简介
本文用示例介绍java的Period的用法。
Duration和Period
说明
Duration类通过秒和纳秒相结合来描述一个时间量，最高精度是纳秒。时间量可以为正也可以为负，比如1天（86400秒0纳秒）、-1天（-86400秒0纳秒）、1年（31556952秒0纳秒）、1毫秒（0秒1000000纳秒）等。
Period类通过年、月、日相结合来描述一个时间量，最高精度是天。时间量可以为正也可以为负，例如2年（2年0个月0天）、3个月（0年3个月0天）、4天（0年0月4天）等。
这两个类是不可变的、线程安全的、最终类。都是JDK8新增的。
Duration用法
创建方法
通过时间单位创建
如果仅一个值表示，如使用ofDays()方法，那么其他值为0。
若仅用ofWeeks，则其天数为week数乘以7.
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Period fromUnits = Period.of(3, 10, 10);Period fromDays = Period.ofDays(50);Period fromMonths = Period.ofMonths(5);Period fromYears = Period.ofYears(10);Period fromWeeks = Period.ofWeeks(40); //280天 |
通过LocalDate创建
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LocalDate startDate = LocalDate.of(2015, 2, 20);LocalDate endDate = LocalDate.of(2017, 1, 15);// startDate减endDatePeriod period = Period.between(startDate, endDate); |
解析方法
格式1：“PnYnMnWnD”
P：开始符，表示period（即：表示年月日）；
Y：year；
M：month；
W：week；
D：day
P, Y, M, W, D都可以用大写或者小写。
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Period period = Period.parse("P2Y"); //2年Period period = Period.parse("P2Y3M5D"); //2年3月5天Period period = Period.parse("P1Y2M3W4D"); // 1年2月3周4天。即：1年2月25天 |
源码
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public final class Period implements ChronoPeriod, Serializable { //----------------------------------------------------------------------- /** * Obtains a {@code Period} from a text string such as {@code PnYnMnD}. * <p> * This will parse the string produced by {@code toString()} which is * based on the ISO-8601 period formats {@code PnYnMnD} and {@code PnW}. * <p> * The string starts with an optional sign, denoted by the ASCII negative * or positive symbol. If negative, the whole period is negated. * The ASCII letter "P" is next in upper or lower case. * There are then four sections, each consisting of a number and a suffix. * At least one of the four sections must be present. * The sections have suffixes in ASCII of "Y", "M", "W" and "D" for * years, months, weeks and days, accepted in upper or lower case. * The suffixes must occur in order. * The number part of each section must consist of ASCII digits. * The number may be prefixed by the ASCII negative or positive symbol. * The number must parse to an {@code int}. * <p> * The leading plus/minus sign, and negative values for other units are * not part of the ISO-8601 standard. In addition, ISO-8601 does not * permit mixing between the {@code PnYnMnD} and {@code PnW} formats. * Any week-based input is multiplied by 7 and treated as a number of days. * <p> * For example, the following are valid inputs: * <pre> * "P2Y" -- Period.ofYears(2) * "P3M" -- Period.ofMonths(3) * "P4W" -- Period.ofWeeks(4) * "P5D" -- Period.ofDays(5) * "P1Y2M3D" -- Period.of(1, 2, 3) * "P1Y2M3W4D" -- Period.of(1, 2, 25) * "P-1Y2M" -- Period.of(-1, 2, 0) * "-P1Y2M" -- Period.of(-1, -2, 0) * </pre> * * @param text the text to parse, not null * @return the parsed period, not null * @throws DateTimeParseException if the text cannot be parsed to a period */ public static Period parse(CharSequence text) { // 其他代码 } // 其他代码} |
获得年月日
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period.getYears();period.getMonths();period.getDays(); |
比较方法
用between来比较日期。
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LocalDate startDate = LocalDate.of(2015, 2, 20);LocalDate endDate = LocalDate.of(2017, 1, 15);// startDate减endDatePeriod period = Period.between(startDate, endDate);// 任何一个时间单元为负数，则返回true。true：endDate早于startDateperiod.isNegative() |
增减方法
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Period period = Period.parse("P2Y3M5D");period.plusDays(50);period.minusMonths(2); |
转换单位
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Period period = Period.parse("P1Y2M3D");period.toTotalMonths(); // 14 |
取值方法
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Period period = Period.parse("P1Y2M3D");period.getYears(); // 1period.getMonths(); // 2period.getDays(); // 3 |
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原文链接：https://knife.blog.csdn.net/article/details/122772818
