java高效实现随机数的方法

具体的介绍请看:http://javamex.com/tutorials/random_numbers/xorshift.shtml

具体的代码如下:

private static int randomIntFrom0to(int max) {// XORShift instead of Math.random// http://javamex.com/tutorials/random_numbers/xorshift.shtmllong x = System.nanoTime();x ^= (x << 21);x ^= (x >>> 35);x ^= (x << 4);return Math.abs((int) x % max);}