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 * Copyright (c) 1995, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.awt;

/**
 * The <code>CheckboxGroup</code> class is used to group together
 * a set of <code>Checkbox</code> buttons.
 * <p>
 * Exactly one check box button in a <code>CheckboxGroup</code> 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.
 * <p>
 * The following code example produces a new check box group,
 * with three check boxes:
 *
 * <hr><blockquote><pre>
 * 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));
 * </pre></blockquote><hr>
 * <p>
 * This image depicts the check box group created by this example:
 * <p>
 * <img src="doc-files/CheckboxGroup-1.gif"
 * alt="Shows three checkboxes, arranged vertically, labeled one, two, and three. Checkbox one is in the on state."
 * style="float:center; margin: 7px 10px;">
 * <p>
 * @author Sami Shaio
 * @see java.awt.Checkbox
 * @since JDK1.0
 */
public class CheckboxGroup implements java.io.Serializable {
 /**
 * The current choice.
 * @serial
 * @see #getCurrent()
 * @see #setCurrent(Checkbox)
 */
 Checkbox selectedCheckbox = null;

 /*
 * JDK 1.1 serialVersionUID
 */
 private static final long serialVersionUID = 3729780091441768983L;

 /**
 * Creates a new instance of <code>CheckboxGroup</code>.
 */
 public CheckboxGroup() {
 }

 /**
 * 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 <code>null</code> if all check boxes in the
 * group are off.
 * @return the check box that is currently in the
 * "on" state, or <code>null</code>.
 * @see java.awt.Checkbox
 * @see java.awt.CheckboxGroup#setSelectedCheckbox
 * @since JDK1.1
 */
 public Checkbox getSelectedCheckbox() {
 return getCurrent();
 }

 /**
 * @deprecated As of JDK version 1.1,
 * replaced by <code>getSelectedCheckbox()</code>.
 */
 @Deprecated
 public Checkbox getCurrent() {
 return selectedCheckbox;
 }

 /**
 * 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.
 * <p>
 * If the check box argument is <tt>null</tt>, 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.
 * @param box the <code>Checkbox</code> to set as the
 * current selection.
 * @see java.awt.Checkbox
 * @see java.awt.CheckboxGroup#getSelectedCheckbox
 * @since JDK1.1
 */
 public void setSelectedCheckbox(Checkbox box) {
 setCurrent(box);
 }

 /**
 * @deprecated As of JDK version 1.1,
 * replaced by <code>setSelectedCheckbox(Checkbox)</code>.
 */
 @Deprecated
 public synchronized void setCurrent(Checkbox box) {
 if (box != null && box.group != this) {
 return;
 }
 Checkbox oldChoice = this.selectedCheckbox;
 this.selectedCheckbox = box;
 if (oldChoice != null && oldChoice != box && oldChoice.group == this) {
 oldChoice.setState(false);
 }
 if (box != null && oldChoice != box && !box.getState()) {
 box.setStateInternal(true);
 }
 }

 /**
 * Returns a string representation of this check box group,
 * including the value of its current selection.
 * @return a string representation of this check box group.
 */
 public String toString() {
 return getClass().getName() + "[selectedCheckbox=" + selectedCheckbox + "]";
 }

}