Java 中的 WeekFields dayOfWeek()方法，带示例
原文:https://www . geesforgeks . org/weekfield-dayofweek-method-in-Java-with-examples/
周字段类的 dayOfWeek() 方法用于返回一个字段，根据该周字段访问一周中的某一天。例如，如果一周的第一天是星期一，那么它的值将为 1，而其他日期的范围从星期二为 2 到星期日为 7。
语法:
public TemporalField dayOfWeek()
参数:此方法不接受任何内容。
返回值:该方法返回一个字段，该字段提供对具有本地化编号的星期几的访问，而不是空值。
以下程序说明了 WeekFields.dayOfWeek()方法: 程序 1:
// Java program to demonstrate
// WeekFields.dayOfWeek() 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 dayOfWeek()
TemporalField dayOfWeek
= weekFields.dayOfWeek();
// create a LocalDate
LocalDate day = LocalDate.of(2021, 12, 21);
// get day of week for localdate
int dow = day.get(dayOfWeek);
// print results
System.out.println("day of week for "
+ day + " :" + dow);
}
}
Output:
day of week for 2021-12-21 :2
程序 2:
// Java program to demonstrate
// WeekFields.dayOfWeek() 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 dayOfWeek()
TemporalField dayOfWeek
= weekFields.dayOfWeek();
// create a LocalDate
LocalDate day
= LocalDate.of(2018, 05, 31);
// get day of week for localdate
int dow = day.get(dayOfWeek);
// print results
System.out.println("day of week for "
+ day + " :" + dow);
}
}
Output:
day of week for 2018-05-31 :5
参考文献:https://docs . Oracle . com/javase/10/docs/API/Java/time/temporal/weekfields . html # dayOfWeek()
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