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。例如，面向任务的录入，文件看 How to Use Panels，java教程中的一部分。

警告： Swing是线程不安全的。更多信息见Swing's Threading Policy。

警告：序列化该类的对象与以后的Swing版本不兼容。当前的序列化支持适用于短期贮藏或RMI运行相同Swing版本的应用程序之间。为1.4，为所有JavaBeans™长期存储的支持已被添加到java.beans包。请看XMLEncoder。

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected class	JPanel.AccessibleJPanel 这个类实现了对 JPanel类可访问性支持。

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() 创建一个具有双缓冲和流动布局的新 JPanel。
JPanel(boolean isDoubleBuffered) 创建 FlowLayout和指定的缓冲策略的一个新的 JPanel。
JPanel(LayoutManager layout) 创建一个新的具有指定布局管理器缓冲JPanel
JPanel(LayoutManager layout, boolean isDoubleBuffered) 创建具有指定布局管理器和缓冲策略新JPanel。

方法摘要

Modifier and Type	Method and Description
AccessibleContext	getAccessibleContext() 获取与此相关的accessiblecontext JPanel。
PanelUI	getUI() 返回呈现此组件的外观和感觉（L和放大器；F）对象。
String	getUIClassID() 返回一个字符串，指定呈现此组件的“L”和“F”类的名称。
protected String	paramString() 返回此JPanel的字符串表示。
void	setUI(PanelUI ui) 设置呈现此组件的外观和感觉（L和F）对象。
void	updateUI() 重置UI属性从目前看价值和感觉。

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

Constructor Detail

JPanel

public JPanel(LayoutManager layout,
              boolean isDoubleBuffered)

创建具有指定布局管理器和缓冲策略新JPanel。

参数

layout的布局管理器的使用

isDoubleBuffered -布尔，真正的双缓冲，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)

创建一个新的具有指定布局管理器缓冲JPanel

参数

layout的布局管理器的使用

JPanel

public JPanel(boolean isDoubleBuffered)

创建 FlowLayout和指定的缓冲策略的一个新的 JPanel。如果是真的 isDoubleBuffered， JPanel将使用双缓冲区。

参数

isDoubleBuffered -布尔，真正的双缓冲，使用额外的内存空间来实现快速、无闪烁的更新

JPanel

public JPanel()

创建一个具有双缓冲和流动布局的新 JPanel。

方法详细信息

updateUI

public void updateUI()

重置UI属性从目前看价值和感觉。

重写：

updateUI 方法重写，继承类 JComponent

另请参见：

JComponent.updateUI()

getUI

public PanelUI getUI()

返回呈现此组件的外观和感觉（L和放大器；F）对象。

结果

的对象，使得组件”面板- ui

从以下版本开始：

一点四

setUI

public void setUI(PanelUI ui)

设置呈现此组件的外观和感觉（L和F）对象。

参数

ui -”面板- ui L和F的对象

从以下版本开始：

一点四

另请参见：

UIDefaults.getUI(javax.swing.JComponent)

getUIClassID

public String getUIClassID()

返回一个字符串，指定呈现此组件的“L”和“F”类的名称。

重写：

getUIClassID 方法重写，继承类 JComponent

结果

“”面板- ui”

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。此方法仅用于调试目的，返回的字符串的内容和格式可能会在实现过程中有所不同。返回的字符串是空的但可能不 null。

重写：

paramString 方法重写，继承类 JComponent

结果

这个JPanel的字符串表示。

getAccessibleContext

public AccessibleContext getAccessibleContext()

获取与此相关的accessiblecontext JPanel。JPanels的accessiblecontext以一个accessiblejpanel形式。一个新的accessiblejpanel实例被创建时。

Specified by:

getAccessibleContext 接口 Accessible

重写：

getAccessibleContext 方法重写，继承类 Component

结果

一个accessiblejpanel作为这个JPanel accessiblecontext