8. FileChannel example: writing multiple random records

• 
  // Get record data from the user
  // Store record at a specific location in a file
  import java.nio.file.*;
  import java.io.*;
  import java.nio.channels.FileChannel;
  import java.nio.ByteBuffer;
  import static java.nio.file.StandardOpenOption.*;
  import java.util.Scanner;
  public class CreateEmployeesRandomFile
  {
      public static void main(String[] args)
      {
          Scanner input = new Scanner(System.in);
          Path file =
              Paths.get("C:\\example\\RandomEmployees.txt");
          String s = "000, ,00.00" +
              System.getProperty("line.separator");
          final int RECSIZE = s.length();
          FileChannel fc = null;
          String delimiter = ",";
          String idString;
          int id;
          String name;
          String payRate;
          final String QUIT = "999";
          try
          {
              fc = (FileChannel)Files.newByteChannel(file, READ, WRITE);
              System.out.print("Enter employee ID number >> ");
              idString = input.nextLine();
              while(!(idString.equals(QUIT)))
              {
                  id = Integer.parseInt(idString);
                  System.out.print("Enter name for employee #" +
                      id + " >> ");
                  name = input.nextLine();
                  System.out.print("Enter pay rate >> ");
                  payRate = input.nextLine();
                  s = idString + delimiter + name + delimiter +
                      payRate + System.getProperty("line.separator");
                  byte[] data = s.getBytes();
                  ByteBuffer buffer = ByteBuffer.wrap(data);
  
                  // The records are stored pre-sorted based on the specified ID:
                  fc.position(id * RECSIZE);
                  fc.write(buffer);
                  System.out.print("Enter next ID number or " +
                      QUIT + " to quit >> ");
                  idString = input.nextLine();
              }
              fc.close();
          }
          catch (Exception e)
          {
              System.out.println("Error message: " + e);
          }
      }
  }//class CreateEmployeesRandomFile