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

问题描述

为什么 Java 常量声明为静态的?

Why are java constants declared static ?

class Foo{
    static final int FII = 2 ;
}

在这我明白final的用法了吗?购买 为什么它必须是静态的?为什么它应该是一个类变量，而不是一个实例变量?

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，那么它显然不是一个常量.为 Math 的每个实例获得不同的 pi 值意味着什么(不是 Math 甚至允许构造实例)?或者对 String 的每个实例使用不同的不区分大小写的排序?

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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