# Class JRadioButton

java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.AbstractButton
javax.swing.JToggleButton
javax.swing.JRadioButton

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

@JavaBean(description="A component which can display it's state as selected or deselected.") 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 `Action`s. 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`.

Since:
  1.2
See Also:
  - `ButtonGroup`
  - `JCheckBox`

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `protected class`
  `JRadioButton.AccessibleJRadioButton`
  This class implements accessibility support for the `JRadioButton` class.

  ### Nested classes/interfaces declared in class JToggleButton

  `JToggleButton.AccessibleJToggleButton, JToggleButton.ToggleButtonModel`

  ### Nested classes/interfaces declared in class AbstractButton

  `AbstractButton.AccessibleAbstractButton, AbstractButton.ButtonChangeListener`

  ### Nested classes/interfaces declared in class JComponent

  `JComponent.AccessibleJComponent`

  ### Nested classes/interfaces declared in class Container

  `Container.AccessibleAWTContainer`

  ### Nested classes/interfaces declared in class Component

  `Component.AccessibleAWTComponent, Component.BaselineResizeBehavior, Component.BltBufferStrategy, Component.FlipBufferStrategy`

- ## Field Summary

  ### Fields declared in class AbstractButton

  `actionListener, BORDER_PAINTED_CHANGED_PROPERTY, changeEvent, changeListener, CONTENT_AREA_FILLED_CHANGED_PROPERTY, DISABLED_ICON_CHANGED_PROPERTY, DISABLED_SELECTED_ICON_CHANGED_PROPERTY, FOCUS_PAINTED_CHANGED_PROPERTY, HORIZONTAL_ALIGNMENT_CHANGED_PROPERTY, HORIZONTAL_TEXT_POSITION_CHANGED_PROPERTY, ICON_CHANGED_PROPERTY, itemListener, MARGIN_CHANGED_PROPERTY, MNEMONIC_CHANGED_PROPERTY, model, MODEL_CHANGED_PROPERTY, PRESSED_ICON_CHANGED_PROPERTY, ROLLOVER_ENABLED_CHANGED_PROPERTY, ROLLOVER_ICON_CHANGED_PROPERTY, ROLLOVER_SELECTED_ICON_CHANGED_PROPERTY, SELECTED_ICON_CHANGED_PROPERTY, TEXT_CHANGED_PROPERTY, VERTICAL_ALIGNMENT_CHANGED_PROPERTY, VERTICAL_TEXT_POSITION_CHANGED_PROPERTY`

  ### Fields declared in class JComponent

  `listenerList, TOOL_TIP_TEXT_KEY, ui, UNDEFINED_CONDITION, WHEN_ANCESTOR_OF_FOCUSED_COMPONENT, WHEN_FOCUSED, WHEN_IN_FOCUSED_WINDOW`

  ### Fields declared in class Component

  `accessibleContext, BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

  ### Fields declared in interface ImageObserver

  `ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

  ### Fields declared in interface SwingConstants

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

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `JRadioButton()`
  Creates an initially unselected radio button with no set text.
  `JRadioButton(String text)`
  Creates an unselected radio button with the specified text.
  `JRadioButton(String text, boolean selected)`
  Creates a radio button with the specified text and selection state.
  `JRadioButton(String text, Icon icon)`
  Creates a radio button that has the specified text and image, and that is initially unselected.
  `JRadioButton(String text, Icon icon, boolean selected)`
  Creates a radio button that has the specified text, image, and selection state.
  `JRadioButton(Action a)`
  Creates a radiobutton where properties are taken from the Action supplied.
  `JRadioButton(Icon icon)`
  Creates an initially unselected radio button with the specified image but no text.
  `JRadioButton(Icon icon, boolean selected)`
  Creates a radio button with the specified image and selection state, but no text.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `AccessibleContext`
  `getAccessibleContext()`
  Gets the AccessibleContext associated with this JRadioButton.
  `String`
  `getUIClassID()`
  Returns the name of the L&F class that renders this component.
  `protected String`
  `paramString()`
  Returns a string representation of this JRadioButton.
  `void`
  `updateUI()`
  Resets the UI property to a value from the current look and feel.

