Program to demonstrate the use of other class

/* Program to demonstrate the use of  other class.
   Call this file RectangleDemo1.java */

class Rectangle
{
    int length;
    int width;
}

// This class declares an object of type Rectangle.

class RectangleDemo1
{
    public static void main(String args[])
    {
        Rectangle rect1 = new Rectangle();
        Rectangle rect2 = new Rectangle();
        int area;
   
        //assign values to rect1's instance variables
        rect1.length= 20;
        rect1.width=15;

        //assign different values to rect2's instance variables
        rect2.length= 25;
        rect2.width=17;

        // compute area of first rectangle
        area= rect1.length* rect1.width;
        System.out.println(" Area of Rectangle (length : "+rect1.length+" , width : "+rect1.width+") is : "+area);


        // compute area of second rectangle
        area= rect2.length* rect2.width;
        System.out.println(" Area of Rectangle (length : "+rect2.length+" , width : "+rect2.width+") is : "+area);
    }
}