What is difference between hashmap and map?
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Define 2-3-4 tree?
Why null is allowed in hashmap?
How many types of priority queue are there?
How to inverting a function in sort and searching?
What are the drawbacks of array implementation of queue?
What is the difference between arrays sort and collections sort?
What are linked list?
Why is merge sort faster?
What is the use of tree data structure?
where do you use double linked list?
Define ancestor and descendant ?
Can arraylist have null values?