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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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 Discuss Correct / Improve  java collections collections classes disadvantages of collections over arrays collections vs arrays | ||||
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