为什么 System.Random 类不是静态的? [英] Why is the System.Random class not static?

问题描述

当您使用 System.Random 类时，您必须创建它的一个实例.为什么不是static?因为如果我想要0到9之间的随机数，我可以使用静态方法，System.Random.Next(int, int):

When you use the System.Random class, you must make an instance of it. Why is it not static? Because if I want a random number between 0 and 9, I can use the static method, System.Random.Next(int, int):

int ourRandomNumber = Random.Next(0,9);

那么为什么类不只是static?

推荐答案

如果它是静态的，您将无法使用不同的种子 - Random 实例会跟踪该状态.默认情况下 Random 使用当前时间作为种子，但重新使用特定的种子(即 new Random(42))允许您精确地重复随机数序列 - 它们将始终相同相同的种子.这方面在某些应用中非常重要.例如，我的世界.

You wouldn't be able to use different seeds if it were static - the Random instance keeps track of that state. By default Random uses the current time as seed, but re-using a particular seed (i.e. new Random(42)) allows you to exactly repeat the sequence of random numbers - they will always be the same for the same seed. This aspect is very important in some applications. For example, Minecraft.

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