Differentiate null and void?
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What is data structure what is need of it?
What the principle of quick sort and its complexity?
Advanced problems related to Data Structures were asked
Define indegree of a graph?
Why do we use insertion sort?
Why is hashmap faster than arraylist?
Why is arraylist not thread safe?
Do sets allow duplicates?
What are the difference between a stack and a queue?
Can value be null in treemap?
Which is better hashset or treeset?
Are linked lists useful?