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| Core Java - Interview Questions and Answers for 'Collections classe' - 2 question(s) found - Order By Rating | ||||
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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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 Discuss Correct / Improve  java collections collections classes advantages of collections over arrays collections vs arrays basic interview question  Asked in 6 Companies  basic  frequent | ||||
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 What are the Disadvantages of using Collection Classes over Arrays ? | ||||
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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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