Java啤酒问题

啤酒问题：

12块钱买啤酒，2块钱一瓶

两个空瓶换一瓶酒

四个瓶盖换一瓶酒

最后能买多少啤酒？

问题：统一换算成钱，再买酒，递归实现

package cn.edu.lcudcc;

public class BeerQuestion {

    // 定义一个静态的成员变量用于存储可以买的酒数量
    public static int totalNumber; // 总数量
    public static int lastBottleNumber; // 记录每次剩余的瓶子个数
    public static int lastCoverNumber; // 记录每次剩余的盖子个数

    public static void main(String[] args) {
        int money = 12;
        buy(money);
        System.out.println("totalNumber = " + totalNumber);
        System.out.println("lastBottleNumber = " + lastBottleNumber);
        System.out.println("lastCoverNumber = " + lastCoverNumber);
    }

    /**
     * 拿钱买酒
     * @param money
     */
    private static void buy(int money) {
        int buyNumber = money / 2;
        totalNumber += buyNumber;

        int coverNumber = lastCoverNumber + buyNumber;
        int bottleNumber = lastBottleNumber + buyNumber;

        int allMoney = 0;
        if(coverNumber >= 4) {
            allMoney += (coverNumber / 4) * 2;
        }
        lastCoverNumber = coverNumber % 4;

        if (bottleNumber >= 2){
            allMoney += (bottleNumber / 2) * 2;
        }
        lastBottleNumber = bottleNumber % 2;

        if(allMoney >= 2) {
            buy(allMoney);
        }
    }
}

输出结果：

totalNumber = 19
lastBottleNumber = 1
lastCoverNumber = 3