为什么java常量声明为static？ [英] why are java constants declared static?

问题描述

为什么java常量声明为static？

Why are java constants declared static ?

class Foo{
    static final int FII = 2 ;
}

在此我理解使用final？为什么它必须是静态的？为什么它应该是类变量，而不是实例变量？

In this I understand the use of final? Buy why does it have to be static? Why should it be a class variable, and not an instance variable?

推荐答案

如果它可能因类的实例而异，那么它显然不是常数。为每个 Math 的实例获取不同的pi值意味着什么（不是 Math 甚至允许实例被建造）？或者 String 的每个实例的不区分大小写排序？

If it could vary by the instance of a class, then it's clearly not a constant. What would it mean to get a different value of pi for each instance of Math (not that Math even allows instances to be constructed)? Or a different case insensitive ordering for each instance of String?

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