Java DayOfWeek枚举 _JavaDayOfWeek枚举

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	描述
int get(TemporalField field)	它用于从一周中的这一天中以整数形式获取指定字段的值。
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, 该星期几是该天之前的指定天数。
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)	它用于从int值获取DayOfWeek的实例。
static DayOfWeek[] values()	它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)); } }

立即测试
输出：

3

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()); } }

立即测试
【Java DayOfWeek枚举】输出：

FRIDAY 4 5

Java DayOfWeek示例：加号()

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()); } }

立即测试
输出：

2 5

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()); } }

立即测试
输出：