Create a program in java that calculates area and perimeter of a square - use a class and test program to calculate the area and perimeter; assume length of square is 7 ft.

Following are the program in Java

class abc / / class abc

{

public void area (int s) / / function area

{

s=s*s; / / calculate area

System. out. println (" The area is:" + s + " ft"); / / display the area

}

public void perimeter (int s) / /function perimeter

{

s=4*s; //calculate perimeter.

System. out. println (" The perimeter is:" + s + " ft"); / /display the perimeter

}

}

public class Main / /class main

{

public static void main (String[] args) / / main function

{

abc ob=new abc (); / / creating instance of class abc

ob. area (7); / / calling function area

ob. perimeter (7); / / calling function perimeter

}

}

Output:

The area is: 49 ft

The perimeter is:28 ft

Explanation:

In this program we create the class "abc". We declared two function in the class "abc" i. e "area" and "perimeter" which is calculating the area and perimeter of a square and print them, from the main function we create a object of class "abc" i. e "ob" which called the function area and perimeter.