Java ByteBuffer allocation automatically zeroes the ByteBuffer

import java.nio.ByteBuffer;

public class Main {
   private static final int BSIZE = 1024;

   public static void main(String[] args) {
      ByteBuffer bb = ByteBuffer.allocate(BSIZE);

      int i = 0;/*  w ww  . ja  v a  2s .  co  m*/
      while (i++ < bb.limit()) {
         if (bb.get() != 0) {
            System.out.println("nonzero");
         }
      }
      System.out.println("i = " + i);

   }
}