Class CheckboxGroup

java.lang.Object
java.awt.CheckboxGroup
All Implemented Interfaces:
Serializable
public class CheckboxGroup extends Object implements Serializable
The CheckboxGroup class is used to group together a set of Checkbox buttons.

Exactly one check box button in a CheckboxGroup can be in the "on" state at any given time. Pushing any button sets its state to "on" and forces any other button that is in the "on" state into the "off" state.

The following code example produces a new check box group, with three check boxes: 

setLayout(new GridLayout(3, 1));
CheckboxGroup cbg = new CheckboxGroup();
add(new Checkbox("one", cbg, true));
add(new Checkbox("two", cbg, false));
add(new Checkbox("three", cbg, false));

This image depicts the check box group created by this example:

Shows three checkboxes, arranged vertically, labeled one, two, and three. Checkbox one is in the on state.

Since:
1.0
See Also:

  • Constructor Summary

    Constructors
    Constructor
    Description
    CheckboxGroup()
    Creates a new instance of CheckboxGroup.

  • Method Summary

    Modifier and Type
    Method
    Description
    Checkbox
    getCurrent()
    Deprecated.
    As of JDK version 1.1, replaced by getSelectedCheckbox().
    Checkbox
    getSelectedCheckbox()
    Gets the current choice from this check box group.
    void
    setCurrent(Checkbox box)
    Deprecated.
    As of JDK version 1.1, replaced by setSelectedCheckbox(Checkbox).
    void
    setSelectedCheckbox(Checkbox box)
    Sets the currently selected check box in this group to be the specified check box.
    String
    toString()
    Returns a string representation of this check box group, including the value of its current selection.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Creates and returns a copy of this object.
    boolean
    equals(Object obj)
    Indicates whether some other object is "equal to" this one.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    Finalization is deprecated and subject to removal in a future release.
    final Class<?>
    getClass()
    Returns the runtime class of this Object.
    int
    hashCode()
    Returns a hash code value for this object.
    final void
    notify()
    Wakes up a single thread that is waiting on this object's monitor.
    final void
    notifyAll()
    Wakes up all threads that are waiting on this object's monitor.
    final void
    wait()
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
    final void
    wait(long timeoutMillis)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
    final void
    wait(long timeoutMillis, int nanos)
    Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

  • Constructor Details

    • CheckboxGroup

      public CheckboxGroup()
      Creates a new instance of CheckboxGroup.

  • Method Details

    • getSelectedCheckbox

      public Checkbox getSelectedCheckbox()
      Gets the current choice from this check box group. The current choice is the check box in this group that is currently in the "on" state, or null if all check boxes in the group are off.
      Returns:
      the check box that is currently in the "on" state, or null.
      Since:
      1.1
      See Also:

    • getCurrent

      @Deprecated public Checkbox getCurrent()
      Deprecated.
      As of JDK version 1.1, replaced by getSelectedCheckbox().
      Returns the current choice from this check box group or null if none of checkboxes are selected.
      Returns:
      the selected checkbox

    • setSelectedCheckbox

      public void setSelectedCheckbox(Checkbox box)
      Sets the currently selected check box in this group to be the specified check box. This method sets the state of that check box to "on" and sets all other check boxes in the group to be off.

      If the check box argument is null, all check boxes in this check box group are deselected. If the check box argument belongs to a different check box group, this method does nothing.

      Parameters:
      box - the Checkbox to set as the current selection.
      Since:
      1.1
      See Also:

    • setCurrent

      @Deprecated public void setCurrent(Checkbox box)
      Deprecated.
      As of JDK version 1.1, replaced by setSelectedCheckbox(Checkbox).
      Sets the currently selected check box in this group to be the specified check box and unsets all others.
      Parameters:
      box - the Checkbox to set as the current selection.

    • toString

      public String toString()
      Returns a string representation of this check box group, including the value of its current selection.
      Overrides:
      toString in class Object
      Returns:
      a string representation of this check box group.