WeekFields类的weekOfYear()方法用于返回一个字段，以基于此WeekFields访问一年中的星期。例：
如果一年的第一天是星期一，则第一周从第一天开始，没有零周
如果一年的第二天是星期一，则第一周从第二天开始，而第一天在零周
如果一年中的第4天是星期一，则第1周从第4周开始，第1至第3周在零周开始
如果一年中的第5天是星期一，则第二周从第5周开始，第1至第4周在第1周
该字段可用于任何日历系统。
用法:
public TemporalField weekOfYear()
参数：此方法不接受任何内容。
返回值：此方法返回一个提供对week-of-year的访问权限的字段，而不是null。
以下示例程序旨在说明WeekFields.weekOfYear()方法：
程序1:
// Java program to demonstrate
// WeekFields.weekOfYear() method
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalField;
import java.time.temporal.WeekFields;
public class GFG {
public static void main(String[] args)
{
// create WeekFields
WeekFields weekFields
= WeekFields.of(DayOfWeek.MONDAY, 1);
// apply weekOfYear()
TemporalField weekOfYear
= weekFields.weekOfYear();
// create a LocalDate
LocalDate day
= LocalDate.of(2021, 12, 21);
// get week of year for localdate
int wow = day.get(weekOfYear);
// print results
System.out.println("Week of year for "
+ day + ":" + wow);
}
}
输出：
Week of year for 2021-12-21:52
程序2:
// Java program to demonstrate
// WeekFields.weekOfYear() method
import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalField;
import java.time.temporal.WeekFields;
public class GFG {
public static void main(String[] args)
{
// create WeekFields
WeekFields weekFields
= WeekFields.of(DayOfWeek.SUNDAY, 1);
// apply weekOfYear()
TemporalField weekOfYear
= weekFields.weekOfYear();
// create a LocalDate
LocalDate day = LocalDate.of(2014, 10, 12);
// get week of year for localdate
int wow = day.get(weekOfYear);
// print results
System.out.println("Week of year for "
+ day + ":" + wow);
}
}
输出：
Week of year for 2014-10-12:42
参考：https：//docs.oracle.com/javase/10/docs/api/java/time/temporal/WeekFields.html#weekOfYear()
