为什么界面变量默认为静态和最终？ [英] Why are interface variables static and final by default?

问题描述

为什么接口变量在Java中默认为静态和最终？

Why are interface variables static and final by default in Java?

推荐答案

来自Philip Shaw的Java界面设计常见问题解答：

From the Java interface design FAQ by Philip Shaw:

接口变量是静态的，因为Java接口本身无法实例化;必须在没有实例的静态上下文中分配变量的值。最终修饰符确保分配给接口变量的值是一个真正的常量，不能由程序代码重新赋值。

Interface variables are static because Java interfaces cannot be instantiated in their own right; the value of the variable must be assigned in a static context in which no instance exists. The final modifier ensures the value assigned to the interface variable is a true constant that cannot be re-assigned by program code.

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