Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class JLabel - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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javax.swing
Class JLabel

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--javax.swing.JComponent
                    |
                    +--javax.swing.JLabel

Direct Known Subclasses:: BasicComboBoxRenderer, DefaultListCellRenderer, DefaultTableCellRenderer, DefaultTreeCellRenderer

public class JLabel
extends JComponent
implements SwingConstants, Accessible

A display area for a short text string or an image, or both. A label does not react to input events. As a result, it cannot get the keyboard focus. A label can, however, display a keyboard alternative as a convenience for a nearby component that has a keyboard alternative but can't display it.

A JLabel object can display either text, an image, or both. You can specify where in the label's display area the label's contents are aligned by setting the vertical and horizontal alignment. By default, labels are vertically centered in their display area. Text-only labels are leading edge aligned, by default; image-only labels are horizontally centered, by default.

You can also specify the position of the text relative to the image. By default, text is on the trailing edge of the image, with the text and image vertically aligned.

A label's leading and trailing edge are determined from the value of its ComponentOrientation property. At present, the default ComponentOrientation setting maps the leading edge to left and the trailing edge to right.

Finally, you can use the setIconTextGap method to specify how many pixels should appear between the text and the image. The default is 4 pixels.

See How to Use Labels in The Java Tutorial for further documentation.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. A future release of Swing will provide support for long term persistence.

See Also:: Serialized Form

Inner Class Summary

protected class JLabel.AccessibleJLabel
          The class used to obtain the accessible role for this object.

Inner classes inherited from class javax.swing.JComponent

JComponent.AccessibleJComponent

Field Summary

protected Component labelFor


Fields inherited from class javax.swing.JComponent

accessibleContext, 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

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface javax.swing.SwingConstants

BOTTOM, CENTER, EAST, HORIZONTAL, LEADING, LEFT, NORTH, NORTH_EAST, NORTH_WEST, RIGHT, SOUTH, SOUTH_EAST, SOUTH_WEST, TOP, TRAILING, VERTICAL, WEST

Constructor Summary

JLabel()
          Creates a JLabel instance with no image and with an empty string for the title.

JLabel(Icon image)
          Creates a JLabel instance with the specified image.

JLabel(Icon image, int horizontalAlignment)
          Creates a JLabel instance with the specified image and horizontal alignment.

JLabel(String text)
          Creates a JLabel instance with the specified text.

JLabel(String text, Icon icon, int horizontalAlignment)
          Creates a JLabel instance with the specified text, image, and horizontal alignment.

JLabel(String text, int horizontalAlignment)
          Creates a JLabel instance with the specified text and horizontal alignment.

Method Summary

protected int checkHorizontalKey(int key, String message)
          Verify that key is a legal value for the horizontalAlignment properties.

protected int checkVerticalKey(int key, String message)
          Verify that key is a legal value for the verticalAlignment or verticalTextPosition properties.

AccessibleContext getAccessibleContext()
          Get the AccessibleContext of this object

Icon getDisabledIcon()
          Returns the value of the disabledIcon property if it's been set, If it hasn't been set and the value of the icon property is an ImageIcon, we compute a "grayed out" version of the icon and update the disabledIcon property with that.

int getDisplayedMnemonic()
          Return the keycode that indicates a mnemonic key.

int getHorizontalAlignment()
          Returns the alignment of the label's contents along the X axis.

int getHorizontalTextPosition()
          Returns the horizontal position of the label's text, relative to its image.

Icon getIcon()
          Returns the graphic image (glyph, icon) that the label displays.

int getIconTextGap()
          Returns the amount of space between the text and the icon displayed in this label.

Component getLabelFor()
          Get the component this is labelling.

String getText()
          Returns the text string that the label displays.

LabelUI getUI()
          Returns the L&F object that renders this component.

