Can treemap have null values?
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Differentiate between queue and stack.
How remove all from arraylist?
Two linked lists are given, find out the sum of them without altering the linked list?
Why is arraylist not thread safe?
What is time complexity of binary search?
What is a stable sort?
Write an algorithm to show the postfix expression with the input given as : a b + c d +*f ? .
What is the space complexity of bubble sort?
Describe the merge sort principle and what will be its time complexity?
What are the advantage of collection classes over arrays?
Describe the types of data structures?
Have you ever used HashTable and Directory?