Q: What is a Set?

A: A set is a collection of Objects in which duplicates are not allowed, it models the mathematical set.

Q: What are the main Implementations of the Set interface?

A: HashSet, TreeSet, LinkedHashSet and EnumSet?

Q: What is an EnumSet?

A: An EnumSet is a specialized set for use with enum types, all of the elements in the EnumSet type that is specified, explicitly or implicitly, when the set is created.

Q: What is a HashSet?

A: A HashSet is an Implementation of the SetInterface which internally uses a Hash Table like datastructure(actually elements are stored as keys in a HashMap) structure. It does not guarantee that the insersion order will be maintained and order may not remain constant with time.

Q: What is a TreeSet?

A: TreeSet is a Set implementation that keeps the elements in sorted order. The elements are sorted according to the natural order of elements or by the comparator provided at creation time.

Q: Are HashSet and TreeSet thread safe?

A: Both are not thread safe.

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Pannaga   |203.200.31.xxx |2009-06-25 04:21:48

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