为什么在允许某些Unicode字符的注释中执行Java代码？

问题：

The following code produces the output "Hello World!" 以下代码生成输出“Hello World！” (no really, try it). （不，真的，试试吧）。

public static void main(String... args) {

   // The comment below is not a typo.
   // \u000d System.out.println("Hello World!");
}

The reason for this is that the Java compiler parses the Unicode character \ as a new line and gets transformed into: 原因是Java编译器将Unicode字符\ 解析为新行并转换为：

public static void main(String... args) {

   // The comment below is not a typo.
   //
   System.out.println("Hello World!");
}

Thus resulting into a comment being "executed". 从而导致评论被“执行”。

Since this can be used to "hide" malicious code or whatever an evil programmer can conceive, why is it allowed in comments ? 由于这可以用来“隐藏”恶意代码或恶意程序员可以设想的任何东西， 为什么在评论中允许它 ？

Why is this allowed by the Java specification? 为什么Java规范允许这样做？

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解决方案：

参考一： https://stackoom.com/question/24vd5/为什么在允许某些Unicode字符的注释中执行Java代码
参考二： https://oldbug.net/q/24vd5/Why-is-executing-Java-code-in-comments-with-certain-Unicode-characters-allowed

来源：oschina

链接：https://my.oschina.net/u/3797416/blog/4306726