What is difference between hashmap and arraylist?
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Explain how to find 3rd element from end in a linked list in one pass?
How do you find the complexity of a bubble sort?
What is the difference between Array and LinkedList?
How do arrays work?
Differentiate between hashset and treeset.
What is meant by balanced binary tree?
When will you sort an array of pointers to list elements, rather than sorting the elements themselves?
Explain what is the data structures used to perform recursion?
Which is better bubble sort or selection sort?
What is a concurrenthashmap?
“int a[] = new int[3]{1, 2, 3}” – This a legal way of defining the arrays?
Is red black tree balanced?