import java.nio.file.*;

 import java.nio.*;

 import java.nio.channels.ReadableByteChannel;

 import java.io.IOException;

 public class ReadPrimes {

   public static void main(String[] args) {

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

     if(!Files.exists(file)) {

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

       System.exit(1);

     }

     final int PRIMECOUNT = 6;

     final int LONG_BYTES = 8;                                          // Number of bytes for type long

     ByteBuffer buf = ByteBuffer.allocate(LONG_BYTES*PRIMECOUNT);

     long[] primes = new long[PRIMECOUNT];

     try (ReadableByteChannel inCh = Files.newByteChannel(file)){

       int primesRead = 0;

       while(inCh.read(buf) != -1) {

         LongBuffer longBuf = ((ByteBuffer)(buf.flip())).asLongBuffer();

         primesRead = longBuf.remaining();

         longBuf.get(primes, 0, primesRead);

         // List the primes read on the same line

         System.out.println();

         for(int i = 0 ; i < primesRead ; ++i) {

           System.out.printf("%10d", primes[i]);

         }

         buf.clear();                                                   // Clear the buffer for the next read

       }

       System.out.println("\nEOF reached.");

     } catch(IOException e) {

       e.printStackTrace();

     }

   }

 }