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Core Java - Interview Questions and Answers for 'Collections class' - 4 question(s) found - Order By Newest

 Q1. What are the Disadvantages of using Collection Classes over Arrays ?Core Java
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Ans. Collections can only hold objects, It can't hold primitive data types.

Collections have performance overheads as they deal with objects and offer dynamic memory expansion. This dynamic expansion could be a bigger overhead if the collection class needs consecutive memory location like Vectors.

Collections doesn't allow modification while traversal as it may lead to concurrentModificationException.

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  Q2. what is the difference between collections class vs collections interface ?Core Java
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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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  Q3. Advantage of Collection classes over Arrays ?Core Java
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Ans. Collections are re-sizable in nature. We can increase or decrease the size as per recruitment.
Collections can hold both homogeneous and heterogeneous data's.
Every collection follows some standard data structures.
Collection provides many useful built in methods for traversing,sorting and search.

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 Q4. Name few classes that extends Collections class ?
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Ans. http://www.buggybread.com/2015/02/java-collections-classes-that-inherit.html

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