My IT teacher prefers to use a scanner to read a text file and then a loop with another scanner to read each line of the text file until the end of the file. This proves to have better data validation, error checking but is perhaps a bit longer in code and the Scanner class in Java is notorious from some strange errors. It also allows for delimeters and as far as I know it is easier in that respect to a read buffer.

Scanner scFile = new Scanner (new File("helloworld.txt")); //create the first scanner and use I/O class to open the file
while(scFile.hasNext())//run the loop to the end of the file
{
//use a scanner for a new line and also can have a delimeter string
  Scanner scLine = new Scanner (scFile.nextLine()).useDelimeter("#");
//From here you can use local variables or fields with the scLine.next() or .nextInt() ect... to save each line
//or variable from the file
//close scLine stream
  scLine.close();
}
//close the Scanner stream
scFile.close;