SharedClassObject.java 文件源码

/**
 * Removes the specified property change listener so that it
 * no longer receives property change events from this object.
 * @param         l     the property change listener
 */
public final void removePropertyChangeListener(PropertyChangeListener l) {
    boolean callRemoved;

    synchronized (getLock()) {
        PropertyChangeSupport supp = (PropertyChangeSupport) getProperty(PROP_SUPPORT);

        if (supp == null) {
            return;
        }

        boolean hasListener = supp.hasListeners(null);
        supp.removePropertyChangeListener(l);
        callRemoved = hasListener && !supp.hasListeners(null);
    }

    if (callRemoved) {
        putProperty(PROP_SUPPORT, null); // clean the PCS, see #25417
        removeNotifySuper = false;
        removeNotify();

        if (!removeNotifySuper) {
            String msg = "You must call super.removeNotify() from " + getClass().getName() + ".removeNotify()"; // NOI18N
            err.warning(msg);
        }
    }
}