CheckboxGroup (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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java.awt
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:

Since:: JDK1.0
See Also:: Checkbox, Serialized Form

Constructor Summary

CheckboxGroup()
          Creates a new instance of CheckboxGroup.

Method Summary

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 inherited from class java.lang.Object

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

Constructor Detail

CheckboxGroup

public CheckboxGroup()

Creates a new instance of CheckboxGroup.

Method Detail

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:: JDK1.1
See Also:: Checkbox, setSelectedCheckbox(java.awt.Checkbox)

getCurrent

public Checkbox getCurrent()

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, 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:: JDK1.1
See Also:: Checkbox, getSelectedCheckbox()

setCurrent

public void setCurrent(Checkbox box)

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.

Overrides:: toString in class Object

Returns:: a string representation of this check box group.