Java DoubleBuffer convert from ByteBuffer

import java.nio.ByteBuffer;
import java.nio.DoubleBuffer;

public class Main {
   public static void main(String[] args) {
      ByteBuffer bb = ByteBuffer.wrap(new byte[] { 0, 0, 0, 0, 0, 0, 0, 'a' });
      bb.rewind();/*  w w  w  .j a v a2s. c  o m*/
      System.out.println("Byte Buffer");
      while (bb.hasRemaining())
         System.out.println(bb.position() + " -> " + bb.get());

      DoubleBuffer db = ((ByteBuffer) bb.rewind()).asDoubleBuffer();
      System.out.println("Double Buffer");
      while (db.hasRemaining())
         System.out.println(db.position() + " -> " + db.get());
   }
}