Why null is allowed in hashmap?


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More Data Structures Interview Questions

Does treemap sort on key or value?

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Mention one advantage and disadvantage of using quadratic probing?

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Is bubble sort adaptive?

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Can a null element added to a treeset or hashset?

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What is heap tree?

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What are the major data structures used in the following areas : network data model & hierarchical data model?

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What is perfect binary tree?

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How do you increase the capacity of an arraylist?

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What do you mean by external sorting?

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Is it possible to insert different type of elements in a stack? How?

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Does treeset allow null values?

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Define degree of the node?

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