  ### Methods declared in class JToggleButton

  `requestFocus, requestFocusInWindow`

  ### Methods declared in class AbstractButton

  `actionPropertyChanged, addActionListener, addChangeListener, addImpl, addItemListener, checkHorizontalKey, checkVerticalKey, configurePropertiesFromAction, createActionListener, createActionPropertyChangeListener, createChangeListener, createItemListener, doClick, doClick, fireActionPerformed, fireItemStateChanged, fireStateChanged, getAction, getActionCommand, getActionListeners, getChangeListeners, getDisabledIcon, getDisabledSelectedIcon, getDisplayedMnemonicIndex, getHideActionText, getHorizontalAlignment, getHorizontalTextPosition, getIcon, getIconTextGap, getItemListeners, getLabel, getMargin, getMnemonic, getModel, getMultiClickThreshhold, getPressedIcon, getRolloverIcon, getRolloverSelectedIcon, getSelectedIcon, getSelectedObjects, getText, getUI, getVerticalAlignment, getVerticalTextPosition, imageUpdate, init, isBorderPainted, isContentAreaFilled, isFocusPainted, isRolloverEnabled, isSelected, paintBorder, removeActionListener, removeChangeListener, removeItemListener, removeNotify, setAction, setActionCommand, setBorderPainted, setContentAreaFilled, setDisabledIcon, setDisabledSelectedIcon, setDisplayedMnemonicIndex, setEnabled, setFocusPainted, setHideActionText, setHorizontalAlignment, setHorizontalTextPosition, setIcon, setIconTextGap, setLabel, setLayout, setMargin, setMnemonic, setMnemonic, setModel, setMultiClickThreshhold, setPressedIcon, setRolloverEnabled, setRolloverIcon, setRolloverSelectedIcon, setSelected, setSelectedIcon, setText, setUI, setVerticalAlignment, setVerticalTextPosition`

  ### Methods declared in class JComponent

  `addAncestorListener, addNotify, addVetoableChangeListener, computeVisibleRect, contains, createToolTip, disable, enable, firePropertyChange, firePropertyChange, fireVetoableChange, getActionForKeyStroke, getActionMap, getAlignmentX, getAlignmentY, getAncestorListeners, getAutoscrolls, getBaseline, getBaselineResizeBehavior, getBorder, getBounds, getClientProperty, getComponentGraphics, getComponentPopupMenu, getConditionForKeyStroke, getDebugGraphicsOptions, getDefaultLocale, getFontMetrics, getGraphics, getHeight, getInheritsPopupMenu, getInputMap, getInputMap, getInputVerifier, getInsets, getInsets, getListeners, getLocation, getMaximumSize, getMinimumSize, getNextFocusableComponent, getPopupLocation, getPreferredSize, getRegisteredKeyStrokes, getRootPane, getSize, getToolTipLocation, getToolTipText, getToolTipText, getTopLevelAncestor, getTransferHandler, getVerifyInputWhenFocusTarget, getVetoableChangeListeners, getVisibleRect, getWidth, getX, getY, grabFocus, hide, isDoubleBuffered, isLightweightComponent, isManagingFocus, isOpaque, isOptimizedDrawingEnabled, isPaintingForPrint, isPaintingOrigin, isPaintingTile, isRequestFocusEnabled, isValidateRoot, paint, paintChildren, paintComponent, paintImmediately, paintImmediately, print, printAll, printBorder, printChildren, printComponent, processComponentKeyEvent, processKeyBinding, processKeyEvent, processMouseEvent, processMouseMotionEvent, putClientProperty, registerKeyboardAction, registerKeyboardAction, removeAncestorListener, removeVetoableChangeListener, repaint, repaint, requestDefaultFocus, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, resetKeyboardActions, reshape, revalidate, scrollRectToVisible, setActionMap, setAlignmentX, setAlignmentY, setAutoscrolls, setBackground, setBorder, setComponentPopupMenu, setDebugGraphicsOptions, setDefaultLocale, setDoubleBuffered, setFocusTraversalKeys, setFont, setForeground, setInheritsPopupMenu, setInputMap, setInputVerifier, setMaximumSize, setMinimumSize, setNextFocusableComponent, setOpaque, setPreferredSize, setRequestFocusEnabled, setToolTipText, setTransferHandler, setUI, setVerifyInputWhenFocusTarget, setVisible, unregisterKeyboardAction, update`

  ### Methods declared in class Container

  `add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, layout, list, list, locate, minimumSize, paintComponents, preferredSize, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, setComponentZOrder, setFocusCycleRoot, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, transferFocusDownCycle, validate, validateTree`

  ### Methods declared in class Component

  `action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, coalesceEvents, contains, createImage, createImage, createVolatileImage, createVolatileImage, disableEvents, dispatchEvent, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getForeground, getGraphicsConfiguration, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getToolkit, getTreeLock, gotFocus, handleEvent, hasFocus, inside, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, requestFocus, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setFocusable, setFocusTraversalKeysEnabled, setIgnoreRepaint, setLocale, setLocation, setLocation, setMixingCutoutShape, setName, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle`

  ### Methods declared in class Object

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

- ## Constructor Details

  - ### 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.
    Parameters:
      `a` - an `Action`
    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
      `selected` - if `true`, the button is initially selected otherwise, the button is initially unselected

- ## Method Details

  - ### updateUI

    public void updateUI()
    Resets the UI property to a value from the current look and feel.
    Overrides:
      `updateUI` in class `JToggleButton`
    See Also:
      - `JComponent.updateUI()`

  - ### getUIClassID

    @BeanProperty(bound=false, expert=true, description="A string that specifies the name of the L&F class.") public String getUIClassID()
    Returns the name of the L&F class that renders this component.
    Overrides:
      `getUIClassID` in class `JToggleButton`
    Returns:
      the string "RadioButtonUI"
    See Also:
      - `JComponent.getUIClassID()`
      - `UIDefaults.getUI(JComponent)`

  - ### 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

    @BeanProperty(bound=false, expert=true, description="The AccessibleContext associated with this Button") 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