为什么为 Java 8 选择双冒号运算符？

Question

在 Java 8 之前，我的观察是引用成员方法的实际标准是使用 # 符号（例如 Object#toString()）。然后出现了 Java 8 ，它似乎没有理由选择 :: 运算符作为方法引用。

是否有关于为什么特别选择 :: 的官方解释或理由？

Answer 1

您可以找到 "official explanation or justification" from Brian Goetz。您应该阅读完整的讨论，但这是摘录：

The :: infix syntax:
   ClassName::methodName 
   ClassName<T>::methodName 
   ClassName::<U>genericMethodName 
works acceptably well. Some people like it, and some people hate it -- just like #. There's never going to be a perfect syntax for anything that makes everyone jump up in unison and say "yeah, that's it!" But :: is OK, and using up :: here is far better than using up #. (And, while this might look a little weird to C++ programmers, the overlap between the Java and C++ developer bases at this point is small enough that I don't think we should be too worried about that.)

为什么为 Java 8 选择双冒号运算符？

Why was the double colon operator chosen for Java 8?

java

syntax

operators

java-8