Java 中 WeekFields weekOfYear()方法，带示例
原文:https://www . geesforgeks . org/weekfields-week of year-in-Java-method-with-examples/
WeekFields 类的 weekOfYear() 方法用于返回一个字段，根据该 WeekFields 访问一年中的某一周。 例:
- 如果一年中的第一天是星期一，那么第一周从第一天开始，没有零周
- 如果一年中的第二天是星期一，第一周从第二天开始，第一天是第零周
- 如果一年中的第四天是星期一，那么第一周从第四天开始，第一到第三天是第零周
- 如果一年中的第五天是星期一，那么第二周从 5 日开始，第一到第四周是第一周
此字段可用于任何日历系统。
语法:
public TemporalField weekOfYear()
参数:此方法不接受任何内容。
返回值:该方法返回一个提供一年中某周访问权限的字段，不为空。
下面的程序说明了 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);
}
}
Output:
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);
}
}
Output:
Week of year for 2014-10-12 :42
参考文献:https://docs . Oracle . com/javase/10/docs/API/Java/time/temporal/weekfields . html # weekOfYear()
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