ObjectUtil { public static int hashCode(Object... objects) { return Arrays.hashCode(objects); }  static boolean equals(@Nullable Object a, @Nullable Object b); static int hashCode(Object... objects); static String toPrettyString(Object value);  }
@Test public void hashCodeTest() { assertThat(ObjectUtil.hashCode("a", "b") - ObjectUtil.hashCode("a", "a")).isEqualTo(1); }