Why null is allowed in hashmap?
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Does treemap sort on key or value?
Mention one advantage and disadvantage of using quadratic probing?
Is bubble sort adaptive?
Can a null element added to a treeset or hashset?
What is heap tree?
What are the major data structures used in the following areas : network data model & hierarchical data model?
What is perfect binary tree?
How do you increase the capacity of an arraylist?
What do you mean by external sorting?
Is it possible to insert different type of elements in a stack? How?
Does treeset allow null values?
Define degree of the node?