Java List Interface

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Question 1

Which of the following classes implement the List interface in Java?

  • HashMap

  • HashSet

  • ArrayList

  • TreeMap

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Question 2

Which class among ArrayList, LinkedList, Vector, and Stack is synchronized (thread-safe)?

  • ArrayList



  • LinkedList

  • Vector

  • None of the above

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Question 3

What is the time complexity of inserting an element at the beginning of an ArrayList?

  • O(1)


  • O(n)

  • O(log n)

  • O(n log n)

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Question 4

Which data structure is best for implementing a LIFO (Last In First Out) operation in Java?

  • Queue


  • Stack

  • LinkedList

  • PriorityQueue

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Question 5

Which of the following allows fast insertions and deletions at both ends?

  • ArrayList


  • LinkedList

  • Vector

  • Stack

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Question 6

What happens if you try to access an invalid index in an ArrayList?

  • It returns null

  • It throws ArrayIndexOutOfBoundsException

  • It throws NullPointerException

  • It throws IndexOutOfBoundsException

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Question 7

How do you retrieve the top element from a Stack without removing it?

  • pop()

  • peek()

  • top()

  • get()

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Question 8

Which collection should you prefer when frequent insertions and deletions are required in the middle of the list?

  • ArrayList

  • Vector

  • LinkedList

  • Stack

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Question 9

Which collection type does NOT allow random access to its elements?

  • ArrayList

  • HashSet

  • LinkedList

  • TreeSet

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There are 9 questions to complete.

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