code: public static boolean notEquals(final Object object1, final Object object2) {
          return object1 != null && !object1.equals(object2) || object1 == null && object2 != null;
      }
docs: Return true if the object are NOT equals.<br />
  This method is NullPointerException-proof
  
  @param object1 first object to compare
  @param object2 second object to compare
  
  @return true if the object are NOT equals