code: public static <T> boolean equalsE(T a, T b) {
          if (a == null && b == null) {
              return true;
          }
          if (a != null && b == null) {
              return false;
          }
          if (a == null) {
              return false;
          }
          return a.equals(b);
      }
docs: Equals with null checking
  
  @param a first argument
  @param b second argument
  @return is equals result