John is a final year student of the SCOPE department at VIT$-$AP University. The placement

season is on and he will be sitting for the campus interviews. He and his friend Bob were

brushing up their Java concepts one day before the placements. Bob asked John to write a Java

program that utilizes the concept of an interface. Alice created an interface named Shape with

two methods as depicted below:

public double periTriangle $($double side$1,$ double side$2,$ double side$3)$; with three double

arguments. The method returns the perimeter of the triangle.

public double periRectangle $($double side$1,$ double side$2)$; with two double arguments.

The method returns the perimeter of the rectangle.

John attended Object Oriented Programming lectures at VIT$-$AP and he knows that he cannot

instantiate the Shape interface and so cannot access the member functions of the Shape

interface. So$,$ he created a class named Perimeter and is public that implements an interface

Shape. The Perimeter class provide the implementation $($calculates the perimeter$)$ of both the

methods of an interface and the perimeter is returned from the respective methods. In

Perimeter class, declare $4$ instance variables namely double side$1,$ double side$2,$ double side$3,$

and double perimeter and take the values of the variables double side$1,$ double side$2,$ double

side $3$ from the user. Create an object of the Perimeter class and access the instance methods

periTriangle and periRectangle. $($NOTE: For calculating the perimeter of a triangle use

the formula, perimeter $=$ side $1+$ side $2+$ side $3$ and for calculating the perimeter of a

rectangle use the formula perimeter side $1+$ side$2$