String getUIClassID()
          Returns a string that specifies the name of the l&f class that renders this component.

int getVerticalAlignment()
          Returns the alignment of the label's contents along the Y axis.

int getVerticalTextPosition()
          Returns the vertical position of the label's text, relative to its image.

protected String paramString()
          Returns a string representation of this JLabel.

void setDisabledIcon(Icon disabledIcon)
          Set the icon to be displayed if this JLabel is "disabled", i.e.

void setDisplayedMnemonic(char aChar)
          Specifies the displayedMnemonic as a char value.

void setDisplayedMnemonic(int key)
          Specify a keycode that indicates a mnemonic key.

void setHorizontalAlignment(int alignment)
          Sets the alignment of the label's contents along the X axis.

void setHorizontalTextPosition(int textPosition)
          Sets the horizontal position of the label's text, relative to its image.

void setIcon(Icon icon)
          Defines the icon this component will display.

void setIconTextGap(int iconTextGap)
          If both the icon and text properties are set, this property defines the space between them.

void setLabelFor(Component c)
          Set the component this is labelling.

void setText(String text)
          Defines the single line of text this component will display.

void setUI(LabelUI ui)
          Sets the L&F object that renders this component.

void setVerticalAlignment(int alignment)
          Sets the alignment of the label's contents along the Y axis.

void setVerticalTextPosition(int textPosition)
          Sets the vertical position of the label's text, relative to its image.

void updateUI()
          Notification from the UIFactory that the L&F has changed.

Methods inherited from class javax.swing.JComponent

addAncestorListener, addNotify, addPropertyChangeListener, addPropertyChangeListener, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getAlignmentX, getAlignmentY, getAutoscrolls, getBorder, getBounds, getClientProperty, getComponentGraphics, getConditionForKeyStroke, getDebugGraphicsOptions, getGraphics, getHeight, getInsets, getInsets, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getVisibleRect, getWidth, getX, getY, grabFocus, hasFocus, isDoubleBuffered, isFocusCycleRoot, isFocusTraversable, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintBorder, paintChildren, paintComponent, paintImmediately, paintImmediately, processComponentKeyEvent, processFocusEvent, processKeyEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setDebugGraphicsOptions, setDoubleBuffered, setEnabled, setFont, setForeground, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setUI, setVisible, unregisterKeyboardAction, update

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getLayout, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setCursor, setLayout, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, getBackground, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hide, imageUpdate, inside, isDisplayable, isEnabled, isLightweight, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processInputMethodEvent, processMouseEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, repaint, repaint, repaint, resize, resize, setBounds, setBounds, setComponentOrientation, setDropTarget, setLocale, setLocation, setLocation, setName, setSize, setSize, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

labelFor

protected Component labelFor

Constructor Detail

JLabel

public JLabel(String text,
              Icon icon,
              int horizontalAlignment)

Creates a JLabel instance with the specified text, image, and horizontal alignment. The label is centered vertically in its display area. The text is on the trailing edge of the image.

Parameters:: text - The text to be displayed by the label.; icon - The image to be displayed by the label.; horizontalAlignment - One of the following constants defined in SwingConstants: LEFT, CENTER, RIGHT, LEADING or TRAILING.

JLabel

public JLabel(String text,
              int horizontalAlignment)

Creates a JLabel instance with the specified text and horizontal alignment. The label is centered vertically in its display area.

Parameters:: text - The text to be displayed by the label.; horizontalAlignment - One of the following constants defined in SwingConstants: LEFT, CENTER, RIGHT, LEADING or TRAILING.

JLabel

public JLabel(String text)

Creates a JLabel instance with the specified text. The label is aligned against the leading edge of its display area, and centered vertically.

Parameters:: text - The text to be displayed by the label.

JLabel

public JLabel(Icon image,
              int horizontalAlignment)

Creates a JLabel instance with the specified image and horizontal alignment. The label is centered vertically in its display area.

Parameters:: icon - The image to be displayed by the label.; horizontalAlignment - One of the following constants defined in SwingConstants: LEFT, CENTER, RIGHT, LEADING or TRAILING.

JLabel

public JLabel(Icon image)

Creates a JLabel instance with the specified image. The label is centered vertically and horizontally in its display area.

Parameters:: icon - The image to be displayed by the label.

JLabel

public JLabel()

Creates a JLabel instance with no image and with an empty string for the title. The label is centered vertically in its display area. The label's contents, once set, will be displayed on the leading edge of the label's display area.

Method Detail

getUI

public LabelUI getUI()

Returns the L&F object that renders this component.

Returns:: LabelUI object

setUI

public void setUI(LabelUI ui)

Sets the L&F object that renders this component.

