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

MonthDay, Month, OffsetDateTime 和 OffsetTime 已經引入 Java 8 在 time API 中。MONTHDAY代表了月份和日期的組合。Month 是存儲月份的所有字段的枚舉。 OffsetDateTime表示帶偏移的日期和時間，OffsetTime表示時間偏置。

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