Java练习题11

package bzu.info.com;public class Circle {public double getArea(double r){return 3.14*r*r;}}package bzu.info.software;import bzu.info.com.Circle;public class Cylinder {Circle circle=new Circle();public double getVolume(double h){return (circle.getArea(2.0)*h);}}package bzu.info.software;public class A {public static void main(String[] args) {Cylinder cylinder=new Cylinder();System.out.println("体积为"+cylinder.getVolume(3.0));}}