Java8-07-ChronoUnit 日期枚举类

灰太狼 2022-02-28 13:06 142阅读 0赞

### 文章目录 ###

*  ChronoUnit
 *  入门例子
 *   *  plus() 测试
     *  between
 *  参考资料
 *  目录导航

# ChronoUnit #

一组标准的日期时间单位。

这组单元提供基于单元的访问来操纵日期，时间或日期时间。 可以通过实现TemporalUnit来扩展标准单元集。

这些单元适用于多个日历系统。

例如，大多数非ISO日历系统定义年，月和日的单位，只是略有不同的规则。 每个单元的文档说明了它的运作方式。

这是一个最终的、不可变的和线程安全的枚举。

# 入门例子 #

## plus() 测试 ##

@Test
    public void testChromoUnitsPlus() { 
        //Get the current date
        LocalDate today = LocalDate.now();
        System.out.println("Current date: " + today);
        //add 1 week to the current date
        LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS);
        System.out.println("Next week: " + nextWeek);
        //add 1 month to the current date
        LocalDate nextMonth = today.plus(1, ChronoUnit.MONTHS);
        System.out.println("Next month: " + nextMonth);
        //add 1 year to the current date
        LocalDate nextYear = today.plus(1, ChronoUnit.YEARS);
        System.out.println("Next year: " + nextYear);
        //add 10 years to the current date
        LocalDate nextDecade = today.plus(1, ChronoUnit.DECADES);
        System.out.println("Date after ten year: " + nextDecade);
    }

*  日志信息

Current date: 2019-02-27
    Next week: 2019-03-06
    Next month: 2019-03-27
    Next year: 2020-02-27
    Date after ten year: 2029-02-27

## between ##

@Test
    public void testChromoUnitsBetween() { 
        //Get the current date
        LocalDate today = LocalDate.now();
        LocalDate nextWeek = today.plus(1, ChronoUnit.WEEKS);
        long diff = ChronoUnit.WEEKS.between(today, nextWeek);
        Assert.assertEquals(1, diff);
    }

# 参考资料 #

[ChronoUnit][]

[http://www.sxt.cn/Java8-tutorial/java8\_chronounits.html][http_www.sxt.cn_Java8-tutorial_java8_chronounits.html]

[https://www.cnblogs.com/shihaiming/p/6371214.html][https_www.cnblogs.com_shihaiming_p_6371214.html]

# 目录导航 #

> [目录导航][Link 1]

[ChronoUnit]: https://docs.oracle.com/javase/8/docs/api/java/time/temporal/ChronoUnit.html
[http_www.sxt.cn_Java8-tutorial_java8_chronounits.html]: http://www.sxt.cn/Java8-tutorial/java8_chronounits.html
[https_www.cnblogs.com_shihaiming_p_6371214.html]: https://www.cnblogs.com/shihaiming/p/6371214.html
[Link 1]: http://blog.csdn.net/ryo1060732496/article/details/79424538