JAVA Collections-framework Online Test

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Instructions:

  • Total number of questions: 10.
  • Time allotted: 10 minutes.
  • Each question carries 1 mark.
  • No negative marks.
  • DO NOT refresh the page.
  • All the best :-)

What You Will Learn:

This Java Collections Framework Online Test helps you to Boost your Knowledge in Java. In this test, we cover topics in the form of questions like:
  • Collection framework hierarchy: Collection, List, Set, Queue, and Map interfaces.
  • ArrayList (fast random access O(1)) vs LinkedList (fast node insertions/deletions O(1)).
  • Set implementations: unordered HashSet vs sorted TreeSet (Red-Black tree) vs LinkedHashSet.
  • HashMap key-value architecture, bucket hashing, null key support, and load factors.
  • The hashCode() and equals() contract for custom object keys.
  • Fail-fast iterators, ConcurrentModificationException, and Comparable vs Comparator sorting.

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