7. FileChannel example: writing one random record

• 
  // 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.*;
  public class CreateOneRandomAccessRecord
  {
      public static void main(String[] args)
      {
          Path file =
              Paths.get("C:\\example\\RandomEmployees.txt");
          String s = "002,Janitor,12.25" +
              System.getProperty("line.separator");
          final int RECSIZE = s.length();
          byte[] data = s.getBytes();
          ByteBuffer buffer = ByteBuffer.wrap(data);
          FileChannel fc = null;
          try
          {
              fc = (FileChannel)Files.newByteChannel(file, READ, WRITE);
              fc.position(2 * RECSIZE);
              fc.write(buffer);
              fc.close();
          }
          catch (Exception e)
          {
              System.out.println("Error message: " + e);
          }
      }
  }//class CreateOneRandomAccessRecord