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()); } }