What is the top of a stack?
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How many types of data structures are used?
What is difference between hashset and treeset?
Can you please explain the difference between string and an array?
Why do we use hashmap?
What is time complexity of hashmap?
What is ordered map?
Differentiate between list and set.
Does treemap allow null key?
What are the advantage of collection classes over arrays?
What sort does arrays sort use?
Is json a data structure?
What is an object array?