带种子的随机数 [英] random number with seed

问题描述

参考：链接文字

我无法理解以下内容，有人能为我提供以下声明的一些例子吗？

i cannot understand the following line , can anybody provide me some example for the below statement?

如果有两个Random的实例是使用相同的种子创建的，并且每个方法调用相同的序列，它们将生成并返回相同的数字序列

If two instances of Random are created with the same seed, and the same sequence of method calls is made for each, they will generate and return identical sequences of numbers

推荐答案

因为你问了一个例子：

import java.util.Random;
public class RandomTest {
    public static void main(String[] s) {
        Random rnd1 = new Random(42);
        Random rnd2 = new Random(42);

        System.out.println(rnd1.nextInt(100)+" - "+rnd2.nextInt(100));
        System.out.println(rnd1.nextInt()+" - "+rnd2.nextInt());
        System.out.println(rnd1.nextDouble()+" - "+rnd2.nextDouble());
        System.out.println(rnd1.nextLong()+" - "+rnd2.nextLong());
    }
}

两者随机实例将始终具有相同的输出，无论您运行它的频率如何，无论您使用什么平台或Java版本：

Both Random instances will always have the same output, no matter how often you run it, no matter what platform or what Java version you use:

30 - 30
234785527 - 234785527
0.6832234717598454 - 0.6832234717598454
5694868678511409995 - 5694868678511409995

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