Parameters:: ui - the LabelUI L&F object
See Also:: UIDefaults.getUI(javax.swing.JComponent)

updateUI

public void updateUI()

Notification from the UIFactory that the L&F has changed.

Overrides:: updateUI in class JComponent

See Also:: JComponent.updateUI()

getUIClassID

public String getUIClassID()

Returns a string that specifies the name of the l&f class that renders this component.

Overrides:: getUIClassID in class JComponent

Returns:: String "LabelUI"
See Also:: JComponent.getUIClassID(), UIDefaults.getUI(javax.swing.JComponent)

getText

public String getText()

Returns the text string that the label displays.

Returns:: a String
See Also:: setText(java.lang.String)

setText

public void setText(String text)

Defines the single line of text this component will display. If the value of text is null or empty string, nothing is displayed.

The default value of this property is null.

This is a JavaBeans bound property.

See Also:: setVerticalTextPosition(int), setHorizontalTextPosition(int), setIcon(javax.swing.Icon)

getIcon

public Icon getIcon()

Returns the graphic image (glyph, icon) that the label displays.

Returns:: an Icon
See Also:: setIcon(javax.swing.Icon)

setIcon

public void setIcon(Icon icon)

Defines the icon this component will display. If the value of icon is null, nothing is displayed.

The default value of this property is null.

This is a JavaBeans bound property.

See Also:: setVerticalTextPosition(int), setHorizontalTextPosition(int), getIcon()

getDisabledIcon

public Icon getDisabledIcon()

Returns the value of the disabledIcon property if it's been set, If it hasn't been set and the value of the icon property is an ImageIcon, we compute a "grayed out" version of the icon and update the disabledIcon property with that.

Returns:: The value of the disabledIcon property.
See Also:: setDisabledIcon(javax.swing.Icon), ImageIcon

setDisabledIcon

public void setDisabledIcon(Icon disabledIcon)

Set the icon to be displayed if this JLabel is "disabled", i.e. JLabel.setEnabled(false).

The default value of this property is null.

Parameters:: disabledIcon - the Icon to display when the component is disabled
See Also:: getDisabledIcon(), JComponent.setEnabled(boolean)

setDisplayedMnemonic

public void setDisplayedMnemonic(int key)

Specify a keycode that indicates a mnemonic key. This property is used when the label is part of a larger component. If the labelFor property of the label is not null, the label will call the requestFocus method of the component specified by the labelFor property when the mnemonic is activated.

See Also:: getLabelFor(), setLabelFor(java.awt.Component)

setDisplayedMnemonic

public void setDisplayedMnemonic(char aChar)

Specifies the displayedMnemonic as a char value.

Parameters:: aChar - a char specifying the mnemonic to display
See Also:: setDisplayedMnemonic(int)

getDisplayedMnemonic

public int getDisplayedMnemonic()

Return the keycode that indicates a mnemonic key. This property is used when the label is part of a larger component. If the labelFor property of the label is not null, the label will call the requestFocus method of the component specified by the labelFor property when the mnemonic is activated.

Returns:: int value for the mnemonic key
See Also:: getLabelFor(), setLabelFor(java.awt.Component)

checkHorizontalKey

protected int checkHorizontalKey(int key,
                                 String message)

Verify that key is a legal value for the horizontalAlignment properties.

Parameters:: key - the property value to check; message - the IllegalArgumentException detail message
Throws:: IllegalArgumentException - if key isn't LEFT, CENTER, RIGHT, LEADING or TRAILING.
See Also:: setHorizontalTextPosition(int), setHorizontalAlignment(int)

checkVerticalKey

protected int checkVerticalKey(int key,
                               String message)

Verify that key is a legal value for the verticalAlignment or verticalTextPosition properties.

Parameters:: key - the property value to check; message - the IllegalArgumentException detail message
Throws:: IllegalArgumentException - if key isn't TOP, CENTER, or BOTTOM.
See Also:: setVerticalAlignment(int), setVerticalTextPosition(int)

getIconTextGap

public int getIconTextGap()

Returns the amount of space between the text and the icon displayed in this label.

Returns:: an int equal to the number of pixels between the text and the icon.
See Also:: setIconTextGap(int)

setIconTextGap

public void setIconTextGap(int iconTextGap)

If both the icon and text properties are set, this property defines the space between them.

