public T orElseThrow() {
		return orElseThrow(NoSuchElementException::new, "No value present");
	}
@Test
	public void orElseThrowTest() {
		assertThrows(NoSuchElementException.class, () -> {
			// 获取一个不可能为空的值，否则抛出NoSuchElementException异常
			Object obj = Opt.ofNullable(null).orElseThrow();
			assertNull(obj);
		});
	}