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Package java.util

Added Classes
Timer A facility for threads to schedule tasks for future execution in a background thread.
TimerTask A task that can be scheduled for one-time or repeated execution by a Timer.

Changed Classes
AbstractSet This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
Collections This class consists exclusively of static methods that operate on or return collections.
WeakHashMap A hashtable-based Map implementation with weak keys.