Java DayOfWeek enum
在Java中，DayOfWeek是一个代表一周中7天的枚举。除了文本枚举名称外，每周的每一天都有一个int值。
Java DayOfWeek枚举声明
让我们看看java.time.DayOfWeek的声明。
public enum DayOfWeek extends Enum<
DayOfWeek>
implements TemporalAccessor, TemporalAdjuster
Java DayOfWeek的方法
| 方法 |
说明 |
| int get(TemporalField field) |
它用于获取一周中这一天中指定字段的值作为整数。 |
| boolean isSupported(TemporalField field) |
用于检查是否支持指定的字段。 |
| DayOfWeek minus(long days) |
它用于返回星期几，它是该日期之前指定的天数。 |
| DayOfWeek plus(long days) |
它用于返回星期几，该星期几是该天之后的指定天数。 |
| static DayOfWeek of(int dayOfWeek) |
用于从int值获取DayOfWeek的实例。 |
| static DayOfWeek[] values() |
用于按声明顺序返回包含此枚举类型的常量的数组。 |
Java DayOfWeek示例: get()
import java.time.*;
import java.time.temporal.ChronoField;
public class DayOfWeekExample1 {
public static void main(String[] args) {
LocalDate localDate = LocalDate.of(2017, Month.JANUARY, 25);
DayOfWeek dayOfWeek = DayOfWeek.from(localDate);
System.out.println(dayOfWeek.get(ChronoField.DAY_OF_WEEK));
}
}
输出:
Java DayOfWeek示例: of()
import java.time.DayOfWeek;
public class DayOfWeekExample2 {
public static void main(String[] args) {
DayOfWeek day = DayOfWeek.of(5);
System.out.println(day.name());
System.out.println(day.ordinal());
System.out.println(day.getValue());
}
}
输出:
Java DayOfWeek示例: plus()
import java.time.*;
public class DayOfWeekExample3 {
public static void main(String[] args) {
LocalDate date = LocalDate.of(2017, Month.JANUARY, 31);
DayOfWeek day = DayOfWeek.from(date);
System.out.println(day.getValue());
day = day.plus(3);
System.out.println(day.getValue());
}
}
输出:
Java DayOfWeek示例: minus()
import java.time.*;
public class DayOfWeekExample4 {
public static void main(String[] args) {
LocalDate date = LocalDate.of(2017, Month.JANUARY, 31);
DayOfWeek day = DayOfWeek.from(date);
System.out.println(day.getValue());
day = day.minus(3);
System.out.println(day.getValue());
}
}
输出:
