public SeatInfo() { File file = new File(".", "data"); file.mkdir(); File f = new File(file, "SeatInfo.txt"); try { raf = new RandomAccessFile(f, "rw"); if (raf.length() == 0) { raf.setLength(31 * 4 * FLIGHT_PER_DAY); for (int i = 0; i < 31 * FLIGHT_PER_DAY; i++) raf.writeInt(0); } } catch (Exception e) { e.printStackTrace(); } }