Q. What is the relation between hashset and hashmap?

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Q. Set has contains(Object o) method.

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Q. What is the difference between TreeSet and SortedSet?

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Q. What happens if two threads simultaneously modify TreeSet?

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Q. What is the unique feature of LinkedHashSet?

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Q. Which of these standard collection classes implements a linked list data structure?

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Q. Which of these classes implements Set interface?

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Q. Which of these method is used to add an element to the start of a LinkedList object?

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Q. Which of these method of HashSet class is used to add elements to its object?

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Q. Which of these methods can be used to delete the last element in a LinkedList object?

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Q. Which of this method is used to change an element in a LinkedList Object?

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Q. Which of these object stores association between keys and values?

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Q. Which of these classes provide implementation of map interface?

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Q. Which of these method is used to remove all keys/values pair from the invoking map?

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Q. Which of these method Map class is used to obtain an element in the map having specified key?

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Q. Which of these methods can be used to obtain set of all keys in a map?

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Q. Which of these method is used add an element and corresponding key to a map?

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Q. Which of these class object can be used to form a dynamic array?

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Q. Which of these are legacy classes?

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Q. Which of these is the interface of legacy?

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