Have you ever used HashTable and Directory?
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Tell me real world example of polymorphism and encapsulation .
What is the difference between linked list and array?
Is map a collection?
Are linked lists considered linear or non-linear data structure?
Can we define the size of arraylist?
Why is concurrenthashmap thread safe?
What is the difference between hashset and treeset?
Define a binary search tree?
Define degree of the node?
Is int a data structure?
What is the best time complexity of bubble sort?
For which header list, the last node contains the null pointer?