Java Month adjustInto()用法及代码示例

java.time.Month ENUM的adjustInto()方法是Java中的内置函数，该函数接受一个Temporal对象，该对象指定一个日期，并返回与输入相同的可观察类型的新Temporal对象，并用此month-of-year替换为月份。

方法声明：

public Temporal adjustInto(Temporal temporal)

用法：

Temporal newLocalDate = Month.ANYMONTH.adjustInto(Temporal temporal)

参数：此方法以时间为参数，其中：

temporal–是要调整的指定日期。
ANYMONTH–是要调整日期的指定月份，例如1月，2月等。
newLocalDate–是修改日期。

返回值：该函数返回调整后的Temporal对象，该对象是根据指定的Month调整的日期。

异常：

DateTimeException：如果无法进行调整，则此方法将引发此异常。
ArithmeticException注意：如果发生数字溢出，则抛出此异常。

以下示例程序旨在说明上述方法：

程序1：

import java.time.*; 
import java.time.Month; 
import java.time.temporal.Temporal; 
  
class DayOfWeekExample { 
    public static void main(String[] args) 
    { 
        // Set a Local Date whose month is found 
        LocalDate localDate1 
            = LocalDate.of(1947, Month.AUGUST, 15); 
  
        // Find the month from the Local Date 
        Month monthOfYear1 
            = Month.from(localDate1); 
  
        // Printing the Local Date 
        System.out.println(localDate1 
                           + " which is "
                           + monthOfYear1.name()); 
  
        // Adjust the month to JANUARY from AUGUST 
        Temporal localDate2 
            = Month.JANUARY 
                  .adjustInto(localDate1); 
  
        // Find the day from the new Local date 
        Month monthOfYear2 
            = Month.from(localDate2); 
  
        // Printing the new Local Date 
        System.out.println(localDate2 
                           + " which is "
                           + monthOfYear2.name()); 
    } 
}

输出：

1947-08-15 which is AUGUST
1947-01-15 which is JANUARY

程序2：

import java.time.*; 
import java.time.Month; 
import java.time.temporal.Temporal; 
  
class DayOfWeekExample { 
    public static void main(String[] args) 
    { 
        // Set a Local Date whose month is found 
        LocalDate localDate1 
            = LocalDate.of(2019, Month.MARCH, 18); 
  
        // Find the month from the Local Date 
        Month monthOfYear1 
            = Month.from(localDate1); 
  
        // Printing the Local Date 
        System.out.println(localDate1 
                           + " which is "
                           + monthOfYear1.name()); 
  
        // Adjust the month to December from March 
        Temporal localDate2 
            = Month.DECEMBER 
                  .adjustInto(localDate1); 
  
        // Find the day from the new Local date 
        Month monthOfYear2 
            = Month.from(localDate2); 
  
        // Printing the new Local Date 
        System.out.println(localDate2 
                           + " which is "
                           + monthOfYear2.name()); 
    } 
}

输出：

2019-03-18 which is MARCH
2019-12-18 which is DECEMBER

参考： https://docs.oracle.com/javase/8/docs/api/java/time/Month.html#adjustInto-java.time.temporal.Temporal-

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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 Month adjustInto() method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。