code: public static Long[] toReferenceType(long[] primArr) {
  	Long[] refArr = new Long[primArr.length];
  	for (int i = 0; i < primArr.length; i++)
  	    refArr[i] = Long.valueOf(primArr[i]);
  	return refArr;
      }
docs: convert a primitive array (value type) to Object Array (reference type).
  
  @param primArr value type Array
  @return reference type Array