Do Java system milliseconds take account of leap seconds?

Question

The java function System.currentTimeMillis() apparently returns the number of seconds since 1st January 1970. However, according to wikipedia.org/wiki/Leap_second,

Answer 1

POSIX requires that the system clock not admit the existence of leap seconds. MS Windows cannot guarantee the quality (nor existence) of the system clock hardware, and it has eschewed guarantee of 1-second accuracy. Java cannot easily do anything that the underlying system refuses to do. The operating systems are hamstrung by the history of the international regulations that result in one IEEE standard (PTP) that requires leap seconds and another (POSIX) that denies them.