java.lang.Object
- java.awt.Component
- - java.awt.Container
  - - javax.swing.JComponent
    - - javax.swing.JPanel

All Implemented Interfaces:

ImageObserver ， MenuContainer ， Serializable ， Accessible

已知直接子类：

AbstractColorChooserPanel ， JSpinner.DefaultEditor
```
@JavaBean(defaultProperty="UI",
          description="A generic lightweight container.")
public class JPanel
extends JComponent
implements 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 ”一节。
警告： Swing不是线程安全的。有关详细信息，请参阅Swing's Threading Policy 。

警告：此类的序列化对象与将来的Swing版本不兼容。当前的序列化支持适用于运行相同版本的Swing的应用程序之间的短期存储或RMI。从1.4开始，支持所有JavaBeans的长期存储已被添加到java.beans软件包中。请参阅XMLEncoder 。

从以下版本开始：

1.2

另请参见：

Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type	Class	描述
`protected class`	`JPanel.AccessibleJPanel`	该类实现 `JPanel`类的可访问性支持。

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

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

Nested classes/interfaces inherited from class javax.swing.JComponent
JComponent.AccessibleJComponent

Field Summary
- Fields inherited from class java.awt.Component
  accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
- Fields inherited from interface java.awt.image.ImageObserver
  ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
- Fields inherited from class javax.swing.JComponent
  listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW

构造方法摘要

构造方法
Constructor	描述
`JPanel()`	创建一个新的 `JPanel`双缓冲区和流布局。
`JPanel(boolean isDoubleBuffered)`	创建一个新的 `JPanel`与 `FlowLayout`和指定的缓冲策略。
`JPanel(LayoutManager layout)`	使用指定的布局管理器创建一个新的缓冲JPanel
`JPanel(LayoutManager layout, boolean isDoubleBuffered)`	使用指定的布局管理器和缓冲策略创建一个新的JPanel。

方法摘要

所有方法接口方法具体的方法
Modifier and Type	方法	描述
`AccessibleContext`	`getAccessibleContext()`	获取与此JPanel关联的AccessibleContext。
`PanelUI`	`getUI()`	返回渲染此组件的外观和感觉（L＆amp; F）对象。
`String`	`getUIClassID()`	返回一个字符串，它指定呈现此组件的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)`	设置渲染此组件的外观和感觉（L＆F）对象。
`void`	`updateUI()`	将UI属性重新设置为来自当前外观的值。

Methods inherited from class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, requestFocus, requestFocusInWindow, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

Methods inherited from class java.awt.Container
add, add, add, add, add, addContainerListener, addImpl, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setLayout, transferFocusDownCycle, validate, validateTree

Methods inherited from class javax.swing.JComponent
addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setEnabled, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update

Methods inherited from class 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一个新的JPanel。
    
    参数
    
    layout - 要使用的LayoutManager
    
    isDoubleBuffered - 一个布尔值，适用于双缓冲，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一个新的缓冲JPanel
    
    参数
    
    layout - 要使用的LayoutManager
  - JPanel
```
public JPanel(boolean isDoubleBuffered)
```
    创建一个新的JPanel与FlowLayout和指定的缓冲策略。如果isDoubleBuffered为真，则JPanel将使用双缓冲区。
    
    参数
    
    isDoubleBuffered - 一个布尔值，适用于双缓冲，它使用额外的内存空间来实现快速，无闪烁的更新
  - JPanel
```
public JPanel()
```
    创建一个新的 JPanel双缓冲区和流布局。
- 方法详细信息
  - updateUI
```
public void updateUI()
```
    将UI属性重新设置为来自当前外观的值。
    
    重写：
    
    updateUI在 JComponent
    
    另请参见：
    
    JComponent.updateUI()
  - getUI
```
public PanelUI getUI()
```
    返回渲染此组件的外观和感觉（L＆amp; F）对象。
    
    重写：
    
    getUI在 JComponent
    
    结果
    
    提供此组件的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)
```
    设置渲染此组件的外观和感觉（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&amp;F class.")
public String getUIClassID()
```
    返回一个字符串，它指定呈现此组件的L＆F类的名称。
    
    重写：
    
    getUIClassID在 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。该方法仅用于调试目的，并且返回的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 JComponent
    
    结果
    
    这个JPanel的字符串表示。
  - getAccessibleContext
```
@BeanProperty(bound=false)
public AccessibleContext getAccessibleContext()
```
    获取与此JPanel关联的AccessibleContext。对于JPanels，AccessibleContext采用AccessibleJPanel的形式。如有必要，将创建一个新的AccessibleJPanel实例。
    
    Specified by:
    
    getAccessibleContext在接口 Accessible
    
    重写：
    
    getAccessibleContext在 Component
    
    结果
    
    一个AccessibleJPanel作为这个JPanel的AccessibleContext

Class JPanel

Nested Class Summary

Nested classes/interfaces inherited from class java.awt.Component

Nested classes/interfaces inherited from class java.awt.Container

Nested classes/interfaces inherited from class javax.swing.JComponent

Field Summary

Fields inherited from class java.awt.Component

Fields inherited from interface java.awt.image.ImageObserver

Fields inherited from class javax.swing.JComponent

构造方法摘要

方法摘要

Methods inherited from class java.awt.Component

Methods inherited from class java.awt.Container

Methods inherited from class javax.swing.JComponent

Methods inherited from class java.lang.Object

构造方法详细信息

JPanel

JPanel

JPanel

JPanel

方法详细信息

updateUI

getUI

setUI

getUIClassID

paramString

getAccessibleContext