public class SquareDemo {

  public static void main (String args []) {

     double leng = 2.5;
     double value;

     // create a circle object called mySquare with a lengius of 2.5
     Square mySquare = new Square(leng);

     // create a circle object called myOtherSquare with a lengius of 10.0
     Square myOtherSquare = new Square(10);

     // create a circle object called unitSquare with a default lengius of 1.0;
     Square unitSquare = new Square();

     // create a circle object called myLastSquare that is a copy of the Square mySquare
     Square myLastSquare = new Square(mySquare);

     // get the area of mySquare 
     value = mySquare.area();

     // print the area of mySquare
     System.out.println("The area is " + value);

     }     
}