Java program to calculate area of rectangle

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

Java program to calculate area of rectangle

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

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