Question

我执行了这堆代码：

int newOrderLow = ThreadLocalRandom.current().nextInt(50, shipCapacity / 3);
int newOrderUp = ThreadLocalRandom.current().nextInt(newOrderLow, shipCapacity + 1); // not lower than lower value
int newOrderMid = ThreadLocalRandom.current().nextInt(newOrderLow, newOrderUp + 1); // in between
        
Log.d(TAG, "New Order: {" + newOrderLow + ", " + newOrderMid + ", " + newOrderUp + "}");

并开始调试它。例如，当我将shipCapacity设置为600时，我在控制台中记录了这些数字：

New Order: {493, 772, 672}

有一点是上限不在[较低值范围内; shipCapacity + 1]，另一个是中间值结果。那么问题是什么？如何使用ThreadLocalRandom正确生成随机整数？

Answer 1

您可能需要考虑运行以下测试代码：

    @Test
    public void test1() {
        final int shipCapacity = 600;
        for (int i = 0; i < 1000000; i++) {
            int newOrderLow = ThreadLocalRandom.current().nextInt(50, shipCapacity / 3);
            int newOrderUp = ThreadLocalRandom.current().nextInt(newOrderLow, shipCapacity + 1); // not lower than lower value
            int newOrderMid = ThreadLocalRandom.current().nextInt(newOrderLow, newOrderUp + 1); // in between

            System.out.println("numbers= " + newOrderLow + " " + newOrderUp + " " + newOrderMid);
            assertThat(newOrderLow).isBetween(50, shipCapacity / 3);
            assertThat(newOrderUp).isBetween(newOrderLow, shipCapacity + 1);
            assertThat(newOrderMid).isBetween(newOrderLow, newOrderUp + 1);
    }

我已经完成了这项工作，在我的机器上，您提到的规则似乎都没有被违反。

在我看来，问题出在其他地方，不在你提供的代码中，而是自己测试。

ThreadLocalRandom随机整数不在

1 个答案: