import java.nio.file.*;

 import java.nio.*;

 import java.io.*;

 public class StreamInputFromFile {

   public static void main(String[] args) {

     Path file = Paths.get(System.getProperty("user.home")).resolve("Beginning Java Struff").resolve("fibonnaci.bin");

     if(!Files.exists(file)) {

       System.out.println(file + " does not exist. Terminating program.");

       System.exit(1);

     }

     final int count = 6;                                               // Number of values to be read each time

     // Buffer to hold count values

     ByteBuffer buf = ByteBuffer.allocate(8*count);

     LongBuffer values = buf.asLongBuffer();

     byte[] bytes = buf.array();                                        // Backing array for buf

     int totalRead = 0;                                                 // Total value read

     try(BufferedInputStream fileIn = new BufferedInputStream(Files.newInputStream(file))){

       int numberRead = 0;

       while(true) {

         numberRead = fileIn.read(bytes, 0, bytes.length);

         if(numberRead == -1)                                           // EOF reached

           break;

         totalRead += numberRead/8;                                     // Increment total

         for(int i = 0 ; i < numberRead/8 ; ++i)                        // Access as many as there are

           System.out.format("%12d", values.get());

         System.out.println();                                          // New line

         values.flip();                                                 // Reset for next input

       }

     System.out.format("%d  values read.%n", totalRead);

     } catch(IOException e) {

       System.err.println("Error writing file: " + file);

       e.printStackTrace();

     }

   }

 }