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));
	}

}