生成相同的随机数序列 [英] Generation of the same sequence of random numbers

问题描述

我想在java中生成随机数，我知道我应该使用像Math.random（）这样的现有方法，但是，我的问题是：每次运行我的应用程序时，如何生成相同的数字序列？
示例：生成的序列是：0.9,0.08,0.6
所以我希望每次执行此方法时都会生成此序列..

I want to generate random numbers in java, I know I should use existing methods like Math.random(), however, my question is: how can I generate the same sequence of numbers, each time I run my application? example: the generated sequence is: 0.9, 0.08,0.6 so I want that this sequence will be generated every time I execute this method..

推荐答案

当然 - 只需创建一个 随机 而不是使用 Math.random（），并始终指定相同的种子：

Sure - just create an instance of Random instead of using Math.random(), and always specify the same seed:

Random random = new Random(10000); // Or whatever seed - maybe configurable
int diceRoll = random.nextInt(6) + 1; // etc

请注意，如果您的应用程序涉及多个线程会变得更难，因为时间变得更少可预测。

Note that it becomes harder if your application has multiple threads involved, as the timing becomes less predictable.

这利用了 Random 作为伪随机数生成器 - 换句话说，每当你要求它获得一个新结果时，它会操纵内部状态给你一个随机序列，但知道种子（或确实是当前的内部状态）它完全可以预测。

This takes advantage of Random being a pseudo-random number generator - in other words, each time you ask it for a new result, it manipulates internal state to give you a random-looking sequence, but knowing the seed (or indeed the current internal state) it's entirely predictable.

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