UUIDGen.java 文件源码

private static long makeClockSeqAndNode()
{
    long clock = new SecureRandom().nextLong();

    long lsb = 0;
    lsb |= 0x8000000000000000L;                 // variant (2 bits)
    lsb |= (clock & 0x0000000000003FFFL) << 48; // clock sequence (14 bits)
    lsb |= makeNode();                          // 6 bytes
    return lsb;
}