopupMenu(JPopupMenu popup) Sets the JPopupMenu for this JComponent. |
| 112 |
void setDebugGraphicsOptions(int debugOptions) Enables or disables diagnostic information about every graphics operation performed within the component or one of its children. |
| 113 |
static void setDefaultLocale(Locale l) Sets the default locale used to initialize each JComponent's locale property upon creation. |
| 114 |
void setDoubleBuffered(boolean aFlag) Sets whether this component should use a buffer to paint. |
| 115 |
void setEnabled(boolean enabled) Sets whether or not this component is enabled. |
| 116 |
void setFocusTraversalKeys(int id, Set<? extends AWTKeyStroke> keystrokes) Sets the focus traversal keys for a given traversal operation for this Component. |
| 117 |
void setFont(Font font) Sets the font for this component. |
| 118 |
void setForeground(Color fg) Sets the foreground color of this component. |
| 119 |
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. |
| 120 |
void setInputMap(int condition, InputMap map) Sets the InputMap to use under the condition condition to map. |
| 121 |
void setInputVerifier(InputVerifier inputVerifier) Sets the input verifier for this component. |
| 122 |
void setMaximumSize(Dimension maximumSize) Sets the maximum size of this component to a constant value. |
| 123 |
void setMinimumSize(Dimension minimumSize) Sets the minimum size of this component to a constant value. |
| 124 |
void setNextFocusableComponent(Component aComponent) Deprecated. As of 1.4, replaced by FocusTraversalPolicy |
| 125 |
void setOpaque(boolean isOpaque) If true the component paints every pixel within its bounds. |
| 126 |
void setPreferredSize(Dimension preferredSize) Sets the preferred size of this component. |
| 127 |
void setRequestFocusEnabled(boolean requestFocusEnabled) Provides a hint as to whether or not this JComponent should get focus. |
| 128 |
void setToolTipText(String text) Registers the text to display in a tool tip. |
| 129 |
void setTransferHandler(TransferHandler newHandler) Sets the transferHandler property, which is null if the component does not support data transfer operations. |
| 130 |
protected void setUI(ComponentUI newUI) Sets the look and feel delegate for this component. |
| 131 |
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. |
| 132 |
void setVisible(boolean aFlag) Makes the component visible or invisible. |
| 133 |
void unregisterKeyboardAction(KeyStroke aKeyStroke) This method is now obsolete. |
| 134 |
void update(Graphics g) Calls paint. |
| 135 |
void updateUI() Resets the UI property to a value from the current look and feel. |
方法继承
这个类从以下类继承的方法：
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java.awt.Container
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java.awt.Component
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java.lang.Object