为什么这段代码使用随机字符串打印“hello world"? [英] Why does this code using random strings print "hello world"?

问题描述

以下打印语句将打印hello world".谁能解释一下?

The following print statement would print "hello world". Could anyone explain this?

System.out.println(randomString(-229985452) + " " + randomString(-147909649));

和 randomString() 看起来像这样:

public static String randomString(int i)
{
    Random ran = new Random(i);
    StringBuilder sb = new StringBuilder();
    while (true)
    {
        int k = ran.nextInt(27);
        if (k == 0)
            break;

        sb.append((char)('`' + k));
    }

    return sb.toString();
}

推荐答案

当 java.util.Random 的实例使用特定的种子参数(在本例中为 -229985452 或 -147909649)，它遵循随机数生成算法从该种子值开始.

When an instance of java.util.Random is constructed with a specific seed parameter (in this case -229985452 or -147909649), it follows the random number generation algorithm beginning with that seed value.

用相同的种子构造的每个Random每次都会生成相同的数字模式.

Every Random constructed with the same seed will generate the same pattern of numbers every time.

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