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import java.util.Scanner;
public class answer {
 private int bottle;
 private int lid;
 private int exchangeSum;
 private int leftBottles;
 private int leftLids;
 public static void main(String[] args) {
  for(;;) {
   System.out.println("请输入你的总金额:");
   Scanner sc = new Scanner(System.in);
   double price = sc.nextDouble();
   int btm = (int) (price/2);
   int sum = btm + new answer().getAnswser(btm, btm);
   System.out.println(price+"元共可买到"+sum+"瓶酒");
  }
 }
 public int getAnswser(int wine,int cover) {
  if(wine>=2||cover>=4) {
   bottle = wine/2;
   lid=cover/4;
   exchangeSum = bottle+lid;
   leftBottles = wine%2+exchangeSum;
      leftLids =cover%4+exchangeSum;
      System.out.println("本次使用了"+wine+"个酒瓶和"+cover+"个瓶盖,获得"
      +exchangeSum+"瓶啤酒,"+"剩余"+leftBottles+"个瓶子及"+leftLids+"个瓶盖");
      return exchangeSum+getAnswser(leftBottles, leftLids);
  }else {
   return 0;
  }
 }
}

结果是15瓶酒

 public static void main(String[] args) {
  Scanner scan = new Scanner(System.in);
  System.out.println("请输入金额：");
  double money = scan.nextDouble();
  int beer = (int) (money/2);
  int bottle =beer/2;
  int bottlecap = beer/4;
  System.out.println("可以买"+(beer+bottle+bottlecap)+"瓶");
 }

document.write("不知道");