6. Which of these method is used to remove all keys/values pair from the invoking map?

1. 1. removeAll()

   
   
   

   2. clear()

   
   
   

   3. remove()

   
   
   

   4. delete()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   remove()

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7. Which of these classes provide implementation of map interface?

1. 1. DynamicList

   
   
   

   2. ArrayList

   
   
   

   3. LinkedList

   
   
   

   4. HashMap

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   AbstractMap, WeakHashMap, HashMap and TreeMap provide implementation of map interface.

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8. What is the output of this program?
   

   import java.util.*;
       public class Linkedlist_Example 
       {
           public static void main(String args[]) 
           {
               LinkedList object = new LinkedList();
               object.add("I");
               object.add("L");
               object.add("U");
               object.removeFirst();
               System.out.println(object);
           }
       }
   

1. 1. [I, L, U]

   
   
   

   2. [I, L]

   
   
   

   3. [L, U]

   
   
   

   4. [I, U]

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   [L, U]

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9. Which of this method is used to change an element in a LinkedList Object?

1. 1. redo()

   
   
   

   2. add()

   
   
   

   3. change()

   
   
   

   4. set()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   An element in a LinkedList object can be changed by first using get() to obtain the index or location of that object and the passing that location to method set() along with its new value.

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10. What is the output of this program?
    

    import java.util.*;
        public class Linkedlist_Example
        {
            public static void main(String args[]) 
            {
                LinkedList object = new LinkedList();
                object.add("O");
                object.add("V");
                object.add("E");
                object.addFirst("L");
                System.out.println(object);
            }
        }
    

1. 1. [L]

   
   
   

   2. [L, O]

   
   
   

   3. [L, O, V]

   
   
   

   4. [L, O, V, E]

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   object.addFirst(“L”) method is used to add ‘L’ to the start of a LinkedList object obj.

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