Initial implementation of java.lang.ref

[Jochen Hoenicke]

Hello,

I have just committed the jdk 1.2 Reference classes java.lang.ref.
They don't have any special functionality.  This should be AFAIK
implemented by the garbage collection.  

This should enable us to implement WeakHashtable (even if it doesn't
work yet, it will at least compile) and to use References for caches
(the java.util.ResourceBundle come into my mind).

  Jochen