IT. Expert System.

Java Standard Edition (SE)

Label


java.awt

Class Label

  • All Implemented Interfaces:
    ImageObserver, MenuContainer, Serializable, Accessible


    public class Label
    extends Component
    implements 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:

    two labels: 'hi there!' and 'another label'

    Since:
    JDK1.0
    See Also:
    Serialized Form
    • Field Detail

      • LEFT

        public static final int LEFT
        Indicates that the label should be left justified.
        See Also:
        Constant Field Values
      • CENTER

        public static final int CENTER
        Indicates that the label should be centered.
        See Also:
        Constant Field Values
      • RIGHT

        public static final int RIGHT
        Indicates that the label should be right justified.
        Since:
        JDK1.0t.
        See Also:
        Constant Field Values
    • Constructor Detail

      • Label

        public Label(String text)
              throws HeadlessException
        Constructs a new label with the specified string of text, left justified.
        Parameters:
        text - the string that the label presents. A null value will be accepted without causing a NullPointerException to be thrown.
        Throws:
        HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
        See Also:
        GraphicsEnvironment.isHeadless()
      • Label

        public Label(String text,
                     int alignment)
              throws HeadlessException
        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. A null value will be accepted without causing a NullPointerException to be thrown.
        alignment - the alignment value.
        Throws:
        HeadlessException - if GraphicsEnvironment.isHeadless() returns true.
        See Also:
        GraphicsEnvironment.isHeadless()
    • Method Detail

      • getAlignment

        public int getAlignment()
        Gets the current alignment of this label. Possible values are Label.LEFT, Label.RIGHT, and Label.CENTER.
        See Also:
        setAlignment(int)
      • setAlignment

        public 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()
      • getText

        public String getText()
        Gets the text of this label.
        Returns:
        the text of this label, or null if the text has been set to null.
        See Also:
        setText(java.lang.String)
      • setText

        public void setText(String text)
        Sets the text for this label to the specified text.
        Parameters:
        text - the text that this label displays. If text is null, it is treated for display purposes like an empty string "".
        See Also:
        getText()
      • paramString

        protected String paramString()
        Returns a string representing the state of this Label. 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 Component
        Returns:
        the parameter string of this label
      • getAccessibleContext

        public AccessibleContext 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 interface Accessible
        Overrides:
        getAccessibleContext in class Component
        Returns:
        an AccessibleAWTLabel that serves as the AccessibleContext of this Label
        Since:
        1.3


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