What is difference between list and set?
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Differentiate between iterator and listiterator.
What's the difference between a hashtable and a hashmap?
Is hashtable fail fast?
Why do we use sorting?
Should I use hashmap or hashtable?
What is best time complexity?
What is hash data type?
What is comparator interface used for?
What data type is enum?
write a code for Implementation of stack and queues.
Define shortest path?
What sorting algorithm should be used for sorting strings?