私有最终字段也应该是静态的吗? [英] Should a private final field be static too?

问题描述

我想知道，如果我的班级中有此字段: private final int foo = ... ，是否应该将其放在静态 private static final int foo = ...?因为如果它是静态的，则对于我的类的所有实例都是通用的，并且永远不会改变.

I was wondering, if I have this field in my class : private final int foo = ..., should I put it in static private static final int foo = ...? Because if it's static, it's common to all the instances of my class, and will never change.

是否有理由不将其置于静态状态?还是我必须将其置于静态状态?

Is there a reason to not put it in static? Or do I have to put it in static?

推荐答案

如果类的每个实例的foo都应具有 same 不变值，则应使foo为final和static.如果您的类的每个实例可以为foo分配一个不同(但仍然是不变的)值，则该值应该只是最终值.

If every instance of your class should have the same immutable value for foo, then you should make foo final and static. If each instance of your class can have a different (but still immutable) value for foo, then the value should just be final.

但是，如果类的每个实例对于foo应该具有相同的不可变值，则它实际上是一个常量.按照惯例，通常编码如下:

However, if every instance of your class should have the same immutable value for foo, then it is a really a constant. By convention, that is typically coded as follows:

private static final int FOO = ...

请注意大写字母表示常量...

Note the caps to denote a constant...

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