Core Java - Interview Questions and Answers for 'Collection interface' | Search Interview Question

Core Java - Interview Questions and Answers for 'Collection interface' - 6 question(s) found - Order By Rating

Q1. Which is the root interface of Collection classes in Java ?

Core Java

Ans. java.util.Collection

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Q2. Why Collection interface does not extend Cloneable interface ?

Core Java

Ans. Here is the list of classes that implements Collections Interface - http://www.buggybread.com/2015/02/java-collections-classes-that-implement.html

Having Collection interface to extend Cloneable interface would mean necessarily implement clone method by all implementing classes. As not all collection classes allow duplicate elements, it makes no sense to clone elements for them.

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Q3. what is the difference between collections class vs collections interface ?

Core Java

Ans. Collections class is a utility class having static methods for doing operations on objects of classes which implement the Collection interface. For example, Collections has methods for finding the max element in a Collection.

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Q4. Name few interfaces that extends Collection Interface ?

Ans. http://www.buggybread.com/2015/02/java-collections-interfaces-that.html

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Q5. Name few classes that implement Collection interface ?

Ans. http://www.buggybread.com/2015/02/java-collections-classes-that-implement.html

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Q6. Which of the following doesn't extend Collection interface ?

a. Set
b. List
c. Map
d. Queue

Core Java

Ans. Map

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