How to Calculate Area and Perimeter of Rectangle in a Java Program

Program to demonstrate how to Calculate Area and Perimeter of Rectangle in Java.

 

package com.hubberspot.example;

// Import java.util.Scanner to read data from
// console
import java.util.Scanner;

public class RectangleAreaPerimeterDemo {

 public static void main(String[] args) {

  // Creating a Scanner object using a constructor
  // which takes the System.in object. There are various
  // constructors for Scanner class for different
  // purposes. We want to use Scanner class to read
  // data from console on the system, So we are using
  // a constructor which is taking an System.in object
  Scanner scanner = new Scanner(System.in);

  // Create three variables which will hold the
  // values for length, breadth , area and perimeter of Rectangle.
  int length = 0;
  int breadth = 0;
  int area = 0;
  int perimeter = 0;

  // prompt the user to enter value of length of
  // Rectangle 
  System.out.print("Enter the length of Rectangle : ");

  // store the length into length variable entered by user
  length = scanner.nextInt();

  // prompt the user to enter value of breadth of
  // Rectangle
  System.out.print("Enter the breadth of Rectangle : ");

  // store the breadth into breadth variable entered by user
  breadth = scanner.nextInt();

  // Calculate area of Rectangle by multiplying length into breadth.
  area = length * breadth;

  // Calculate perimeter of Rectangle by 2 * (length + breadth)
  perimeter = 2 * (length + breadth);

  // Output area and perimeter to the console
  System.out.println("Area of Rectangle is : " + area);
  System.out.println("Perimeter of Rectangle is : " + perimeter);
 }
}

Output of the program :