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

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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 
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