ZonedDateTime类的withDayOfYear()方法用于更改此ZonedDateTime中的day-of-year,并在此操作后返回ZonedDateTime的副本。此方法在本地时间线上操作,更改本地日期时间的day-of-year,并在此操作后更改本地日期时间使用区域ID获取偏移量,将其转换回ZonedDateTime。当转换回ZonedDateTime时,如果本地日期时间重叠,则将尽可能保留偏移量,否则将使用较早的偏移量。此实例是不可变的,不受此方法调用的影响。
用法:
public ZonedDateTime withDayOfYear(int dayOfYear)
参数:此方法接受单个参数dayOfYear,该参数表示要在结果中设置的day-of-year,范围为1至365-366。
返回值:此方法基于此日期时间和所请求的日期返回ZonedDateTime。
异常:如果day-of-year值无效,或者day-of-year对于year-year无效,则此方法引发DateTimeException。
以下示例程序旨在说明withDayOfYear()方法:
示例1:
// Java program to demonstrate
// ZonedDateTime.withDayOfYear() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a ZonedDateTime object
ZonedDateTime zoneddatetime
= ZonedDateTime.parse(
"2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");
// print instance
System.out.println("ZonedDateTime before"
+ " alter dayOfYear: "
+ zoneddatetime);
// alter dayOfYear to 200th day
ZonedDateTime returnvalue
= zoneddatetime.withDayOfYear(200);
// print result
System.out.println("ZonedDateTime after "
+ "alter dayOfYear: "
+ returnvalue);
}
}
ZonedDateTime before alter dayOfYear: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
ZonedDateTime after alter dayOfYear: 2018-07-19T19:21:12.123+05:30[Asia/Calcutta]
示例2:
// Java program to demonstrate
// ZonedDateTime.withDayOfYear() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a ZonedDateTime object
ZonedDateTime zoneddatetime
= ZonedDateTime.parse(
"2018-10-25T23:12:31.123+02:00[Europe/Paris]");
// print instance
System.out.println("ZonedDateTime before"
+ " alter dayOfYear: "
+ zoneddatetime);
// alter dayOfYear to 365
ZonedDateTime returnvalue
= zoneddatetime.withDayOfYear(365);
// print result
System.out.println("ZonedDateTime after "
+ "alter dayOfYear: "
+ returnvalue);
}
}
ZonedDateTime before alter dayOfYear: 2018-10-25T23:12:31.123+02:00[Europe/Paris]
ZonedDateTime after alter dayOfYear: 2018-12-31T23:12:31.123+01:00[Europe/Paris]
参考: https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html#withDayOfYear(int)
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