Does hashmap allow null keys?
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What is the difference between collections class vs collections interface?
What sort of serious problems have you experienced, and how have you handled them?
What is minimum depth of binary tree?
What is space complexity of a program?
What is the advantage of circular linked list?
Write a program to sum values of given array.
What are the types of collection?
What are splay trees?
Write an algorithm for inserting and deleting an element from doubly linked list?
What are linked lists good for?
What are the applications of priority queues?
What is raid (redundant array of inexpensive disks)?