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[add] add DateTimeExamples in Java 8 module.
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‎README.md

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* [ ] 容器类部分使用模块 java-container
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* [ ] IO 部分使用模块 java-io
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* [x] Java 虚拟机相关部分使用模块 java-jvm(2017.3.20 完成雏形)
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* [ ] Java 8 新特性使用模块 java8(正在进行)
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* [x] Java 8 新特性使用模块 java8(2017.3.29 完成)
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‎java8/README.md

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- BestPriceFinder: 添加折扣后的版本
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- BestPriceFinderMain: 测试每种实现方案的执行时间
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时间和日期
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- DateTimeExamples: 新的时间和日期 API 示例

‎java8/src/main/java/com/brianway/learning/java8/effective/time/DateTimeExamples.java

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package com.brianway.learning.java8.effective.time;
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import static java.time.temporal.TemporalAdjusters.lastDayOfMonth;
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import static java.time.temporal.TemporalAdjusters.nextOrSame;
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import java.text.DateFormat;
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import java.text.SimpleDateFormat;
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import java.time.DayOfWeek;
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import java.time.Duration;
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import java.time.Instant;
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import java.time.LocalDate;
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import java.time.LocalDateTime;
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import java.time.LocalTime;
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import java.time.Month;
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import java.time.chrono.JapaneseDate;
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import java.time.format.DateTimeFormatter;
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import java.time.format.DateTimeFormatterBuilder;
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import java.time.temporal.ChronoField;
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import java.time.temporal.ChronoUnit;
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import java.time.temporal.Temporal;
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import java.time.temporal.TemporalAdjuster;
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import java.util.Calendar;
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import java.util.Date;
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import java.util.Locale;
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/**
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* 新的时间和日期 API 示例
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*/
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public class DateTimeExamples {
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private static final ThreadLocal<DateFormat> formatters = new ThreadLocal<DateFormat>() {
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protected DateFormat initialValue() {
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return new SimpleDateFormat("dd-MMM-yyyy");
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}
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};
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public static void main(String[] args) {
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System.out.println("---------------useOldDate---------------------");
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useOldDate();
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System.out.println("---------------useLocalDate-----------------");
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useLocalDate();
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System.out.println("-------------useTemporalAdjuster---------------");
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useTemporalAdjuster();
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System.out.println("--------------useDateFormatter---------------");
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useDateFormatter();
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}
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private static void useOldDate() {
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Date date = new Date(114, 2, 18);
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System.out.println(date);
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System.out.println(formatters.get().format(date));
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Calendar calendar = Calendar.getInstance();
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calendar.set(2014, Calendar.FEBRUARY, 18);
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System.out.println(calendar);
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}
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private static void useLocalDate() {
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LocalDate date = LocalDate.of(2014, 3, 18);
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int year = date.getYear(); // 2014
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Month month = date.getMonth(); // MARCH
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int day = date.getDayOfMonth(); // 18
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DayOfWeek dow = date.getDayOfWeek(); // TUESDAY
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int len = date.lengthOfMonth(); // 31 (days in March)
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boolean leap = date.isLeapYear(); // false (not a leap year)
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System.out.println(date);
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int y = date.get(ChronoField.YEAR);
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int m = date.get(ChronoField.MONTH_OF_YEAR);
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int d = date.get(ChronoField.DAY_OF_MONTH);
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LocalTime time = LocalTime.of(13, 45, 20); // 13:45:20
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int hour = time.getHour(); // 13
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int minute = time.getMinute(); // 45
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int second = time.getSecond(); // 20
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System.out.println(time);
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LocalDateTime dt1 = LocalDateTime.of(2014, Month.MARCH, 18, 13, 45, 20); // 2014-03-18T13:45
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LocalDateTime dt2 = LocalDateTime.of(date, time);
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LocalDateTime dt3 = date.atTime(13, 45, 20);
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LocalDateTime dt4 = date.atTime(time);
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LocalDateTime dt5 = time.atDate(date);
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System.out.println(dt1);
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LocalDate date1 = dt1.toLocalDate();
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System.out.println(date1);
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LocalTime time1 = dt1.toLocalTime();
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System.out.println(time1);
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Instant instant = Instant.ofEpochSecond(44 * 365 * 86400);
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Instant now = Instant.now();
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Duration d1 = Duration.between(LocalTime.of(13, 45, 10), time);
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Duration d2 = Duration.between(instant, now);
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System.out.println(d1.getSeconds());
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System.out.println(d2.getSeconds());
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Duration threeMinutes = Duration.of(3, ChronoUnit.MINUTES);
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System.out.println(threeMinutes);
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JapaneseDate japaneseDate = JapaneseDate.from(date);
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System.out.println(japaneseDate);
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}
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private static void useTemporalAdjuster() {
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LocalDate date = LocalDate.of(2014, 3, 18);
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date = date.with(nextOrSame(DayOfWeek.SUNDAY));
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System.out.println(date);
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date = date.with(lastDayOfMonth());
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System.out.println(date);
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date = date.with(new NextWorkingDay());
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System.out.println(date);
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date = date.with(nextOrSame(DayOfWeek.FRIDAY));
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System.out.println(date);
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date = date.with(new NextWorkingDay());
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System.out.println(date);
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date = date.with(nextOrSame(DayOfWeek.FRIDAY));
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System.out.println(date);
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date = date.with(DateTimeExamples::nextWorkingDay);
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System.out.println(date);
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}
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private static class NextWorkingDay implements TemporalAdjuster {
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@Override
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public Temporal adjustInto(Temporal temporal) {
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return nextWorkingDay(temporal);
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}
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}
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private static Temporal nextWorkingDay(Temporal temporal) {
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DayOfWeek dow = DayOfWeek.of(temporal.get(ChronoField.DAY_OF_WEEK));
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int dayToAdd = 1;
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if (dow == DayOfWeek.FRIDAY) dayToAdd = 3;
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if (dow == DayOfWeek.SATURDAY) dayToAdd = 2;
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return temporal.plus(dayToAdd, ChronoUnit.DAYS);
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}
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private static void useDateFormatter() {
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LocalDate date = LocalDate.of(2014, 3, 18);
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DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");
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DateTimeFormatter italianFormatter = DateTimeFormatter.ofPattern("d. MMMM yyyy", Locale.ITALIAN);
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System.out.println(date.format(DateTimeFormatter.ISO_LOCAL_DATE));
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System.out.println(date.format(formatter));
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System.out.println(date.format(italianFormatter));
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DateTimeFormatter complexFormatter = new DateTimeFormatterBuilder()
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.appendText(ChronoField.DAY_OF_MONTH)
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.appendLiteral(". ")
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.appendText(ChronoField.MONTH_OF_YEAR)
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.appendLiteral(" ")
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.appendText(ChronoField.YEAR)
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.parseCaseInsensitive()
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.toFormatter(Locale.ITALIAN);
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System.out.println(date.format(complexFormatter));
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}
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}

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