if、switch嵌套案例

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public class test4 {     public static void main(String[] args) {           System.out.println("请输入消费金额：");         Scanner input =  new Scanner(System.in);         int money = input.nextInt();             System.out.println("是否参加优惠换购活动：");         System.out.println("1:满50元，加2元换购百事可乐饮料1瓶");         System.out.println("2：满100元，加3元换购500ml可乐一瓶");         System.out.println("3：满100元，加10元换购5公斤面粉");         System.out.println("4：满200元，加10元可换购1个苏泊尔炒菜锅");         System.out.println("5：满200元，加20元可换购欧莱雅爽肤水一瓶");         System.out.println("0：不换购");             if (money>=50 && money<100){             System.out.println("请选择：");             int num = input.nextInt();             switch (num){                 case 0:                     System.out.println("本次消费金额："+money);                     System.out.println("不换购！");                     break;                 case 1:                     System.out.println("本次消费金额："+(money+2));                     System.out.println("成功换购百事可乐一瓶！");                     break;                 default:                     System.out.println("本次消费不足！");                     break;             }         }else if(money>=100 && money<200){             System.out.println("请选择：");             int num = input.nextInt();             switch (num){                 case 0:                     System.out.println("本次消费金额："+money);                     System.out.println("不换购！");                     break;                 case 1:                     System.out.println("本次消费金额："+(money+2));                     System.out.println("成功换购百事可乐一瓶！");                     break;                 case 2:                     System.out.println("本次消费金额："+(money+3));                     System.out.println("成功换购500ml可乐一瓶！");                     break;                 case 3:                     System.out.println("本次消费金额："+(money+10));                     System.out.println("成功换购5公斤面粉！");                     break;                 default:                     System.out.println("本次消费不足！");                     break;             }         }else if (money>=200){             System.out.println("请选择：");             int num = input.nextInt();             switch (num){                 case 0:                     System.out.println("本次消费金额："+money);                     System.out.println("不换购！");                     break;                 case 1:                     System.out.println("本次消费金额："+(money+2));                     System.out.println("成功换购百事可乐一瓶！");                     break;                 case 2:                     System.out.println("本次消费金额："+(money+3));                     System.out.println("成功换购500ml可乐一瓶！");                     break;                 case 3:                     System.out.println("本次消费金额："+(money+10));                     System.out.println("成功换购5公斤面粉！");                     break;                 case 4:                     System.out.println("本次消费金额："+(money+10));                     System.out.println("成功换购sub铁锅！");                     break;                 case 5:                     System.out.println("本次消费金额："+(money+20));                     System.out.println("成功换购欧莱雅！");                     break;                 default:                     System.out.println("本次消费不足！");                     break;             }         }else {             System.out.println("本次消费不足！");         }       } }