Top 50 Java Collections Framework Quiz

Top 50:Java Collections Framework Quiz

Are you ready to level up your Java skills? Take our Collections Framework 50 Quiz now and put your knowledge to the test! Designed to challenge both beginners and experienced coders, this quiz covers everything you need to know about managing object groups in Java.

 

With a series of thought-provoking questions, our Top 50 quiz will assess your understanding of key concepts like lists, sets, maps, and more. Whether you’re familiar with Java’s Collections Framework or just getting started, this Top 50 quiz is the perfect way to gauge your expertise and identify areas for improvement.

 

Don’t miss out on this opportunity to boost your Java proficiency! Take the Collections Framework Top 50 Quiz today and see how you stack up against your peers.

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1. Which of the following classes provides a thread-safe variant of HashSet?

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2. Which collection class allows you to access elements by their natural order or by a comparator provided at the time of creation?

3 / 50

3. What is the purpose of the method Collections.shuffle(List<?> list)?

4 / 50

4. What is the difference between fail-fast and fail-safe iterators?

5 / 50

5. What is the main advantage of using an EnumSet over a HashSet for storing enums?

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6. Which data structure is most suitable for implementing a priority queue?

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7. What is the purpose of the method Collections.singletonList(T o)?

8 / 50

8. Which of the following is true about the Iterator interface?

9 / 50

9. Which collection class is typically the best choice for implementing a LRU (Least Recently Used) cache?

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10. Which interface does not allow duplicate elements?

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11. Which method is used to add an element to a specific position in a List?

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12. Which of the following classes implements the List interface?

13 / 50

13. Which method is used to remove all elements from a collection?

14 / 50

14. Which of the following is a characteristic of a LinkedHashMap?

15 / 50

15. What will be the output of the following code?

List<Integer> list = new ArrayList<>(Arrays.asList(1, 2, 3, 4, 5));

list.subList(2, 4).clear();

System.out.println(list);

16 / 50

16. Which collection type would be best for storing a collection of unique elements with no particular order?

17 / 50

17. Which of the following statements is true regarding the List interface?

18 / 50

18. Which interface provides the ability to store elements in key-value pairs?

19 / 50

19. Which class is synchronized and hence thread-safe?

20 / 50

20. Which of the following is not a valid way to create an instance of a List?

21 / 50

21. What does the method Collections.unmodifiableList(list) do?

22 / 50

22. Which interface should be implemented to define a natural order for a custom class?

23 / 50

23. Which method would you use to remove the first occurrence of an element in a List?

24 / 50

24. What happens if you add a duplicate key to a HashMap?

25 / 50

25. Which interface should you implement to create a custom collection class that allows iteration over its elements?

26 / 50

26. Which of the following classes implements a Queue that processes elements in the order of their priority?

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27. Which method is used to obtain an immutable list containing multiple elements?

28 / 50

28. Which class is preferred for representing and manipulating sequences of characters?

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29. Which of the following collections allows duplicate elements?

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30. Which class would you use to implement a first-in, first-out (FIFO) queue?

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31. Which method of the Collections class can be used to make a collection thread-safe?

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32. Which of the following data structures is implemented by a PriorityQueue in Java?

33 / 50

33. What is the main characteristic of a LinkedHashSet?

34 / 50

34. Which collection should you use if you need a FIFO (first-in-first-out) ordering?

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35. Which method in the Collections class is used to sort a List?

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36. Which collection should you use to implement a stack?

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37. How can you make an existing collection immutable?

38 / 50

38. What is the default initial capacity of an ArrayList when it is created using the default constructor?

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39. Which interface does not extend the Collection interface?

40 / 50

40. What is the main difference between a HashSet and a TreeSet?

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41. What does the method remove(int index) do in an ArrayList?

42 / 50

42. Which of the following allows duplicate keys?

43 / 50

43. Which of the following is not a part of the Java Collections Framework?

44 / 50

44. Which of the following operations is not supported by an unmodifiable collection?

45 / 50

45. Which of the following methods would you use to ensure that a Map cannot be modified?

46 / 50

46. Which of the following interfaces provides a total ordering on its elements?

47 / 50

47. What is the time complexity of retrieving an element from a HashMap given the key?

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48. Which of the following classes is not a part of the Java Collections Framework?

49 / 50

49. Which class provides a thread-safe variant of ArrayList?

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50. Which of the following methods is not in the Collection interface?

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