如何不使用随机库等构建随机数？

Question

I have to generate random numbers in two different places in the project and I do it using the system clock, but I have to get different numbers in both. How can I do that?

Answer 1

You could use a loop surrounded by calls to System.nanoTime() , then use the least significant bits of their difference as random seed. Once you have, say, 128 bits you can use it as seed for a pseudo random number generator.

Answer 2

There is an article posted in the wiki at java-gaming.org about generating pseudo-random numbers that might be worth perusing. Pseudo-random number generators He shows what he calls an "Old School" method of creating them using a combination of polynomials and modular division. Plus links to other types of PRNGs.