Java 中的 Month adjustInto()方法

原文:https://www . geesforgeks . org/month-adjustino-method-in-Java/

java.time.Month ENUM 的 adjustInto()方法是 java 中的一个内置函数，它接受一个指定日期的时态对象，并返回一个与输入相同的可观察类型的新时态对象，其中月份被替换为一年中的这个月份。

方法声明 :

public Temporal adjustInto(Temporal temporal)

语法 :

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

参数:该方法以时态为参数，其中:

  • 时间–是需要调整的指定日期。
  • any MONTH–是日期要调整到的指定月份，例如，JANUARY、FEDERAL 等。
  • 新日期–是修改日期。

返回值:该函数返回一个调整后的时态对象，该对象是根据指定月份调整的日期。

异常 :

  • Date and time exception : This method throws this exception if adjustment cannot be made.
  • Arithmetic exception : If there is a numerical overflow, this exception will be thrown.

下面的程序说明了上述方法:

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

程序二 :

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-

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