JDK dateformater解析德语语言环境中的DayOfWeek，java8 vs java9

问题描述

我在Java 8（1.8.0_77）和Java 9（Java HotSpot（TM）64位服务器VM（构建9 + 181，混合模式））中尝试了一些代码。

  DateTimeFormatter dtf = DateTimeFormatter.ofPattern（eee，Locale.GERMAN）; 
 DayOfWeek mo = dtf.parse（Mo，DayOfWeek :: from）; 
 System.out.println（mo =+ mo）; 
  

我对这些类的细节并不太熟悉，但在Java 8中这是有效的，打印：

在Java 9中，但它失败

任何想法，这是可重现的吗？

因此，在使用此代码格式化：
时：

  DateTimeFormatter dtf = DateTimeFormatter.ofPattern（eee，Locale.GERMAN）; 
 String format = dtf.format（DayOfWeek.MONDAY）; 
 System.out.println（format =+ format）; 
  

jdk1.8.0-77：

jdk-9（build 9 + 181）

解决方案

这似乎出现在

编辑/注意 ：由@链接ManiGrover，对此类实施提出了类似的警告离子 -

I have tried some code in Java 8 (1.8.0_77) and Java 9 (Java HotSpot(TM) 64-Bit Server VM (build 9+181, mixed mode))

DateTimeFormatter dtf = DateTimeFormatter.ofPattern("eee", Locale.GERMAN);
DayOfWeek mo = dtf.parse("Mo", DayOfWeek::from);
System.out.println("mo = " + mo);

I am not too familiar with details of those classes, but in Java 8 this works, printing:

In Java 9, however it fails

Any ideas, is this reproducible?

so, when formating:using this code:

DateTimeFormatter dtf = DateTimeFormatter.ofPattern("eee", Locale.GERMAN);
String format = dtf.format(DayOfWeek.MONDAY);
System.out.println("format = " + format);

jdk1.8.0-77:

jdk-9 (build 9+181)

解决方案

This seems to be there in java-9 due to the current implementation of CLDR date-time-patterns with the implementation of JEP - 252 which states that

---

And to second the data part of it, the international components for Unicode in German locale which has the following relevant information can justify that the behavior is intentional -

Edit/Note: As linked by @ManiGrover, the migration guide states a similar warning for such implementations -

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