if-else-else if [英] if-else-else if

问题描述

我是java的初学者，我正在做一些练习题来提高我的java技能。

I am a beginner in java and i am doing some practiceit questions to brush up on my java skills.

编写一个名为season的方法，它将两个整数作为参数表示一个月和一天，并返回一个字符串，表示该月和日的季节。假设月份被指定为1到12之间的整数（1月1，2月2，依此类推），月份的日期是1到31之间的数字。

Write a method named season that takes two integers as parameters representing a month and day and that returns a String indicating the season for that month and day. Assume that months are specified as an integer between 1 and 12 (1 for January, 2 for February, and so on) and that the day of the month is a number between 1 and 31.

如果日期介于12/16和3/15之间，则应返回Winter。如果日期在3/16到6/15之间，则应返回Spring。如果日期在6月16日到9月15日之间，则应返回夏季。如果日期在9月16日到12月15日之间，则应返回秋季。

If the date falls between 12/16 and 3/15, you should return "Winter". If the date falls between 3/16 and 6/15, you should return "Spring". If the date falls between 6/16 and 9/15, you should return "Summer". And if the date falls between 9/16 and 12/15, you should return "Fall".

public static String season(int month,int day){
   
    if(month>=9 && month<=12 && day==15||day==16){
        return "Fall";
    }
    else if (month>=4 && month<=6 && day==16||day==15){
       return "Spring";
     }
    else if (month>=6 && month<=9 && day==16||day==15){
         return "Summer";
     }
     else {
          return"Winter";

         
      }

  
}

但我没有得到输出。但它似乎对我来说。任何人都可以告诉我哪里出错了？

But i'm not getting the output.But it seems right to me.Anyone can tell me where did i go wrong?

推荐答案

|| 的优先级低于&& 并且您的条件看起来不正确 - 您可能想要写下这样的内容：

|| has lower precendence than && and your conditions don't look correct - you probably wanted to write something like:

if((month == 9 && day >= 16) //September, on or after the 16th
      || month == 10         //or October
      || month == 11         //or November
      || (month == 12 && day <=15)) { //or December, but before or on the 15th
    return "Fall";
}

（其他条件的评论相同）

(same comment for the other conditions)

你可以通过使用一点点破解来缩短它，但可读性可能不那么好（值得商榷）：

You could make it shorter by using a little hack, but readability is maybe not as good (debatable):

int mdd = month * 100 + day; //date in MDD format, for example 507 for May 7th

if (mdd >= 916 && mdd <= 1215) {
    return "Fall";
}

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