javax.swing
类 JPanel

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

所有已实现的接口：

ImageObserver, MenuContainer, Serializable, Accessible

直接已知子类：

AbstractColorChooserPanel, JSpinner.DefaultEditor

public class JPanel
extends JComponent
implements Accessible

JPanel 是一般轻量级容器。有关 JPanel 的示例和面向任务的文档，请参阅 The Java Tutorial 的 How to Use Panels 一节。

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。当前序列化支持适用于短期存储，或适用于在运行相同 Swing 版本的应用程序之间进行 RMI（Remote Method Invocation，远程方法调用）。从 1.4 版本开始，已在 java.beans 包中添加了支持所有 JavaBeans^TM 长期存储的功能。请参见 XMLEncoder。

嵌套类摘要

protected class

JPanel.AccessibleJPanel 此类实现对 JPanel 类的可访问性支持。

从类 javax.swing.JComponent 继承的嵌套类/接口

JComponent.AccessibleJComponent

从类 java.awt.Container 继承的嵌套类/接口

Container.AccessibleAWTContainer

从类 java.awt.Component 继承的嵌套类/接口

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

字段摘要

从类 javax.swing.JComponent 继承的字段

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

从类 java.awt.Component 继承的字段

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

从接口 java.awt.image.ImageObserver 继承的字段

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

构造方法摘要

JPanel()
创建具有双缓冲和流布局的新 JPanel。

JPanel(boolean isDoubleBuffered)
创建具有 FlowLayout 和指定缓冲策略的新 JPanel。

JPanel(LayoutManager layout)
创建具有指定布局管理器的新缓冲 JPanel。

JPanel(LayoutManager layout, boolean isDoubleBuffered)
创建具有指定布局管理器和缓冲策略的新 JPanel。

方法摘要

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() 返回指定呈现此组件的 L&F 类名的字符串。
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() 利用当前外观的值重置 UI 属性。

从类 javax.swing.JComponent 继承的方法

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, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, 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

从类 java.awt.Container 继承的方法

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, transferFocusBackward, transferFocusDownCycle, validate, validateTree

从类 java.awt.Component 继承的方法

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, 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, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusUpCycle

从类 java.lang.Object 继承的方法

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)

创建具有指定布局管理器和缓冲策略的新 JPanel。

参数：

layout - 要使用的 LayoutManager

isDoubleBuffered - boolean 值，true 表示双缓冲，双缓冲使用更多内存空间实现快速、无闪烁的更新

JPanel

public JPanel(LayoutManager layout)

创建具有指定布局管理器的新缓冲 JPanel。

参数：

layout - 要使用的 LayoutManager

JPanel

public JPanel(boolean isDoubleBuffered)

创建具有 FlowLayout 和指定缓冲策略的新 JPanel。如果 isDoubleBuffered 为 true，则 JPanel 将使用双缓冲。

参数：

isDoubleBuffered - boolean 值，true 表示双缓冲，双缓冲使用更多内存空间实现快速、无闪烁的更新

JPanel

public JPanel()

创建具有双缓冲和流布局的新 JPanel。

方法详细信息

updateUI

public void updateUI()

利用当前外观的值重置 UI 属性。

覆盖：

类 JComponent 中的 updateUI

另请参见：

JComponent.updateUI()

getUI

public PanelUI getUI()

返回呈现此组件的外观 (L&F) 对象。

返回：

呈现此组件的 PanelUI 对象

从以下版本开始：

1.4

setUI

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

public String getUIClassID()

返回指定呈现此组件的 L&F 类名的字符串。

覆盖：

类 JComponent 中的 getUIClassID

返回：

"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。此方法仅在进行调试的时候使用，对于各个实现，所返回字符串的内容和格式可能有所不同。返回的字符串可以为空，但不可以为 null。

覆盖：

类 JComponent 中的 paramString

返回：

此 JPanel 的字符串表示形式。

getAccessibleContext

public AccessibleContext getAccessibleContext()

获取与此 JPanel 关联的 AccessibleContext。对于 JPanel，AccessibleContext 采取 AccessibleJPanel 的形式。必要时要创建新的 AccessibleJPanel 实例。

指定者：

接口 Accessible 中的 getAccessibleContext

覆盖：

类 JComponent 中的 getAccessibleContext

返回：

一个 AccessibleJPanel，它充当此 JPanel 的 AccessibleContext