求高手给我个参考代码，我做半天没做出来。java的一个换购系统，题目如下

import java.util.Scanner; public class ChangeGoods { public static void main(String[] args) { System.out.println("输入消费金额："); Scanner scanner = new Scanner(System.in); String money = scanner.next(); int spendMoney = Integer.parseInt(money); System.out.println( "是否参加优惠换购活动?\n" + "1：满50元，加2元换购百事可乐饮料1瓶\n" + "2：满100元，加3元换购500ml可乐一瓶\n" + "3：满100元，加10元换购5公斤面粉\n" + "4：满200元，加10元可换购1个苏泊尔炒菜锅\n" + "5：满200元，加20元可换购欧莱雅爽肤水一瓶\n" + "0：不换购\n" + "请选择：" ); Scanner scannerInput = new Scanner(System.in); String select = scanner.next(); int option = Integer.parseInt(select); switch (option) { case 0: System.out.println("本次消费总金额：" + money); break; case 1: if(spendMoney>=50){ System.out.println("本次消费总金额：" + (spendMoney + 2) ); System.out.println("成功换购：百事可乐饮料1瓶"); } break; case 2: if(spendMoney>=100){ System.out.println("本次消费总金额：" + (spendMoney + 3) ); System.out.println("成功换购：500ml可乐一瓶"); } break; case 3: if(spendMoney>=100){ System.out.println("本次消费总金额：" + (spendMoney + 10) ); System.out.println("成功换购：5公斤面粉"); } break; case 4: if(spendMoney>=200){ System.out.println("本次消费总金额：" + (spendMoney + 10) ); System.out.println("成功换购：1个苏泊尔炒菜锅"); } break; case 5: if(spendMoney>=200){ System.out.println("本次消费总金额：" + (spendMoney + 20) ); System.out.println("成功换购：欧莱雅爽肤水一瓶"); } break; default: break; } } }

赋值3个，分别消费值，加的钱（extra)和选择项目

if money>=50输出各语句

计算总金额然后输出

SWITCH1.2.3等

基本思路吧。

两个消费满100元，题目是不是错了？