IT. Expert System.

Java Standard Edition (SE)

JRadioButton


javax.swing

Class JRadioButton

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


    public class JRadioButton
    extends JToggleButton
    implements Accessible
    An implementation of a radio button -- an item that can be selected or deselected, and which displays its state to the user. Used with a ButtonGroup object to create a group of buttons in which only one button at a time can be selected. (Create a ButtonGroup object and use its add method to include the JRadioButton objects in the group.)
    Note: The ButtonGroup object is a logical grouping -- not a physical grouping. To create a button panel, you should still create a JPanel or similar container-object and add a Border to it to set it off from surrounding components.

    Buttons can be configured, and to some degree controlled, by Actions. Using an Action with a button has many benefits beyond directly configuring a button. Refer to Swing Components Supporting Action for more details, and you can find more information in How to Use Actions, a section in The Java Tutorial.

    See How to Use Buttons, Check Boxes, and Radio Buttons in The Java Tutorial for further documentation.

    Warning: Swing is not thread safe. For more information see Swing's Threading Policy.

    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. As of 1.4, support for long term storage of all JavaBeans™ has been added to the java.beans package. Please see XMLEncoder.

    See Also:
    ButtonGroup, JCheckBox
    • Constructor Detail

      • JRadioButton

        public JRadioButton()
        Creates an initially unselected radio button with no set text.
      • JRadioButton

        public JRadioButton(Icon icon)
        Creates an initially unselected radio button with the specified image but no text.
        Parameters:
        icon - the image that the button should display
      • JRadioButton

        public JRadioButton(Action a)
        Creates a radiobutton where properties are taken from the Action supplied.
        Since:
        1.3
      • JRadioButton

        public JRadioButton(Icon icon,
                            boolean selected)
        Creates a radio button with the specified image and selection state, but no text.
        Parameters:
        icon - the image that the button should display
        selected - if true, the button is initially selected; otherwise, the button is initially unselected
      • JRadioButton

        public JRadioButton(String text)
        Creates an unselected radio button with the specified text.
        Parameters:
        text - the string displayed on the radio button
      • JRadioButton

        public JRadioButton(String text,
                            boolean selected)
        Creates a radio button with the specified text and selection state.
        Parameters:
        text - the string displayed on the radio button
        selected - if true, the button is initially selected; otherwise, the button is initially unselected
      • JRadioButton

        public JRadioButton(String text,
                            Icon icon)
        Creates a radio button that has the specified text and image, and that is initially unselected.
        Parameters:
        text - the string displayed on the radio button
        icon - the image that the button should display
      • JRadioButton

        public JRadioButton(String text,
                            Icon icon,
                            boolean selected)
        Creates a radio button that has the specified text, image, and selection state.
        Parameters:
        text - the string displayed on the radio button
        icon - the image that the button should display
    • Method Detail

      • paramString

        protected String paramString()
        Returns a string representation of this JRadioButton. 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 JToggleButton
        Returns:
        a string representation of this JRadioButton.
      • getAccessibleContext

        public AccessibleContext getAccessibleContext()
        Gets the AccessibleContext associated with this JRadioButton. For JRadioButtons, the AccessibleContext takes the form of an AccessibleJRadioButton. A new AccessibleJRadioButton instance is created if necessary.
        Specified by:
        getAccessibleContext in interface Accessible
        Overrides:
        getAccessibleContext in class JToggleButton
        Returns:
        an AccessibleJRadioButton that serves as the AccessibleContext of this JRadioButton


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