Why null is allowed in hashmap?


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More Data Structures Interview Questions

How efficient is binary search?

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Explain about set and their types in a collection?

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Do you know what is linear search?

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How do we find duplicate elements in an array?

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Define a binary search tree?

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How do I sort hashset?

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What are the different types of linked list?

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What is a hash index?

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What is a 2 dimensional array?

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What are priority queues?

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What is the difference between hashmap and arraylist?

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What is the Role of push() and pop() method?

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