同事提醒我：不要踩到 LocalDateTime 的这个坑！

程序员文章站 2022-04-22 13:45:37

...

    public static void main(String[] args) {
        JDateTime dt = new JDateTime();
        System.out.println(dt.addDay(1));//原对象
        System.out.println(dt);

        LocalDateTime dc = LocalDateTime.now();
        System.out.println(dc.plusDays(1));//新对象
        System.out.println(dc);

        dc = dc.plusDays(1);
        System.out.println(dc);
    }

运行结果：

2019-12-24 18:43:25.283
2019-12-24 18:43:25.283

2019-12-24T18:43:25.364
2019-12-23T18:43:25.364

2019-12-24T18:43:25.364

dc.plusDays(1) 创建了新对象！！