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

1. 1. True

   
   
   

   2. False

   
   
   

   3. Only A

   
   
   

   4. A and B both

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   If we make a copy of array before any changes to the array the content will not change. Else the content of the array will undergo changes.

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

1. 1. O(2)

   
   
   

   2. O(nlogn)

   
   
   

   3. O(n)

   
   
   

   4. O(1)

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   ArrayList has O(1) complexity for accessing an element in ArrayList. O(n) is the complexity for accessing an element from LinkedList.

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

1. 1. AttibuteList

   
   
   

   2. SessionList

   
   
   

   3. RoleUnresolvedList

   
   
   

   4. Stack

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   SessionList is not an implementation of List interface. The others are concrete classes of List.

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9. How to remove duplicates from List?

1. 1. HashSet listToSet = duplicateList.toSet();

   
   
   

   2. HashSet listToSet = duplicateList.getSet();

   
   
   

   3. HashSet listToSet = new HashSet(duplicateList);

   
   
   

   4. HashSet listToSet = Collections.convertToSet(duplicateList);

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Duplicate elements are allowed in List. Set contains unique objects.

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10. How to sort elements of ArrayList?

1. 1. Sorter.sortAsc(listObj);

   
   
   

   2. listObj.sort();

   
   
   

   3. Collections.sort(listObj);

   
   
   

   4. Collection.sort(listObj);

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Collections provides a method to sort the list. The order of sorting can be defined using Comparator.

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