title: In Java, what is the fastest way to get the system time?
body: <p>I'm developing a system that often use the system time because the <code>Delayed</code> interface.</p>
  
  <p>What is fastet way to get the time from system?</p>
  
  <p>Currently I'm using <code>Calendar.getInstance().getTimeInMillis()</code> every time I need to get the time, but I don't know if there is a faster way.</p>