What are sorting algorithms used for?
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Explain the expression trees?
What is a postfix expression?
How many null values are allowed in a set?
What is stack and queue in data structure?
Is hashmap a collection?
Tell me real world example of polymorphism and encapsulation .
Which is the simplest file structure? (a) Sequential (b) Indexed (c) Random (a) Sequential
What do you know about different sorting algorithms?
How do I push an element into a stack?
Why is null not allowed in concurrenthashmap?
How do you insert a new item in a binary search tree?
Define level of the tree?