private void createSuffixedOutput(String outFileName){
  String suffix=String.format(INTERVALLED_FORMAT,this.lastOutputSuffix);
  createOutput(outFileName + suffix);
  this.lastOutputSuffix++;
}

private void createSuffixedOutput ( String outFileName ) { String suffix = String . format ( INTERVALLED_FORMAT , this . lastOutputSuffix ) ; createOutput ( outFileName + suffix ) ; this . lastOutputSuffix ++ ; }
creates a number - suffixed output file with increasing number suffix
