class Circle
{
double r;

}
class Volum extends Circle{

double height;//柱體高度
double volu( double r, double height)
{this.height=height;
super.r=r;
return Math.PI*r*r*height;}//計(jì)算體積
}

public class test{
public static void main(String args[])
{
Volum c=new Volum();
System.out.println("圓柱體的體積為： "+c.volu(1,5));
}

}