title: ScheduledExecutorService vs Timer vs Handler
body: <p>What are the pros and cons of using  <code>ScheduledExecutorService</code> / <code>Timer</code> / <code>Handler</code>? As I understand in Android instead of <code>Timer</code> it's need to use <code>Handler</code>, but what about <code>ScheduledExecutorService</code>?</p>
  
  <p>As I understand <code>Handler</code> and <code>ScheduledExecutorService</code> is only for relative time, right?</p>