Java时间转换小技巧

最新推荐文章于 2023-12-15 15:20:29 发布

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最新推荐文章于 2023-12-15 15:20:29 发布

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分类专栏： Java 文章标签： java

本文链接：https://blog.youkuaiyun.com/baifanwudi/article/details/104799211

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SimpleDateFormat有多线程问题，尽量使用DateTimeFormatter

当前时间加+1，返回结果是2020-03-12；

        LocalDate localDate = LocalDate.now();
        localDate = localDate.plusDays(1);
        System.out.println(localDate);

时间格式转换，返回结果2020-03-12 16:16:01；

        LocalDateTime localDateTime = LocalDateTime.now();
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        String a = localDateTime.format(dateTimeFormatter);
        System.out.println(a);

str转LocalDate

  		public static final DateTimeFormatter TIME_FORMAT_YYYY_MM_DD = DateTimeFormatter.ofPattern(TIME_PATTERN_YYYY_MM_DD);
   .....
        String subDate="2019-09-15";
        LocalDate localDate=LocalDate.parse(subDate,TIME_FORMAT_YYYY_MM_DD);
        System.out.println(localDate);

时间比较

        LocalDate localDate1=LocalDate.parse("2019-09-17",TIME_FORMAT_YYYY_MM_DD);
        LocalDate localDate2=LocalDate.parse("2019-09-16",TIME_FORMAT_YYYY_MM_DD);
        System.out.println(localDate1.compareTo(localDate2));

LocalDate转TIMESTAMP

        LocalDate localDate = LocalDate.now();
        System.out.println(localDate);
        long timestamp = localDate.atStartOfDay(ZoneId.systemDefault()).toInstant().toEpochMilli();
        System.out.println(timestamp);

排序小技巧

List<TrainCityChooseBO> trainCityChooseBOList = new ArrayList<>();
Collections.sort(trainCityChooseBOList, Comparator.comparingInt(TrainCityChooseBO::getCityNum).reversed());