what is the answer to the question in the description

Question

Given the following class:

import java.util.ArrayList;

public class RectangleTester

{

     public static void main(String[ ] args)

     {

          ArrayList< Rectangle > shapes = new ArrayList< Rectangle >();

          shapes.add(new Rectangle(1, 1));

          shapes.add(new Rectangle(2, 2));

          shapes.add(new Rectangle(3, 3));

          shapes.add(new Rectangle(4, 4));

          Rectangle dataRecord;

          for(int index = 0; index < shapes.size(); index++)

          {

               dataRecord = shapes.get(index);

               dataRecord.calcRectArea();

               dataRecord.calcRectPerimeter();

               System.out.println("Area = " + dataRecord.getArea());

               System.out.println("Perimeter = " + dataRecord.getPerimeter());

          }

     }

}

Assume that getArea() returns the area of a rectangle and getPerimeter() returns the perimeter of a rectangle. What will print when index = 3?

a	Area = 9	Perimeter = 12
b	Area = 4	Perimeter = 8
c	Area = 16	Perimeter = 16
d	Area = 25	Perimeter = 20
e	Area = 1	Perimeter = 4

Answer 1

Dan B. is correct. When `index` is 3, `shapes.get(3)` is called. Since lists in java have zero-indexed (meaning they start at index 0 instead of index 1), `shapes.get(3)` is actually getting the fourth item, which is `Rectangle(4, 4))`. The perimeter of a rectangle with all sides length 4 is 16, and the area of a rectangle with all sides length 4 is also 16. Therefore, C is the correct answer.