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原文网址:Java时间系列(JDK8)–Period的使用_IT利刃出鞘的博客-CSDN博客
简介
本文用示例介绍java的Period的用法。
Duration和Period
说明
Duration类通过年月日时分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(秒0纳秒)、1毫秒(0秒纳秒)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
见:Java–Duration–使用/实例_IT利刃出鞘的博客-CSDN博客
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.
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
LocalDate startDate = LocalDate.of(2015, 2, 20); LocalDate endDate = LocalDate.of(2017, 1, 15); // startDate减endDate Period 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。
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
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
period.getYears(); period.getMonths(); period.getDays();
比较方法
上边是文章的部分内容,为便于维护,全文已转移到此网址:Java时间系列(JDK8)-Period的使用 – 自学精灵
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