Answer Posted / zaheer ahmed

"You can so easily mistake "Collections" for "Collection"—be careful.
Keep in mind that Collections is a class, with static utility methods, while Collection
is an interface with declarations of the methods common to most collections
including add(), remove(), contains(), size(), and iterator()"

Reference:
Mc Graw Hill - SCJP Sun Certified Programmer for Java 6 Exam 310-065 (2008)Page 559

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