class Circle
{
double r;
}
class Volum extends Circle{
double height;//柱体高度
double volu( double r, double height)
{this.height=height;
super.r=r;
return Math.PI*r*r*height;}//计算体积
}
public class test{
public static void main(String args[])
{
Volum c=new Volum();
System.out.println("圆柱体的体积为： "+c.volu(1,5));
}
}