模块 java.desktop

软件包 javax.swing

Class JPanel

java.lang.Object

java.awt.Component

java.awt.Container

javax.swing.JComponent

javax.swing.JPanel

实现的所有接口

ImageObserver ， MenuContainer ， Serializable ， Accessible

已知直接子类：

AbstractColorChooserPanel ， JSpinner.DefaultEditor

@JavaBean(defaultProperty="UI",          description="A generic lightweight container.")public class JPanelextends JComponentimplements Accessible

JPanel是一个通用的轻量级容器。 有关JPanel的示例和面向任务的文档，请参阅“Java教程”中的 How to Use Panels部分。

警告： Swing不是线程安全的。 有关更多信息，请参阅Swing's Threading Policy 。

警告：此类的序列化对象与以后的Swing版本不兼容。 当前的序列化支持适用于运行相同版本Swing的应用程序之间的短期存储或RMI。 从1.4开始， java.beans软件包中添加了对所有JavaBeans java.beans长期存储的支持。 请参阅XMLEncoder 。

从以下版本开始：

1.2

另请参见：

Serialized Form

嵌套类汇总

嵌套类

变量和类型	类	描述
protected class	JPanel.AccessibleJPanel	此类实现 JPanel类的可访问性支持。

嵌套类/接口声明在类 javax.swing.JComponent

JComponent.AccessibleJComponent

嵌套类/接口声明在类 java.awt.Container

Container.AccessibleAWTContainer

嵌套类/接口声明在类 java.awt.Component

Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy

字段汇总

声明的属性在类 javax.swing.JComponent

listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

声明的属性在类 java.awt.Component

accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields declared in interface java.awt.image.ImageObserver

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

构造方法摘要

构造方法

构造器	描述
JPanel()	使用双缓冲区和流布局创建新的 JPanel 。
JPanel(boolean isDoubleBuffered)	使用 FlowLayout和指定的缓冲策略创建新的 JPanel 。
JPanel(LayoutManager layout)	使用指定的布局管理器创建新的缓冲JPanel
JPanel(LayoutManager layout, boolean isDoubleBuffered)	使用指定的布局管理器和缓冲策略创建新的JPanel。

方法摘要

变量和类型	方法	描述
AccessibleContext	getAccessibleContext()	获取与此JPanel关联的AccessibleContext。
PanelUI	getUI()	返回呈现此组件的外观（L＆F）对象。
String	getUIClassID()	返回一个字符串，该字符串指定呈现此组件的L＆F类的名称。
protected String	paramString()	返回此JPanel的字符串表示形式。
void	setUI(PanelUI ui)	设置呈现此组件的外观（L＆F）对象。
void	updateUI()	使用当前外观中的值重置UI属性。

声明方法的类 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, 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, update

声明方法的类 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, validateTree

声明方法的类 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, hide, 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

声明方法的类 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

构造方法详细信息

JPanel

public JPanel(LayoutManager layout,              boolean isDoubleBuffered)

使用指定的布局管理器和缓冲策略创建新的JPanel。

参数

layout - 要使用的LayoutManager

isDoubleBuffered - 布尔值，对于双缓冲为true，它使用额外的内存空间来实现快速，无闪烁的更新

JPanel

public JPanel(LayoutManager layout)

使用指定的布局管理器创建新的缓冲JPanel

参数

layout - 要使用的LayoutManager

JPanel

public JPanel(boolean isDoubleBuffered)

使用FlowLayout和指定的缓冲策略创建新的JPanel 。 如果isDoubleBuffered为true，则JPanel将使用双缓冲区。

参数

isDoubleBuffered - 布尔值，对于双缓冲为true，它使用额外的内存空间来实现快速，无闪烁的更新

JPanel

public JPanel()

使用双缓冲区和流布局创建新的 JPanel 。

方法详细信息

updateUI

public void updateUI()

使用当前外观中的值重置UI属性。

重写：

updateUI在类 JComponent

另请参见：

JComponent.updateUI()

getUI

public PanelUI getUI()

返回呈现此组件的外观（L＆F）对象。

重写：

getUI在类 JComponent

结果

呈现此组件的PanelUI对象

从以下版本开始：

1.4

setUI

@BeanProperty(hidden=true,              visualUpdate=true,              description="The UI object that implements the Component\'s LookAndFeel.")public void setUI(PanelUI ui)

设置呈现此组件的外观（L＆F）对象。

参数

ui - PanelUI L＆F对象

从以下版本开始：

1.4

另请参见：

UIDefaults.getUI(javax.swing.JComponent)

getUIClassID

@BeanProperty(bound=false,              expert=true,              description="A string that specifies the name of the L&F class.")public String getUIClassID()

返回一个字符串，该字符串指定呈现此组件的L＆F类的名称。

重写：

getUIClassID在类 JComponent

结果

“PanelUI Panel的”

另请参见：

JComponent.getUIClassID() ， UIDefaults.getUI(javax.swing.JComponent)

paramString

protected String paramString()

返回此JPanel的字符串表示形式。 此方法仅用于调试目的，返回字符串的内容和格式可能因实现而异。 返回的字符串可能为空，但可能不是null 。

重写：

paramString在类 JComponent

结果

此JPanel的字符串表示形式。

getAccessibleContext

@BeanProperty(bound=false)public AccessibleContext getAccessibleContext()

获取与此JPanel关联的AccessibleContext。 对于JPanel，AccessibleContext采用AccessibleJPanel的形式。 如有必要，将创建一个新的AccessibleJPanel实例。

Specified by:

getAccessibleContext在界面 Accessible

重写：

getAccessibleContext ，类 Component

结果

一个AccessibleJPanel，用作此JPanel的AccessibleContext