在 Java 中实现常量的最佳方法是什么? [英] What is the best way to implement constants in Java?

问题描述

我见过这样的例子:

public class MaxSeconds {
   public static final int MAX_SECONDS = 25;
}

并假设我可以有一个 Constants 类来包装常量，将它们声明为 static final.我几乎不知道 Java 并且想知道这是否是创建常量的最佳方式.

and supposed that I could have a Constants class to wrap constants in, declaring them static final. I know practically no Java at all and am wondering if this is the best way to create constants.

推荐答案

这是完全可以接受的，甚至可能是标准.

That is perfectly acceptable, probably even the standard.

(public/private) static final TYPE NAME = VALUE;

其中 TYPE 是类型，NAME 是所有大写的名称，下划线表示空格，VALUE 是常量值；

where TYPE is the type, NAME is the name in all caps with underscores for spaces, and VALUE is the constant value;

我强烈建议不要将常量放在它们自己的类或接口中.

I highly recommend NOT putting your constants in their own classes or interfaces.

附带说明:声明为 final 且可变的变量仍然可以更改；但是，变量永远不能指向不同的对象.

As a side note: Variables that are declared final and are mutable can still be changed; however, the variable can never point at a different object.

例如:

public static final Point ORIGIN = new Point(0,0);

public static void main(String[] args){

    ORIGIN.x = 3;

}

这是合法的，ORIGIN 将是 (3, 0) 处的一个点.

That is legal and ORIGIN would then be a point at (3, 0).

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