What is difference between map and hashmap?
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What are the difference between a stack and a queue?
What is a hashset?
Tell me do array subscripts always start with zero?
What you mean by sorting?
Is arraylist a collection?
What are hashmaps good for?
Tell me what is quick sort?
What are skew trees? For a tree with 4 nodes draw all possible binary? Generalize for n nodes how many binary trees can be drawn?
How are elements stored in hashset?
What is difference between capacity and size of arraylist?
how to insert a new node in linked list where free node will be available?
How to find the duplicate in an array?