Q. If two threads access the same hashmap at the same time, what would happen?

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Q. How to externally synchronize hashmap?

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Q. If large number of items are stored in hash bucket, what happens to the internal structure?

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Q. How can we remove an object from ArrayList?

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Q. How to remove duplicates from List?

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Q. How to sort elements of ArrayList?

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Q. When two threads access the same ArrayList object what is the outcome of the program?

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Q. How is Arrays.asList() different than the standard way of initialising List?

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Q. What is the difference between length() and size() of ArrayList?

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Q. Which class provides thread safe implementation of List?

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Q. Which of the below is not an implementation of List interface?

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Q. What is the worst case complexity of accessing an element in ArrayList?

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Q. When an array is passed to a method, will the content of the array undergo changes with the actions carried within the function?

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Q. What is the default clone of HashSet?

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Q. Do we have get(Object o) method in HashSet.

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Q. What does Collections.emptySet() return?

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Q. What are the initial capacity and load factor of HashSet?

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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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