public static <U, W> AtomicReferenceFieldUpdater<U, W> newUpdater (Class<U> tclass, Class<W> vclass, String fieldName)

Creates and returns an updater for objects with the given field. The Class arguments are needed to check that reflective types and generic types match.

tclass    the class of the objects holding the field
vclass    the class of the field
fieldName    the name of the field to be updated
<U>    the type of instances of tclass
<W>    the type of instances of vclass

Returns:  the updater

ClassCastException    if the field is of the wrong type
IllegalArgumentException    if the field is not volatile
RuntimeException    with a nested reflection-based exception if the class does not hold field or is the wrong type, or the field is inaccessible to the caller according to Java language access control