56. What is the output of this program?
    

    import java.util.*;
        public class vector_Example
        {
            public static void main(String args[]) 
            {
                Vector object = new Vector(6,3);
                object.addElement(new Integer(5));
                object.addElement(new Integer(7));
                object.addElement(new Integer(9));
                System.out.println(object.elementAt(2));
            }
        }
    

1. 1. 6, 3

   
   
   

   2. 5

   
   
   

   3. 7

   
   
   

   4. 9

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   object.elementAt(2) returns the value stored at index 2, which is 9.

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57. Which of these methods is used to add elements in vector at specific location?

1. 1. set()

   
   
   

   2. add()

   
   
   

   3. addElement()

   
   
   

   4. AddElement()

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   addElement() is used to add data in the vector, to obtain the data we use elementAt() and to first and last element we use firstElement() and lastElement() respectively.

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58. What is the name of a data member of class Vector which is used to store a number of elements in the vector?

1. 1. capacity

   
   
   

   2. elements

   
   
   

   3. length

   
   
   

   4. elementCount

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   elementCount

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59. Which of these is the interface of legacy?

1. 1. Hashtable

   
   
   

   2. HashMap

   
   
   

   3. Enumeration

   
   
   

   4. Map

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Enumeration

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60. Which of these are legacy classes?
    

1. 1. Vector

   
   
   

   2. Stack

   
   
   

   3. Hashtable

   
   
   

   4. All of Above

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Stack, Hashtable, Vector, Properties and Dictionary are legacy classes.

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