javax.swing

Class JPanel

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

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