java8中新的Date和Time詳解。本站提示廣大學習愛好者：（java8中新的Date和Time詳解）文章只能為提供參考，不一定能成為您想要的結果。以下是java8中新的Date和Time詳解正文
新Date類和Time類面前的設計准繩：
弗成變類
java8之前，Date類都是可變類。當我們在多線程情況下應用它，編程人員應當確認Date對象的線程平安。Java8的Date和Time API供給了線程平安的弗成變類。編程人員不消斟酌並發的成績。
范疇模子驅動設計辦法
新的日期和時光的種別遵守“域驅動設計”。關於開辟者來講，懂得辦法和類的功效是很輕易的。
接上去讓我們來看看新Date和Time API:
1.java.time.LocalDate:
LocalDate只供給日期不供給時光信息。它是弗成變類且線程平安的。
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"));
}
}
2.java.time.LocalTime:
LocalTime只供給時光而不供給日期信息，它是弗成變類且線程平安的。
package org.smarttechie;
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));
}
}
3.java.time.LocalDateTime:
LocalDateTime供給時光和日期的信息，它是弗成變類且線程平安的
package orr.smarttechie;
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));
}
}
4.java.time.Year:
Year供給年的信息，它是弗成變類且線程平安的。
package orr.smarttechie;
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());
}
}
5.java.time.Duration:
Duration是用來盤算兩個給定的日期之間包括若干秒，若干毫秒，它是弗成變類且線程平安的
6.java.time.Period:
Period是用來盤算兩個給定的日期之間包括若干天，若干月或許若干年，它是弗成變類且線程平安的
package orr.smarttechie;
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());
}
}