The default value of this property is 4 pixels.

This is a JavaBeans bound property.

See Also:: getIconTextGap()

getVerticalAlignment

public int getVerticalAlignment()

Returns the alignment of the label's contents along the Y axis.

Returns:: The value of the verticalAlignment property, one of the following constants defined in SwingConstants: TOP, CENTER, or BOTTOM.
See Also:: SwingConstants, setVerticalAlignment(int)

setVerticalAlignment

public void setVerticalAlignment(int alignment)

Sets the alignment of the label's contents along the Y axis.

The default value of this property is CENTER.

Parameters:: alignment - One of the following constants defined in SwingConstants: TOP, CENTER (the default), or BOTTOM.
See Also:: SwingConstants, getVerticalAlignment()

getHorizontalAlignment

public int getHorizontalAlignment()

Returns the alignment of the label's contents along the X axis.

Returns:: The value of the horizontalAlignment property, one of the following constants defined in SwingConstants: LEFT, CENTER, RIGHT, LEADING or TRAILING.
See Also:: setHorizontalAlignment(int), SwingConstants

setHorizontalAlignment

public void setHorizontalAlignment(int alignment)

Sets the alignment of the label's contents along the X axis.

This is a JavaBeans bound property.

Parameters:: alignment - One of the following constants defined in SwingConstants: LEFT, CENTER (the default for image-only labels), RIGHT, LEADING (the default for text-only labels) or TRAILING.
See Also:: SwingConstants, getHorizontalAlignment()

getVerticalTextPosition

public int getVerticalTextPosition()

Returns the vertical position of the label's text, relative to its image.

Returns:: One of the following constants defined in SwingConstants: TOP, CENTER, or BOTTOM.
See Also:: setVerticalTextPosition(int), SwingConstants

setVerticalTextPosition

public void setVerticalTextPosition(int textPosition)

Sets the vertical position of the label's text, relative to its image.

The default value of this property is CENTER.

This is a JavaBeans bound property.

Parameters:: textPosition - One of the following constants defined in SwingConstants: TOP, CENTER (the default), or BOTTOM.
See Also:: SwingConstants, getVerticalTextPosition()

getHorizontalTextPosition

public int getHorizontalTextPosition()

Returns the horizontal position of the label's text, relative to its image.

Returns:: One of the following constants defined in SwingConstants: LEFT, CENTER, RIGHT, LEADING or TRAILING.
See Also:: SwingConstants

setHorizontalTextPosition

public void setHorizontalTextPosition(int textPosition)

Sets the horizontal position of the label's text, relative to its image.

Parameters:: x - One of the following constants defined in SwingConstants: LEFT, CENTER, RIGHT, LEADING, or TRAILING (the default).
Throws:: IllegalArgumentException -
See Also:: SwingConstants

paramString

protected String paramString()

Returns a string representation of this JLabel. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.

Overrides:: paramString in class JComponent

Returns:: a string representation of this JLabel.

getAccessibleContext

public AccessibleContext getAccessibleContext()

Get the AccessibleContext of this object

Specified by:: getAccessibleContext in interface Accessible
Overrides:: getAccessibleContext in class JComponent

Returns:: the AccessibleContext of this object

getLabelFor

public Component getLabelFor()

Get the component this is labelling.

Returns:: the Component this is labelling. Can be null if this does not label a Component. If the displayedMnemonic property is set and the labelFor property is also set, the label will call the requestFocus method of the component specified by the labelFor property when the mnemonic is activated.
See Also:: getDisplayedMnemonic(), setDisplayedMnemonic(int)

setLabelFor

public void setLabelFor(Component c)

Set the component this is labelling. Can be null if this does not label a Component. If the displayedMnemonic property is set and the labelFor property is also set, the label will call the requestFocus method of the component specified by the labelFor property when the mnemonic is activated.

Parameters:: c - the Component this label is for, or null if the label is not the label for a component
See Also:: getDisplayedMnemonic(), setDisplayedMnemonic(int)

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Inner Class Summary
`protected class`	`JLabel.AccessibleJLabel` The class used to obtain the accessible role for this object.

