Can hashset contain null?
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For searches. Which one is most preferred: array list or linked list?
Differentiate between iterator and enumeration.
Which is better hashset or treeset?
Define leaves?
what is Linked lists?
What is the relationship between a queue and its underlying array?
What is a subtree in data structures?
How do you initialize an arraylist?
Is treeset sorted?
Can hashmap be sorted?
What is a hash index?
What is a singletonlist?