RandomAccessFile

• You can open a file either for
  • Reading only ("r")
  • Reading and writing ("rw")

   RandomAccessFile f = new RandomAcessFile("bank.dat","rw");

• To move the file pointer to a specific byte

   f.seek(n);

• To get the current position of the file pointer.

   long n = f.getFilePointer();  // of type "long" because files can be very large

• To find the number of bytes in a file

   long fileLength = f.length();