class   Circle
{   double  r ;  
     Circle( ) { public Circle(1.0)             } //无参构造方法，默认半径为1.0
Circle(double  a)  //有参构造方法
   {            （2）                 }
double   Area( )    {       return a*a*3.14                    }//返回面积
double   Girth(  )  {       return a*2*3.14                     }//返回周长
}
class Cone extends Circle{
    double h;
    Cone()
    {   super();
        h=1.0;
    }
    Cone(double rr,double hh){   
        rr=2;
hh=3;                      //为半径和高赋值        
}
    double V()  {       return rr*rr*3.14*hh/3                   }//返回圆锥的体积
    }
public class ConeTest{
public static void main(String args[])
{    Cone  c1=new Cone();
           System.out.println(c1.V());   
     Cone  c2=new Cone(1.0,3.0);
           System.out.println(c2.V());
      
}
}

有错= =16找不到符号