JPanel (Java Platform SE 8 )

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
```
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 。
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，对所有JavaBeans的长期存储的支持已经添加到java.beans包中。请参阅XMLEncoder 。

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`protected class`	`JPanel.AccessibleJPanel` 这个类实现了可访问性支持 `JPanel`类。

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

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

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

Field Summary
- 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
- 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

构造方法摘要

构造方法
Constructor and Description
`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	Method and Description
`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 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.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 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, getPeer, 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, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle

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，适用于双缓存，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类
    
    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。
    
    结果
    
    提供此组件的PanelUI对象
    
    从以下版本开始：
    
    1.4
  - setUI
```
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
```
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”
    
    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
```
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在界面 Accessible
    
    重写：
    
    getAccessibleContext在 Component
    
    结果
    
    an AccessibleJPanel that serves as the AccessibleContext of this JPanel

Class JPanel

Nested Class Summary

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

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

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

Field Summary

Fields inherited from class javax.swing.JComponent

Fields inherited from class java.awt.Component

Fields inherited from interface java.awt.image.ImageObserver

构造方法摘要

方法摘要

Methods inherited from class javax.swing.JComponent

Methods inherited from class java.awt.Container

Methods inherited from class java.awt.Component

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