Java YearMonth withMonth()用法及代碼示例

YearMonth類的withMonth(int month)方法用於使用傳遞的month來更改YearMonth對象的month-of-year，然後該方法返回更改後的YearMonth的副本。如果day-of-month對於指定的月份無效，則將調整日期到最後一個有效的day-of-month。此實例是不可變的，不受此方法調用的影響。

用法:

public YearMonth withMonth(int month)

參數：此方法接受月份作為參數，即month-of-year，以將其設置在返回的year-month中，從1月(1月)到12月(12月)。

返回值：此方法返回基於此year-month的YearMonth以及所請求的月份。

異常：如果month-of-year值無效，則此方法引發DateTimeException。

以下示例程序旨在說明withMonth()方法：
示例1:

// Java program to demonstrate 
// YearMonth.withMonth() method 
  
import java.time.*; 
import java.time.temporal.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a YearMonth object 
        YearMonth yr 
            = YearMonth.of(2019, 12); 
  
        // print instance 
        System.out.println("YearMonth before"
                           + " applying method: "
                           + yr); 
  
        // apply withMonth method of YearMonth class 
        YearMonth updatedlocal = yr.withMonth(1); 
  
        // print instance 
        System.out.println("YearMonth after"
                           + " applying method: "
                           + updatedlocal); 
    } 
}

輸出：

YearMonth before applying method: 2019-12
YearMonth after applying method: 2019-01

示例2:

// Java program to demonstrate 
// YearMonth.withMonth() method 
  
import java.time.*; 
import java.time.temporal.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create a YearMonth object 
        YearMonth yr 
            = YearMonth.of(2022, 7); 
  
        // print instance 
        System.out.println("YearMonth before"
                           + " applying method: "
                           + yr); 
  
        // apply withMonth method of YearMonth class 
        YearMonth updatedlocal = yr.withMonth(12); 
  
        // print instance 
        System.out.println("YearMonth after"
                           + " applying method: "
                           + updatedlocal); 
    } 
}

輸出：

YearMonth before applying method: 2022-07
YearMonth after applying method: 2022-12

參考文獻： https://docs.oracle.com/javase/10/docs/api/java/time/YearMonth.html#withMonth(int)

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注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 YearMonth withMonth() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。