### Question:
Result { T orElse(T other) { return isPresent() ? value : other; } private  Result(T value, E err); static Result<T, E> of(T value); static Result<T, E> error(E err); T get(); E getErr(); @Override boolean equals(Object obj); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void testOrElse() { Integer valueRes = Result.of(42).orElse(24); assertThat("valueRes get result value", valueRes, is(42)); Integer errorRes = Result.<Integer, Integer>error(42).orElse(24); assertThat("errorRes get else value", errorRes, is(24)); }