18. RandomAccessFile example: reading binary file

• Code that reads data from a file

  
      final int RECORD_LENGTH = 16;  // 4 chars @ 2 bytes per 
                                     // char +1 double @ 8
                                     // bytes
  
      RandomAccessFile booksFile =
          new RandomAccessFile("books.ran", "r");
  
      // move the pointer to the third record
      int recordNumber = 3;
      booksFile.seek((recordNumber - 1) * RECORD_LENGTH);
  
      // read the third record
      String code = "";
      for (int i = 0; i < 4; i++)
          code += booksFile.readChar();
      double price = booksFile.readDouble();
  
      booksFile.close();