问题描述
Random 类具有在给定范围内生成随机 int 的方法.例如:
Random class has a method to generate random int in a given range. For example:
Random r = new Random();
int x = r.nextInt(100);
这将生成一个大于或等于 0 且小于 100 的 int 数.我想对 long 数做同样的事情.
This would generate an int number more or equal to 0 and less than 100. I'd like to do exactly the same with long number.
long y = magicRandomLongGenerator(100);
Random 类只有 nextLong(),但它不允许设置范围.
Random class has only nextLong(), but it doesn't allow to set range.
推荐答案
从Java 7(或Android API Level 21 = 5.0+)开始你可以直接使用ThreadLocalRandom.current().nextLong(n)
(对于 0 ≤ x