/**
* Adds the specified item listener to receive item events from this check box. Item events are
* sent to listeners in response to user input, but not in response to calls to setState(). If l
* is null, no exception is thrown and no action is performed.
*
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" >AWT Threading Issues</a>
* for details on AWT's threading model.
*
* @param l the item listener
* @see #removeItemListener
* @see #getItemListeners
* @see #setState
* @see j86.java.awt.event.ItemEvent
* @see j86.java.awt.event.ItemListener
* @since JDK1.1
*/
public synchronized void addItemListener(ItemListener l) {
if (l == null) {
return;
}
itemListener = AWTEventMulticaster.add(itemListener, l);
newEventsOnly = true;
}
/**
* Returns an array of all the objects currently registered as <code><em>Foo</em>Listener</code>s
* upon this <code>Checkbox</code>. <code><em>Foo</em>Listener</code>s are registered using the
* <code>add<em>Foo</em>Listener</code> method.
*
* <p>You can specify the <code>listenerType</code> argument with a class literal, such as <code>
* <em>Foo</em>Listener.class</code>. For example, you can query a <code>Checkbox</code> <code>c
* </code> for its item listeners with the following code:
*
* <pre>ItemListener[] ils = (ItemListener[])(c.getListeners(ItemListener.class));</pre>
*
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter should specify an interface
* that descends from <code>j86.java.util.EventListener</code>
* @return an array of all objects registered as <code><em>Foo</em>Listener</code>s on this
* checkbox, or an empty array if no such listeners have been added
* @exception ClassCastException if <code>listenerType</code> doesn't specify a class or interface
* that implements <code>j86.java.util.EventListener</code>
* @see #getItemListeners
* @since 1.3
*/
public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
EventListener l = null;
if (listenerType == ItemListener.class) {
l = itemListener;
} else {
return super.getListeners(listenerType);
}
return AWTEventMulticaster.getListeners(l, listenerType);
}
/**
* Writes default serializable fields to stream. Writes a list of serializable <code>ItemListeners
* </code> as optional data. The non-serializable <code>ItemListeners</code> are detected and no
* attempt is made to serialize them.
*
* @param s the <code>ObjectOutputStream</code> to write
* @serialData <code>null</code> terminated sequence of 0 or more pairs; the pair consists of a
* <code>String</code> and an <code>Object</code>; the <code>String</code> indicates the type
* of object and is one of the following: <code>itemListenerK</code> indicating an <code>
* ItemListener</code> object
* @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener)
* @see j86.java.awt.Component#itemListenerK
* @see #readObject(ObjectInputStream)
*/
private void writeObject(ObjectOutputStream s) throws j86.java.io.IOException {
s.defaultWriteObject();
AWTEventMulticaster.save(s, itemListenerK, itemListener);
s.writeObject(null);
}
/**
* Removes the specified item listener so that the item listener no longer receives item events
* from this check box. If l is null, no exception is thrown and no action is performed.
*
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" >AWT Threading Issues</a>
* for details on AWT's threading model.
*
* @param l the item listener
* @see #addItemListener
* @see #getItemListeners
* @see j86.java.awt.event.ItemEvent
* @see j86.java.awt.event.ItemListener
* @since JDK1.1
*/
public synchronized void removeItemListener(ItemListener l) {
if (l == null) {
return;
}
itemListener = AWTEventMulticaster.remove(itemListener, l);
}