I had a problem w/ efficiency - The problem was that using String concatenation was inefficient for large text files, when reading the whole file into the String. I've since thought about it, and I guess this is because Strings are immutable - so every time concatenation is done, a new String object has to be created and the underlying char array has to be copied? After some research, I came across StringBuilder and String___ (I forget the rest of the name of the class). My question is, how can a text file be read in as efficiently as possible? I don't really care what type its read into. Also, a lot of sources I found said StringBuilder was the best way, is that true?