Java 解惑：Random 种子的作用、含参与不含参构造函数区别

        Random random = new Random();
        Random random2 = new Random(50);

public Random() {
    setSeed(System.nanoTime() + seedBase);
    ++seedBase;
}

public Random(long seed) {
    setSeed(seed);
}

public synchronized void setSeed(long seed) {
    this.seed = (seed ^ multiplier) & ((1L << 48) - 1);
    haveNextNextGaussian = false;
}

protected synchronized int next(int bits) {
    seed = (seed * multiplier + 0xbL) & ((1L << 48) - 1);
    return (int) (seed >>> (48 - bits));
}

public int nextInt(int n) {
    if (n <= 0) {
        throw new IllegalArgumentException("n <= 0: " + n);
    }
    if ((n & -n) == n) {
        //调用 next()
        return (int) ((n * (long) next(31)) >> 31);
    }
    int bits, val;
    do {
        bits = next(31);
        val = bits % n;
    } while (bits - val + (n - 1) < 0);
    return val;
}

//也是调用的 next()
public boolean nextBoolean() {
    return next(1) != 0;
}

@Test
public void testRandomParameter(){
    System.out.println("Random 不含参构造方法：");
    for (int i = 0; i < 5; i++) {
        Random random = new Random();
        for (int j = 0; j < 8; j++) {
            System.out.print(" " + random.nextInt(100) + ", ");
        }

        System.out.println("");
    }

    System.out.println("");

    System.out.println("Random 含参构造方法：");
    for (int i = 0; i < 5; i++) {
        Random random = new Random(50);
        for (int j = 0; j < 8; j++) {
            System.out.print(" " + random.nextInt(100) + ", ");
        }
        System.out.println("");
    }
}