java.lang.Object
java.awt.Component
java.awt.Label
- All Implemented Interfaces:
ImageObserver
,MenuContainer
,Serializable
,Accessible
A
Label
object is a component for placing text in a
container. A label displays a single line of read-only text.
The text can be changed by the application, but a user cannot edit it
directly.
For example, the code . . .
setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10)); add(new Label("Hi There!")); add(new Label("Another Label"));
produces the following labels:
- Since:
- 1.0
- See Also:
-
Nested Class Summary
Modifier and TypeClassDescriptionprotected class
This class implements accessibility support for theLabel
class.Nested classes/interfaces declared in class java.awt.Component
Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy
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Field Summary
Modifier and TypeFieldDescriptionstatic final int
Indicates that the label should be centered.static final int
Indicates that the label should be left justified.static final int
Indicates that the label should be right justified.Fields declared in class java.awt.Component
accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT
Fields declared in interface java.awt.image.ImageObserver
ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
Creates the peer for this label.Gets the AccessibleContext associated with this Label.int
Gets the current alignment of this label.getText()
Gets the text of this label.protected String
Returns a string representing the state of thisLabel
.void
setAlignment
(int alignment) Sets the alignment for this label to the specified alignment.void
Sets the text for this label to the specified text.Methods declared in class java.awt.Component
action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paint, paintAll, postEvent, preferredSize, prepareImage, prepareImage, print, printAll, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setMixingCutoutShape, setName, setPreferredSize, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, update, validate
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Field Details
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LEFT
public static final int LEFTIndicates that the label should be left justified.- See Also:
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CENTER
public static final int CENTERIndicates that the label should be centered.- See Also:
-
RIGHT
public static final int RIGHTIndicates that the label should be right justified.- See Also:
-
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Constructor Details
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Label
Constructs an empty label. The text of the label is the empty string""
.- Throws:
HeadlessException
- if GraphicsEnvironment.isHeadless() returns true.- See Also:
-
Label
Constructs a new label with the specified string of text, left justified.- Parameters:
text
- the string that the label presents. Anull
value will be accepted without causing a NullPointerException to be thrown.- Throws:
HeadlessException
- if GraphicsEnvironment.isHeadless() returns true.- See Also:
-
Label
Constructs a new label that presents the specified string of text with the specified alignment. Possible values foralignment
areLabel.LEFT
,Label.RIGHT
, andLabel.CENTER
.- Parameters:
text
- the string that the label presents. Anull
value will be accepted without causing a NullPointerException to be thrown.alignment
- the alignment value.- Throws:
HeadlessException
- if GraphicsEnvironment.isHeadless() returns true.- See Also:
-
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Method Details
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addNotify
public void addNotify()Creates the peer for this label. The peer allows us to modify the appearance of the label without changing its functionality. -
getAlignment
public int getAlignment()Gets the current alignment of this label. Possible values areLabel.LEFT
,Label.RIGHT
, andLabel.CENTER
.- Returns:
- the alignment of this label
- See Also:
-
setAlignment
public void setAlignment(int alignment) Sets the alignment for this label to the specified alignment. Possible values areLabel.LEFT
,Label.RIGHT
, andLabel.CENTER
.- Parameters:
alignment
- the alignment to be set.- Throws:
IllegalArgumentException
- if an improper value foralignment
is given.- See Also:
-
getText
Gets the text of this label.- Returns:
- the text of this label, or
null
if the text has been set tonull
. - See Also:
-
setText
Sets the text for this label to the specified text.- Parameters:
text
- the text that this label displays. Iftext
isnull
, it is treated for display purposes like an empty string""
.- See Also:
-
paramString
Returns a string representing the state of thisLabel
. 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 benull
.- Overrides:
paramString
in classComponent
- Returns:
- the parameter string of this label
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getAccessibleContext
Gets the AccessibleContext associated with this Label. For labels, the AccessibleContext takes the form of an AccessibleAWTLabel. A new AccessibleAWTLabel instance is created if necessary.- Specified by:
getAccessibleContext
in interfaceAccessible
- Overrides:
getAccessibleContext
in classComponent
- Returns:
- an AccessibleAWTLabel that serves as the AccessibleContext of this Label
- Since:
- 1.3
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