java - "const"关键字的用途是什么？

Question

为什么const在Java中是保留关键字却没有作用？如果他们决定使用 final 而不是 const 有什么意义？

Answer 1

来自JLS :

The keywords const and goto are reserved, even though they are not currently used. This may allow a Java compiler to produce better error messages if these C++ keywords incorrectly appear in programs.

从历史的角度，我可以为您提供以下内容quote通过 Josh Bloch从 2003 年开始:

Josh Bloch: We do not have plans to add support for the const keyword to the Java language. It was a mixed blessing in C++; as you know, it's merely advisory, and can cast on or off. Gosling hated it, and did final instead. What you really want is "immutable," but it's a research problem to make this work properly.