List three operations common to all collections. What does it mean if an operation is optional? What is the difference between Collections (plural) and Collection (singular)?
What will be an ideal response?
All collections support some form of addition and removal of elements, as well as a way to test for membership. Other common operations:
1. Add the elements of one collection to another collection.
2. Remove all the elements of one collection from another collection.
3. Retain only the elements of one collection that are present in another collection.
4. Determine if one collection contains all the elements in another collection.
An optional operation means that the implementing class must include these methods, but need not support them.
Collections (plural) is the name of a class (like the Math class), whereas Collection (singular) is the name of the interface implemented by a set of collection classes.
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