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游泳池

package com.lovo;/** * 游泳池 *  * @author Carry * */public class Swimmingpool {
       private double r;// 游泳池半径    private double R;// 过道半径    private double circumference;// 周长    private double area;// 面积    /**     * 构造器     *      * @param r     */    public Swimmingpool(double r) {        this.r = r;        R = r + 3;        circumference = 2 * Math.PI * R;        area = Math.PI * R * R - Math.PI * r * r;    }    /**     * 过道的钱     *      * @param money     */    public void road(double money) {        double cost = area * money;        System.out.println("过道需要" + cost + "元");    }    /**     * 围墙需要的钱     *      * @param money     */    public void wall(double money) {        double cost = circumference * money;        System.out.println("围墙需要" + cost + "元");    }}

package com.lovo;public class Test01 {    public static void main(String[] args) {        Swimmingpool sp = new Swimmingpool(5);        sp.road(18);        sp.wall(5);    }}

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