Speed boost and the ability to handle larger files without having a OutOfMemeoryError occurring (this is done by not compiling the string and writing each role to a FileOutputStream)

Comparison between straight FileOutputStream, RandomAccessFile and BufferedWriter:
FileOutputStream:     convertToTRole (1):   83,476 ms
BufferedWriter:           convertToTRole (1): 113,001 ms
RandomAccessFile: convertToTRole (1):   98,838 ms