A good answer might be:

0: Amy
1: Bob
2: Deb

Sometimes you wish to insert an element into a Vector at a particular index. When an element is inserted at index the element previously at index is moved up to index+1, and so on until the element previously at size()-1 is moved up to size(). The size of the Vector has now increased by one, and the capacity will increase if more room is needed.

insertElementAt(Object element, int index)  // Inserts the element at index. 
                                            // Each element with an index 
                                            // equal or greater than index is 
                                            // shifted upward by one more than
                                            // its previous value. 

Inserting is different from setting an element. When setElementAt(objectReference, index ) is used, the object reference previously at index is replaced by the new objectReference. No other elements are effected, and the size does not change.

QUESTION 12:

Examine the following program. What will it print?

import java.util.* ; class VectorEg { public static void main ( String[] args) { Vector names = new Vector( 10 ); names.addElement( "Amy" ); names.addElement( "Bob" ); names.addElement( "Chris" ); names.addElement( "Deb" ); names.insertElementAt( "Elaine", 2); for ( int j=0; j < names.size(); j++ ) System.out.println( j + ": " + names.elementAt(j) ); } }