jdk1.8 date新特性

package com.journaldev.java8.time; import java.time.LocalDate; import java.time.Month; import java.time.ZoneId; public class LocalDateExample { public static void main(String[] args) { 日期 //Current Date LocalDate today = LocalDate.now(); System.out.println("Current Date="+today); //Creating LocalDate by providing input arguments LocalDate firstDay_2014 = LocalDate.of(2014, Month.JANUARY, 1); System.out.println("Specific Date="+firstDay_2014); //Try creating date by providing invalid inputs //LocalDate feb29_2014 = LocalDate.of(2014, Month.FEBRUARY, 29); //Exception in thread "main" java.time.DateTimeException: //Invalid date 'February 29' as '2014' is not a leap year //Current date in "Asia/Kolkata", you can get it from ZoneId javadoc LocalDate todayKolkata = LocalDate.now(ZoneId.of("Asia/Kolkata")); System.out.println("Current Date in IST="+todayKolkata); //java.time.zone.ZoneRulesException: Unknown time-zone ID: IST //LocalDate todayIST = LocalDate.now(ZoneId.of("IST")); //Getting date from the base date i.e 01/01/1970 LocalDate dateFromBase = LocalDate.ofEpochDay(365); System.out.println("365th day from base date= "+dateFromBase); LocalDate hundredDay2014 = LocalDate.ofYearDay(2014, 100); System.out.println("100th day of 2014="+hundredDay2014); }

时间

         //Current Time          LocalTime time = LocalTime.now();          System.out.println( "Current Time=" +time);            //Creating LocalTime by providing input arguments          LocalTime specificTime = LocalTime.of( 12 , 20 , 25 , 40 );          System.out.println( "Specific Time of Day=" +specificTime);            //Try creating time by providing invalid inputs          //LocalTime invalidTime = LocalTime.of(25,20);          //Exception in thread "main" java.time.DateTimeException:          //Invalid value for HourOfDay (valid values 0 - 23): 25            //Current date in "Asia/Kolkata", you can get it from ZoneId javadoc          LocalTime timeKolkata = LocalTime.now(ZoneId.of( "Asia/Kolkata" ));          System.out.println( "Current Time in IST=" +timeKolkata);            //java.time.zone.ZoneRulesException: Unknown time-zone ID: IST          //LocalTime todayIST = LocalTime.now(ZoneId.of("IST"));            //Getting date from the base date i.e 01/01/1970          LocalTime specificSecondTime = LocalTime.ofSecondOfDay( 10000 );          System.out.println( "10000th second time= " +specificSecondTime); 日期时间//Current Date LocalDateTime today = LocalDateTime.now(); System.out.println("Current DateTime="+today); //Current Date using LocalDate and LocalTime today = LocalDateTime.of(LocalDate.now(), LocalTime.now()); System.out.println("Current DateTime="+today); //Creating LocalDateTime by providing input arguments LocalDateTime specificDate = LocalDateTime.of(2014, Month.JANUARY, 1, 10, 10, 30); System.out.println("Specific Date="+specificDate); //Try creating date by providing invalid inputs //LocalDateTime feb29_2014 = LocalDateTime.of(2014, Month.FEBRUARY, 28, 25,1,1); //Exception in thread "main" java.time.DateTimeException: //Invalid value for HourOfDay (valid values 0 - 23): 25 //Current date in "Asia/Kolkata", you can get it from ZoneId javadoc LocalDateTime todayKolkata = LocalDateTime.now(ZoneId.of("Asia/Kolkata")); System.out.println("Current Date in IST="+todayKolkata); //java.time.zone.ZoneRulesException: Unknown time-zone ID: IST //LocalDateTime todayIST = LocalDateTime.now(ZoneId.of("IST")); //Getting date from the base date i.e 01/01/1970 LocalDateTime dateFromBase = LocalDateTime.ofEpochSecond(10000, 0, ZoneOffset.UTC); System.out.println("10000th second time from 01/01/1970= "+dateFromBase);

}          //Current Time          LocalTime time = LocalTime.now();          System.out.println( "Current Time=" +time);            //Creating LocalTime by providing input arguments          LocalTime specificTime = LocalTime.of( 12 , 20 , 25 , 40 );          System.out.println( "Specific Time of Day=" +specificTime);            //Try creating time by providing invalid inputs          //LocalTime invalidTime = LocalTime.of(25,20);          //Exception in thread "main" java.time.DateTimeException:          //Invalid value for HourOfDay (valid values 0 - 23): 25            //Current date in "Asia/Kolkata", you can get it from ZoneId javadoc          LocalTime timeKolkata = LocalTime.now(ZoneId.of( "Asia/Kolkata" ));          System.out.println( "Current Time in IST=" +timeKolkata);            //java.time.zone.ZoneRulesException: Unknown time-zone ID: IST          //LocalTime todayIST = LocalTime.now(ZoneId.of("IST"));            //Getting date from the base date i.e 01/01/1970          LocalTime specificSecondTime = LocalTime.ofSecondOfDay( 10000 );          System.out.println( "10000th second time= " +specificSecondTime);