在Math.random()上设置种子 [英] Set seed on Math.random()

问题描述

我需要在调用Math.random()的Java代码上编写一些junit测试.我知道如果实例化我自己的Random对象以产生可重复的结果，则可以设置种子.有没有办法对Math.random()执行此操作?

I need to write some junit tests on Java code that calls Math.random(). I know that I can set the seed if I was instantiating my own Random object to produce repeatable results. Is there a way to do this also for Math.random() ?

推荐答案

方法Math.random()使用私有静态字段:

The method Math.random() uses a private static field:

private static Random randomNumberGenerator;

如果您确实确实需要将其设置为new Random(CONSTANT_SEED)(例如，您需要JUNit无法控制的测试代码)，则可以使用 reflection .

If you really really need to set this to a new Random(CONSTANT_SEED) (for instance you need to JUNit test code which you have no control over) you could do so by using reflection.

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