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Class java.awt.Label - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

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Class java.awt.Label

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Label

public class Label
extends Component
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 label:


Variable Index

 o CENTER
Indicates that the label should be centered.
 o LEFT
Indicates that the label should be left justified.
 o RIGHT
Indicates that the label should be right justified.

Constructor Index

 o Label()
Constructs an empty label.
 o Label(String)
Constructs a new label with the specified string of text, left justified.
 o Label(String, int)
Constructs a new label that presents the specified string of text with the specified alignment.

Method Index

 o addNotify()
Creates the peer for this label.
 o getAlignment()
Gets the current alignment of this label.
 o getText()
Gets the text of this label.
 o paramString()
Returns the parameter string representing the state of this label.
 o setAlignment(int)
Sets the alignment for this label to the specified alignment.
 o setText(String)
Sets the text for this label to the specified text.

Variables

 o LEFT
 public static final int LEFT
Indicates that the label should be left justified.

 o CENTER
 public static final int CENTER
Indicates that the label should be centered.

 o RIGHT
 public static final int RIGHT
Indicates that the label should be right justified.

Constructors

 o Label
 public Label()
Constructs an empty label.

 o Label
 public Label(String text)
Constructs a new label with the specified string of text, left justified.

Parameters:
text - the string that the label presents.
 o Label
 public Label(String text,
              int alignment)
Constructs a new label that presents the specified string of text with the specified alignment.

Possible values for alignment are Label.LEFT, Label.RIGHT, and Label.CENTER.

Parameters:
text - the string that the label presents.
alignment - the alignment value.

Methods

 o 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.

Overrides:
addNotify in class Component
 o getAlignment
 public int getAlignment()
Gets the current alignment of this label. Possible values are Label.LEFT, Label.RIGHT, and Label.CENTER.

See Also:
setAlignment
 o setAlignment
 public synchronized void setAlignment(int alignment)
Sets the alignment for this label to the specified alignment. Possible values are Label.LEFT, Label.RIGHT, and Label.CENTER.

Parameters:
alignment - the alignment to be set.
Throws: IllegalArgumentException
if an improper value for alignment is given.
See Also:
getAlignment
 o getText
 public String getText()
Gets the text of this label.

Returns:
the text of this label.
See Also:
setText
 o setText
 public synchronized void setText(String text)
Sets the text for this label to the specified text.

Parameters:
text - the text that this label presents.
See Also:
getText
 o paramString
 protected String paramString()
Returns the parameter string representing the state of this label. This string is useful for debugging.

Returns:
the parameter string of this label.
Overrides:
paramString in class Component

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