public int copy(byte[] bytes,int at){
  System.arraycopy(this.bytes,0,bytes,at,this.length);
  return at + this.length;
}

public int copy ( byte [ ] bytes , int at ) { System . arraycopy ( this . bytes , 0 , bytes , at , this . length ) ; return at + this . length ; }
copy the contents of this kim to a byte array .
