Core java - Interview Questions and Answers for 'Eintern' | Search Interview Question

Core java - Interview Questions and Answers for 'Eintern' - 2 question(s) found - Order By Newest

Q1. Difference between Vector and ArrayList ?

Ans. Vectors are synchronized whereas Array lists are not.

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What is the difference between ArrayList and LinkedList ?

If you are given a choice to use either ArrayList and LinkedList, Which one would you use and Why ?

Difference between HashMap and Hashtable?

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Can you provide some implementation of a Dictionary having large number of words ?

Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?

What is a ConcurrentHashMap ?

Collections.sort can only be performed on ..

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Why HashTable has been deprecated ?

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Q2. What is the difference between comparable and comparator in java.util pkg?

Core Java

Ans. Comparable interface is used for single sequence sorting i.e.sorting the objects based on single data member where as comparator interface is used to sort the object based on multiple data members.

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What is comparator interface used for ?

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