Java 8 Time API 示例: MonthDay、Month、OffsetDateTime和OffsetTime

MonthDay, Month, OffsetDateTime 和 OffsetTime 已经引入 Java 8 在 time API 中。MONTHDAY代表了月份和日期的组合。Month 是存储月份的所有字段的枚举。 OffsetDateTime表示带偏移的日期和时间，OffsetTime表示时间偏置。

java.time.MonthDay

MonthDay represents the combination of the month and day. This class does not provide year. In the example I am showing some uses and working of MonthDay.
MonthDayDemo.java

package com.cp.time;  import java.time.MonthDay;  public class MonthDayDemo {   public static void main(String[] args) {    MonthDay mday = MonthDay.now();    System.out.println(mday.getDayOfMonth());    System.out.println(mday.getMonth());    System.out.println(mday.atYear(2014));   }  } 

Find the output.Output

11  SEPTEMBER  2014-09-11 

java.time.Month

Month is an enum and represents the complete months of the year. Find the uses of Month enum.
MonthDemo.java

package com.cp.time;  import java.time.Month;  public class MonthDemo {   public static void main(String[] args) {    System.out.println(Month.MARCH);    System.out.println(Month.MARCH.getValue());    System.out.println(Month.of(3));    System.out.println(Month.valueOf("MARCH"));   }  } 

Find the output.Output

MARCH  3  MARCH  MARCH 

java.time.OffsetDateTime

OffsetDateTime represents all date and time fields. This class represents date and time with an offset. Find the uses of the OffsetDateTime.
OffsetDateTimeDemo.java

package com.cp.time;  import java.time.OffsetDateTime;  public class OffsetDateTimeDemo {   public static void main(String[] args) {    OffsetDateTime offsetDT = OffsetDateTime.now();    System.out.println(offsetDT.getDayOfMonth());    System.out.println(offsetDT.getDayOfYear());    System.out.println(offsetDT.getDayOfWeek());    System.out.println(offsetDT.toLocalDate());   }  } 

Find the output.Output

11  254  THURSDAY  2014-09-11 

java.time.OffsetTime

OffsetTime represents time with an offset that can be viewed as hour-minute-second-offset. Find the use of OffsetTime.
OffsetTimeDemo.java

package com.cp.time;  import java.time.OffsetTime;  public class OffsetTimeDemo {   public static void main(String[] args) {     OffsetTime offTime = OffsetTime.now();     System.out.println(offTime.getHour() +" hour");     System.out.println(offTime.getMinute() +" minute");     System.out.println(offTime.getSecond() +" second");   }  } 

Find the outputOutput

16 hour  39 minute  24 second