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Java Collections Framework

Questions covering the Java Collections Framework including interfaces like Collection, List, Queue, Set, and implementations like HashSet, LinkedHashSet, TreeSet, and Vector

12 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of following methods is present in the Collection interface in Java?

  1. hashCode()
  2. hashNext()
  3. Next()
  4. AllRetain()
  5. ensureCapacity()
Question 2 Multiple Choice (Single Answer)

How many constructors are there for LinkedHashSet?

  1. 6
  2. 5
  3. 4
  4. 3
  5. 2
Question 3 Multiple Choice (Single Answer)

What are the default values for initial capacity and load factor for HashSet?

  1. Initial capacity : 12
    Load factor : 0.75
  2. Initial capacity : 14
    Load factor : 0.75
  3. Initial capacity : 16
    Load factor : 0.75
  4. Initial capacity : 16
    Load factor : 0.65
  5. Initial capacity : 12
    Load factor : 0.65
Question 4 Multiple Choice (Single Answer)

Which of the following methods is present in List interface?

  1. subList(int startindex, int endindex)
  2. previousIndex()
  3. nextIndex()
  4. hasPrevious()
  5. hasMiddle()
Question 5 Multiple Choice (Single Answer)

Which of the following methods is present in the vector class in Java?

  1. trimToSize()
  2. setElement(index,Element)
  3. Seach()
  4. Empty()
  5. Remove()
Question 6 Multiple Choice (Single Answer)

Which of the following statements is true for methods in queue in Java Collections?

  1. Element() method retrieves and removes the head of the queue and returns Null if the queue is empty.
  2. Element() method retrieves, but doesn’t remove the head of the queue and returns Null if the queue is empty.
  3. Element() method retrieves and removes the head of the queue and throws exception if the queue is empty.
  4. Element() method retrieves, but doesn’t remove the head of the queue and throws exception if the queue is empty.
  5. Element() method removes the head of the queue and throws exception if the queue is empty.
Question 7 Multiple Choice (Single Answer)

Which of the following statements is correct for the methods in queue in Java Collections?

  1. Poll() method retrieves and removes the head of the queue or returns Null if the queue is empty.
  2. Remove() method retrieves and removes the head of the queue or returns Null if the queue is empty.
  3. Poll() method retrieves and removes the head of the queue or throws an exception if the queue is empty.
  4. Remove() method retrieves and removes the head of the queue, but doesn’t return anything if the queue is empty.
  5. Poll() method retrieves the head of the queue or returns Null if the queue is empty.
Question 8 Multiple Choice (Single Answer)

Which of the following statements is correct for methods in the queue?

  1. Peek() method retrieves and removes the head of the queue and returns Null if the queue is empty.
  2. Peek() method retrieves and removes the head of the queue and returns nothing if the queue is empty.
  3. Peek() method retrieves, but doesn’t remove the head of the queue and returns Null if the queue is empty.
  4. Peek() method retrieves and removes the head of the queue and throws an exception if the queue is empty.
  5. Peek() method retrieves, but doesn’t remove the head of the queue and throws an exception if the queue is empty.
Question 9 Multiple Choice (Single Answer)

How many constructors are there of TreeSet class?

  1. 6
  2. 5
  3. 4
  4. 3
  5. 2
Question 10 Multiple Choice (Single Answer)

How many constructors are there of HashSet?

  1. 6
  2. 5
  3. 4
  4. 3
  5. 2
Question 11 Multiple Choice (Single Answer)

Which of the following methods is not present in the List interface?

  1. indexOf(Element : e)
  2. Setthere(index,element)
  3. Get(index)
  4. Remove(index)
  5. Merge(c:collection,c1:collection)
Question 12 Multiple Choice (Single Answer)

Which of the following methods is not present in the Java Collections interface?

  1. retainAll(collection c)
  2. toArray()
  3. containsAll()
  4. addAll(Collection c)
  5. First()
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