Differentiate between queue and stack.
What is sorting problem?
What is mean by abstract data type?
Can hashmap be sorted?
What is the use of isEmpty() member methods?
Can arraylist have null values?
What is the default size of arraylist?
Explain the Queue
Can we give size to arraylist?
What is the maximum total number of nodes in a tree that has N levels? Note that the root is level (zero)
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Why null is allowed in hashmap?
Explain pre-order and in-order tree traversal.
How to find 3rd element from end in a linked list in one pass?