class Circle{

 double r;

 double pi=3.14;

 public Circle(double r) {

  this.r = r;

 }

 public void Getarea() {

  System.out.println("狗蛋同学算出来的圆的面积为:"+r*r*pi);

 }

 public void Circle(double r) {

  

  

 }

}

public class Dome {

          public static void main(String []args) {

          Circle c  = new Circle (5.0);

          test(c);

            }

          public static void test(Circle c) {

           c = new Circle(4.0);

           c.Getarea();

          }

}