A Sample Program

• RandomAccessFile class stores binary data
• readInt and writeInt read/write integers as four-byte quantities
• readDouble and writeDouble use 8 bytes

  double x = f.readDouble();
  f.writeDouble(x);

• To find out how many bank accounts are in the file

  public int size() throws IOException
  {
     return (int) (file.length() / RECORD_SIZE); // RECORD_SIZE is 12 bytes:
                                                 // 4 bytes for the account number and
                                                 // 8 bytes for the balance
  }