title: read whole file in a folder
body: <p>Is there a way in Java where I can specify a directory in java and it reads the whole file one by one?</p>
  
  <p>Otherwise is there a way to do a regex file read in java? So if all the files in the folder all starts with gh001_12312 gh002_12312, gh003_12911, gh004_22222, gh005_xxxxx, etc</p>