Are non-synchronised static methods thread safe if they don't modify static class variables?

Question

I was wondering if you have a static method that is not synchronised, but does not modify any static variables is it thread-safe? What abou

Answer 1

Use the static keyword with synchronized static methods to modify static data shared among threads. With the static keyword all the threads created will contend for a single version of the method.

Use the volatile keyword along with synchronized instance methods will guarantee that each thread has its own copy of the shared data and no read/ writes will leak out between threads.