How do you separate zeros from non-zeros in an array?
What is a 2 dimensional array?
Why do we use hashmap?
Explain implementation of traversal of a binary tree.
What is a weighted graph?
What are the difference between a stack and a queue?
Define red-black trees.
What is a multiset table?
Why linked list is required?
Which is faster hashmap or concurrenthashmap?
Explain the Linked List
Does treeset allow null values?
What is difference between hashmap and hashset?