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Java - Collections - Interview Questions and Answers on ConcurrentHashMap

Q1.  What is a ConcurrentHashMap ?

Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap.

Q2.  Name few Concurrent Collection Classes ?

Ans. ConcurrentHashMap
ConcurrentLinkedDeque
ConcurrentLinkedQueue
ConcurrentMap
ConcurrentNavigableMap
ConcurrentSkipListMap
ConcurrentSkipListSet

Q3. Which is the Parent Class of ConcurrentHashMap class?

Ans.AbstractMap

Q4. Which interfaces are implemented by ConcurrentHashMap?

Ans.[Serializable,  Cloneable,  Map]

Q5. What is the package name for ConcurrentHashMap class?

Ans.java.util


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