Java program to calculate area of rectangle

Let’s learn java program to calculate area of rectangle.

Java program to calculate area of rectangle

Write a program to calculate area of rectangle is the most common interview question.

To calculate area of rectangle first user enters the length and width of a rectangle using nextDouble() method of Scanner class.

Java program to calculate area of rectangle

Now this length and width of a rectangle values are stored in two variables “length” and “width” of data type double. Then using above user entered values we calculate area of rectangle using below formula,

area = length * width

Here’s the program to calculate area of rectangle using scanner.

import java.util.Scanner;
public class RectangleArea
{
   public static void main(String[] args)
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter length of rectangle: ");
      double length = sc.nextDouble();
      System.out.println("Please enter width of rectangle: ");
      double width = sc.nextDouble();
      double area = length * width;
      System.out.println("Area of rectangle is: " + area);
      sc.close();
   }
}

Output:

Please enter length of rectangle: 2
Please enter width of rectangle: 5
Area of rectangle is: 10.0


Similarly above java program can be executed without using Scanner class.

class RectangleArea
{
   public static void main (String[] args)
   {
      double length = 2.0;
      double width = 5.0;
      double area = length * width;
      System.out.println("Area of rectangle is: " + area);
   }
}

Output:

Area of rectangle is: 10.0


Also read – preface to java virtual machine and architecture