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Discussion :: Objects and Collections

  1. What will be the output of the program?

      import java.util.*;
  class H 
  {  
     public static void main (String[] args)      
     {         
        Object x = new Vector().elements();                  
        System.out.print((x instanceof Enumeration)+",");          
        System.out.print((x instanceof Iterator)+",");          
        System.out.print(x instanceof ListIterator);   
   }  
}

    2. A.

    Prints: false,false,false
    B.

    Prints: false,false,true
    C.

    Prints: false,true,false
    D.

    Prints: true,false,false

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    Answer : Option D

    Explanation :

    The Vector.elements method returns an Enumeration over the elements of the vector. Vector implements the List interface and extends AbstractList so it is also possible to get an Iterator over a Vector by invoking the iterator or listIterator method.

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