This class functions as an adapter to JDK1.4 only objects. Under
JDK1.4 you can use the method AWTAdapterFactory.getFactory() to
get an implementation of the AWTAdaptorFactory. Under JDK<1.4
AWTAdapterFactory.getFactory() returns null.
Creates a MouseWheelObservable for the specified component. When
the MouseWheel is moved all Observers will get notified. The value
passed to the observers is the result of MouseWheelEvent.getWheelRotation().