title: what's the fastest way to scan a very large file in java?
body: <p>Imagine I have a very large text file. 
  Performance really matters.</p>
  
  <p>All I want to do is to scan it to look for a certain string.
  Maybe I want to count how many I have of those, but it really is not the point.</p>
  
  <p>The point is: what's the fastest way ? </p>
  
  <p>I don't care about maintainance it needs to be fast. </p>
  
  <p>Fast is key.</p>