Java8 时间格式化新方案

男娘i 2022-05-26 10:19 123阅读 0赞

import java.time.*;
    import java.time.format.DateTimeFormatter;
    import java.time.temporal.ChronoField;
    import java.time.temporal.ChronoUnit;
    import java.util.Formatter;
    
    import static java.time.temporal.TemporalAdjusters.lastDayOfMonth;
    import static java.time.temporal.TemporalAdjusters.nextOrSame;
    
    public class TimeDemo {
        public static void main(String[] args) {
            LocalDate date = LocalDate.of(2014,3,18);
            int year = date.getYear();
            Month month = date.getMonth();
            int day = date.getDayOfMonth();
            DayOfWeek dow = date.getDayOfWeek();
            int len = date.lengthOfMonth();
            boolean leap = date.isLeapYear();
    
            LocalDate today = LocalDate.now();
            LocalDateTime time = LocalDateTime.of(2018,4,12,12,12);
            System.out.println(time);
            System.out.println(date);
            System.out.println(year);
            System.out.println(month);
            System.out.println(day);
            System.out.println(dow);
            System.out.println(len);
            System.out.println(leap);
            System.out.println(today);
    
    
            //获取时长
            Period tenDays = Period.between(LocalDate.of(2014, 3, 8),
                    LocalDate.of(2014, 3, 18));
            System.out.println(tenDays.getDays());
            System.out.println(tenDays.getMonths());
    
            //Duration 和 Period对象
            Duration threeMinutes = Duration.ofMinutes(3);
            Duration threeMinutes2 = Duration.of(3, ChronoUnit.MINUTES);
            Period tenDays2 = Period.ofDays(10);
            Period threeWeeks = Period.ofWeeks(3);
            Period twoYearsSixMonthsOneDay = Period.of(2, 6, 1);
            System.out.println(threeMinutes.getSeconds());
            System.out.println(threeMinutes2.getSeconds());
            System.out.println(tenDays2.getDays());
            System.out.println(threeWeeks.getDays());
            System.out.println(twoYearsSixMonthsOneDay.getDays());
    
    
            //操纵、解析、格式化日期
            LocalDate date11 = LocalDate.of(2014, 3, 18);
            LocalDate date21 = date11.withYear(2011);
            LocalDate date31 = date21.withDayOfMonth(25);
            LocalDate date41 = date31.with(ChronoField.MONTH_OF_YEAR, 9);
    
            System.out.println(date11);
            System.out.println(date21);
            System.out.println(date31);
            System.out.println("---"+date41);
    
            //以相对方式修改LocalDate对象的属性
            LocalDate date12 = LocalDate.of(2014, 3, 18);
            LocalDate date22 = date12.plusWeeks(1);
            LocalDate date32 = date22.minusYears(3);
            LocalDate date42 = date32.plus(6, ChronoUnit.MONTHS);
    
            System.out.println(date12);
            System.out.println(date22);
            System.out.println(date32);
            System.out.println(date42);
    
            //使用 TemporalAdjuster
            LocalDate date13 = LocalDate.of(2014, 3, 18);
            LocalDate date23 = date13.with(nextOrSame(DayOfWeek.SUNDAY));
            LocalDate date33 = date13.with(lastDayOfMonth());
            System.out.println("----------");
            System.out.println(date13);
            System.out.println(date23);
            System.out.println(date33);
        }
    }