State the difference between arrays and linked lists?
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Write an algorithm for inserting and deleting an element from doubly linked list?
Why do we use hashmap?
Which sorting does collections sort use?
What is ascending and descending order?
Which is faster hashmap or hashset?
Describe stack operation.
Define non-linear data structures?
What is non linear structure?
How will you reverse Linked List.
What is a treemap used for?
Which is faster array or arraylist?
What is bubble sort and quick sort?