public abstract void sync();// throws BackingStoreException;
/*
* Returns the system preference node for the package of the given class.
* The absolute path of the returned node is one slash followed by the given
* class's full package name, replacing each period character ('.') with
* a slash. For example, the absolute path of the preference associated with
* the class Object would be "/java/lang". As a special case, the unnamed
* package is associated with a preference node "/<unnamed>". This
* method will create the node and its ancestors as needed. Any nodes created
* by this method won't necessarily be persisted until the method {@code
* flush()} is invoked.
*
* @param c
* the given class.
* @return the system preference node for the package of the given class.
* @throws NullPointerException
* if the given class is {@code null}.
* @throws SecurityException
* if the {@code RuntimePermission("preferences")} is denied by
* a SecurityManager.
*/
public static Preferences systemNodeForPackage(java.lang.Class c)
{
checkSecurity();
return(factory.systemRoot().node(getNodeName(c)));
}