程序显示缺少语句。为什么会出现这个错误？

huangapple
go评论93阅读模式
英文:

The program is showing a missing statement . Why is this error coming?

问题

static String dayOfProgrammer(int year) {
if (year == 1918) {
String date = "26:08:" + year;
return date;
}
if (year < 1918 || year > 1918) {
if (year % 4 == 0) {
String date = "12:09:" + year;
return date;
} else {
String date = "13:09:" + year;
return date;
}
}
}

英文: 
  1.  static String dayOfProgrammer(int year) {
  2.         if(year==1918){
  3.         String date= &quot;26:08:&quot;+year;
  4.         return date;
  5.         }
  6.          if(year&lt;1918|| year&gt;1918){
  7.             if(year%4==0){
  8.                 String date= &quot;12:09:&quot;+year;
  9.                 return date;
  10.             }
  11.             else{
  12.                 String date= &quot;13:09:&quot;+year;
  13.                 return date;
  14.             }
  15.         }
  17.     }

> Blockquote the method accepts an integer value "year" and should return a String value "date". but due to so issue ,it showcases a runtime error of missing return statement when tested against multiple test cases.

答案1

得分: 2

The compiler cannot guarantee that all paths return a value. Change your statement if(year&lt;1918|| year&gt;1918) to an else, and all paths will return:

  1. static String dayOfProgrammer(int year) {
  2.     if (year == 1918) {
  3.         String date = "26:08:" + year;
  4.         return date;
  5.     } else {
  6.         if (year % 4 == 0) {
  7.             String date = "12:09:" + year;
  8.             return date;
  9.         } else {
  10.             String date = "13:09:" + year;
  11.             return date;
  12.         }
  13.     }
  14. }
英文:

The compiler can not guarantee all paths return a value. Switch your statementif(year&lt;1918|| year&gt;1918) for an else and all paths will return:

  1. static String dayOfProgrammer(int year) {
  2.     if(year==1918){
  3.     String date= &quot;26:08:&quot;+year;
  4.     return date;
  5.     }
  6.     else{
  7.         if(year%4==0){
  8.             String date= &quot;12:09:&quot;+year;
  9.             return date;
  10.         }
  11.         else{
  12.             String date= &quot;13:09:&quot;+year;
  13.             return date;
  14.         }
  15.     }
  17. }

答案2

得分: 0

上一个答案来自 @HaroldH，是正确的，但我建议使用更简单的布局。

  1. static String dayOfProgrammer(int year) {
  2.     if (year == 1918) {
  3.         return "26:08:" + year;
  4.     }
  5.     else if (year % 4 == 0) {
  6.         return "12:09:" + year;
  7.     }
  8.     else {
  9.         return "13:09:" + year;
  10.     }
  11. }

或者（因为在return之后没有需要else）

  1. static String dayOfProgrammer(int year) {
  2.     if (year == 1918) {
  3.         return "26:08:" + year;
  4.     }
  5.     if (year % 4 == 0) {
  6.         return "12:09:" + year;
  7.     }
  8.     return "13:09:" + year;
  9. }

这两个版本的简单布局使得控制流在一瞥之间就能看清楚，并且你可以看到总是会执行一个return。

else if (...) 的放置在一行上，不会导致进一步的缩进，强调了代码在选择不同选项之间做了一个简单的顺序选择。

实际上你不需要else - 就像第二个例子中一样。我认为在这种情况下我更喜欢第一个，但没有硬性规定；重要的是最终代码的透明度。

你会注意到我删除了data 变量；它们在这里没有真正的用途。

英文:

The previous answer from @HaroldH is correct, but I'd suggest a simpler layout.

  1. static String dayOfProgrammer(int year) {
  2.     if (year == 1918) {
  3.         return &quot;26:08:&quot; + year;
  4.     }
  5.     else if (year%4 == 0) {
  6.         return &quot;12:09:&quot; + year;
  7.     }
  8.     else {
  9.         return &quot;13:09:&quot; + year;
  10.     }
  11. }

or even (since there's no need for the 'else' after a 'return')

  1. static String dayOfProgrammer(int year) {
  2.     if (year == 1918) {
  3.         return &quot;26:08:&quot; + year;
  4.     }
  5.     if (year%4 == 0) {
  6.         return &quot;12:09:&quot; + year;
  7.     }
  8.     return &quot;13:09:&quot; + year;
  9. }

The simpler layout of these two versions makes the control-flow obvious at a glance, and you can see there is always a return executed.

The placement of 'else if (…)' on one line that does not cause further indentation emphasizes that the code is making a simple sequence of choices between alternatives.

You don't actually need the 'else' - as in the second example. I regard that choice here as a matter of taste; I think I prefer the first in this case, but there are no hard-and-fast rules; what matters is the transparency of the resulting code.

You'll note I eliminated the 'data' variables; they served no real purpose here.

huangapple
  • 本文由 发表于 2020年8月9日 05:01:33
  • 转载请务必保留本文链接：https://go.coder-hub.com/63320197.html
  • java
  • methods
  • string
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