java8 LocalDate LocalDateTime等时间类用法实例分析

package org.smarttechie;
import java.time.LocalDate;
import java.time.temporal.ChronoUnit;
/**
* This class demonstrates JAVA 8 data and time API
* @author Siva Prasad Rao Janapati
* */
public class DateTimeDemonstration {
/**
* @param args
*/
public static void main(String[] args) {
 //Create date
 LocalDate localDate = LocalDate.now();
 System.out.println("The local date is :: " + localDate);
 //Find the length of the month. That is, how many days are there for this month.
 System.out.println("The number of days available for this month:: " + localDate.lengthOfMonth());
 //Know the month name
 System.out.println("What is the month name? :: " + localDate.getMonth().name());
 //add 2 days to the today's date.
 System.out.println(localDate.plus(2, ChronoUnit.DAYS));
 //substract 2 days from today
 System.out.println(localDate.minus(2, ChronoUnit.DAYS));
 //Convert the string to date
 System.out.println(localDate.parse("2017-04-07"));
 }
}

import java.time.LocalTime;
import java.time.temporal.ChronoUnit;
/**
* This class demonstrates JAVA 8 data and time API
* @author Siva Prasad Rao Janapati
* */
public class DateTimeDemonstration {
/**
* @param args
*/
public static void main(String[] args) {
 //Get local time
 LocalTime localTime = LocalTime.now();
 System.out.println(localTime);
 //Get the hour of the day
 System.out.println("The hour of the day:: " + localTime.getHour());
 //add 2 hours to the time.
 System.out.println(localTime.plus(2, ChronoUnit.HOURS));
 //add 6 minutes to the time.
 System.out.println(localTime.plusMinutes(6));
 //substract 2 hours from current time
 System.out.println(localTime.minus(2, ChronoUnit.HOURS));
 }
}

import java.time.LocalDateTime;
import java.time.temporal.ChronoUnit;
/**
* This class demonstrates JAVA 8 data and time API
* @author Siva Prasad Rao Janapati
*
*/
public class DateTimeDemonstration {
/**
* @param args
*/
public static void main(String[] args) {
 //Get LocalDateTime object
 LocalDateTime localDateTime = LocalDateTime.now();
 System.out.println(localDateTime);
 //Find the length of month. That is, how many days are there for this month.
 System.out.println("The number of days available for this month:: " + localDateTime.getMonth().length(true));
 //Know the month name
 System.out.println("What is the month name? :: " + localDateTime.getMonth().name());
 //add 2 days to today's date.
 System.out.println(localDateTime.plus(2, ChronoUnit.DAYS));
 //substract 2 days from today
 System.out.println(localDateTime.minus(2, ChronoUnit.DAYS));
 }
}

import java.time.Year;
import java.time.temporal.ChronoUnit;
/**
* This class demonstrates JAVA 8 data and time API
* @author Siva Prasad Rao Janapati
*
*/
public class DateTimeDemonstration {
/**
* @param args
*/
public static void main(String[] args) {
 //Get year
 Year year = Year.now();
 System.out.println("Year ::" + year);
 //know the year is leap year or not
 System.out.println("Is year[" +year+"] leap year?"+ year.isLeap());
 }
}

import java.time.LocalDate;
import java.time.Period;
import java.time.temporal.ChronoUnit;
/**
* This class demonstrates JAVA 8 data and time API
* @author Siva Prasad Rao Janapati
*
*/
public class DateTimeDemonstration {
/**
* @param args
*/
public static void main(String[] args) {
 LocalDate localDate = LocalDate.now();
 Period period = Period.between(localDate, localDate.plus(2, ChronoUnit.DAYS));
 System.out.println(period.getDays());
 }
}