Constructor Summary
`JLabel()` Creates a `JLabel` instance with no image and with an empty string for the title.
`JLabel(Icon image)` Creates a `JLabel` instance with the specified image.
`JLabel(Icon image, int horizontalAlignment)` Creates a `JLabel` instance with the specified image and horizontal alignment.
`JLabel(String text)` Creates a `JLabel` instance with the specified text.
`JLabel(String text, Icon icon, int horizontalAlignment)` Creates a `JLabel` instance with the specified text, image, and horizontal alignment.
`JLabel(String text, int horizontalAlignment)` Creates a `JLabel` instance with the specified text and horizontal alignment.

Method Summary
`protected int`	`checkHorizontalKey(int key, String message)` Verify that key is a legal value for the horizontalAlignment properties.
`protected int`	`checkVerticalKey(int key, String message)` Verify that key is a legal value for the verticalAlignment or verticalTextPosition properties.
`AccessibleContext`	`getAccessibleContext()` Get the AccessibleContext of this object
`Icon`	`getDisabledIcon()` Returns the value of the disabledIcon property if it's been set, If it hasn't been set and the value of the icon property is an ImageIcon, we compute a "grayed out" version of the icon and update the disabledIcon property with that.
`int`	`getDisplayedMnemonic()` Return the keycode that indicates a mnemonic key.
`int`	`getHorizontalAlignment()` Returns the alignment of the label's contents along the X axis.
`int`	`getHorizontalTextPosition()` Returns the horizontal position of the label's text, relative to its image.
`Icon`	`getIcon()` Returns the graphic image (glyph, icon) that the label displays.
`int`	`getIconTextGap()` Returns the amount of space between the text and the icon displayed in this label.
`Component`	`getLabelFor()` Get the component this is labelling.
`String`	`getText()` Returns the text string that the label displays.
`LabelUI`	`getUI()` Returns the L&F object that renders this component.
`String`	`getUIClassID()` Returns a string that specifies the name of the l&f class that renders this component.
`int`	`getVerticalAlignment()` Returns the alignment of the label's contents along the Y axis.
`int`	`getVerticalTextPosition()` Returns the vertical position of the label's text, relative to its image.
`protected String`	`paramString()` Returns a string representation of this JLabel.
`void`	`setDisabledIcon(Icon disabledIcon)` Set the icon to be displayed if this JLabel is "disabled", i.e.
`void`	`setDisplayedMnemonic(char aChar)` Specifies the displayedMnemonic as a char value.
`void`	`setDisplayedMnemonic(int key)` Specify a keycode that indicates a mnemonic key.
`void`	`setHorizontalAlignment(int alignment)` Sets the alignment of the label's contents along the X axis.
`void`	`setHorizontalTextPosition(int textPosition)` Sets the horizontal position of the label's text, relative to its image.
`void`	`setIcon(Icon icon)` Defines the icon this component will display.
`void`	`setIconTextGap(int iconTextGap)` If both the icon and text properties are set, this property defines the space between them.
`void`	`setLabelFor(Component c)` Set the component this is labelling.
`void`	`setText(String text)` Defines the single line of text this component will display.
`void`	`setUI(LabelUI ui)` Sets the L&F object that renders this component.
`void`	`setVerticalAlignment(int alignment)` Sets the alignment of the label's contents along the Y axis.
`void`	`setVerticalTextPosition(int textPosition)` Sets the vertical position of the label's text, relative to its image.
`void`	`updateUI()` Notification from the UIFactory that the L&F has changed.

Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class JLabel - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

javax.swing Class JLabel

labelFor

JLabel

JLabel

JLabel

JLabel

JLabel

JLabel

getUI

setUI

updateUI

getUIClassID

getText

setText

getIcon

setIcon

getDisabledIcon

setDisabledIcon

setDisplayedMnemonic

setDisplayedMnemonic

getDisplayedMnemonic

checkHorizontalKey

checkVerticalKey

getIconTextGap

setIconTextGap

getVerticalAlignment

setVerticalAlignment

getHorizontalAlignment

setHorizontalAlignment

getVerticalTextPosition

setVerticalTextPosition

getHorizontalTextPosition

setHorizontalTextPosition

paramString

getAccessibleContext

getLabelFor

setLabelFor

javax.swing
Class JLabel