public class yy {
   
        
        public static void main(String[] args){
            yy myCircle=new yy();
        
            System.out.println
            ("The area of the circle of radius"+ myCircle. radius + "is" + myCircle. findArea())
            ;
        }
}
class y1
{
    double  radius=10.5;
    double findArea()
    {
    return radius*radius*3.14159;
    }
        
}

原谅新手！！！！！！！！