Java Month枚举

本文概述

• Java Month枚举声明
• Java Month枚举示例
• Java Month枚举示例：getValue()
• Java Month枚举示例：minus()
• Java Month枚举示例：plus()
• Java Month枚举示例：length()

在Java中, Month是一个枚举, 代表一年中的12个月。除文本枚举名称外, 每年的每个月都有一个int值。

Java Month枚举声明

我们来看一下java.time.Month的声明。

public enum Month extends Enum<Month> implements TemporalAccessor, TemporalAdjuster

Java月的方法

Java Month枚举示例

import java.time.*;
import java.time.temporal.*;
public class MonthEnumExample1 {
    public static void main(String[] args) {
        Month month = Month.valueOf("January".toUpperCase());
        System.out.printf("For the month of %s all Sunday are:%n", month);
        LocalDate localdate = Year.now().atMonth(month).atDay(1).
        with(TemporalAdjusters.firstInMonth(DayOfWeek.SUNDAY));
        Month mi = localdate.getMonth();
        while (mi == month) {
            System.out.printf("%s%n", localdate);
            localdate = localdate.with(TemporalAdjusters.next(DayOfWeek.SUNDAY));
            mi = localdate.getMonth();
        }
    }
}

立即测试

输出：

For the month of JANUARY all Sunday are:
2017-01-01
2017-01-08
2017-01-15
2017-01-22
2017-01-29

Java Month枚举示例：getValue()

import java.time.*;
public class MonthEnumExample2 {
  public static void main(String[] args) {
    Month month = Month.from(LocalDate.now());
    System.out.println(month.getValue());
    System.out.println(month.name());
  }
}

立即测试

输出：

1
JANUARY

Java Month枚举示例：minus()

import java.time.*;
public class MonthEnumExample3 {
  public static void main(String[] args) {
    Month month = Month.from(LocalDate.now());  
    System.out.println(month.minus(2));
  }
}

立即测试

输出：

NOVEMBER

Java Month枚举示例：plus()

import java.time.*;
public class MonthEnumExample4 {
  public static void main(String[] args) {
    Month month = Month.from(LocalDate.now());  
    System.out.println(month.plus(2));
  }
}

立即测试

输出：

MARCH

Java Month枚举示例：length()

import java.time.*;
public class MonthEnumExample5 {
  public static void main(String[] args) {
    Month month = Month.from(LocalDate.now());  
    System.out.println("Total Number of days: "+month.length(true));
  }
}

立即测试

输出：

Total Number of days: 31