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

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Class java.awt.CheckboxGroup

java.lang.Object
   |
   +----java.awt.CheckboxGroup

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:

See Also:: Checkbox

CheckboxGroup(): Creates a new instance of CheckboxGroup.

getCurrent(): Deprecated.
getSelectedCheckbox(): Gets the current choice from this check box group.
setCurrent(Checkbox): Deprecated.
setSelectedCheckbox(Checkbox): Sets the currently selected check box in this group to be the specified check box.
toString(): Returns a string representation of this check box group, including the value of its current selection.

CheckboxGroup

 public CheckboxGroup()

Creates a new instance of CheckboxGroup.

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.
See Also:: Checkbox, setSelectedCheckbox

getCurrent

 public Checkbox getCurrent()

Note: getCurrent() is deprecated. As of JDK version 1.1, replaced by getSelectedCheckbox().

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 or belongs to a different check box group, then this method does nothing.

Parameters:: box - the Checkbox to set as the current selection.
See Also:: Checkbox, getSelectedCheckbox

setCurrent

 public synchronized void setCurrent(Checkbox box)

Note: setCurrent() is deprecated. As of JDK version 1.1, replaced by setSelectedCheckbox(Checkbox).

toString

 public String toString()

Returns a string representation of this check box group, including the value of its current selection.

Returns:: a string representation of this check box group.
Overrides:: toString in class Object

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