Java LocalDateTime withDayOfMonth()用法及代碼示例

Java中的LocalDateTime類的withDayOfMonth()方法用於獲取此LocalDateTime的副本，並將dayOfMonth更改為dayOfMonth，並將其作為參數傳遞給此方法。此LocalDateTime的其餘值保持不變。

用法:

public LocalDateTime withDayOfMonth(int dayOfMonth)

參數：此方法接受單個強製性參數dayOfMonth，該參數指定要在結果LocalDateTime實例中設置的dayOfMonth。該dayOfMonth的值可以在1到31之間。

返回值：該函數返回LocalDateTime實例，其中dayOfMonth更改為dayOfMonth，並作為參數傳遞給此方法。此LocalDateTime的其餘值保持不變。

異常：如果dayOfMonth值無效，該函數將引發DateTimeException。

以下示例程序旨在說明LocalDateTime.withDayOfMonth()方法：

示例1:

// Program to illustrate the withDayOfMonth() method 
  
import java.util.*; 
import java.time.*; 
  
public class GfG { 
    public static void main(String[] args) 
    { 
        // Get the LocalDateTime instance 
        LocalDateTime dt = LocalDateTime.now(); 
  
        // Get the String representation of this LocalDateTime 
        System.out.println("Original LocalDateTime: "
                           + dt.toString()); 
  
        // Get a new LocalDateTime with dayOfMonth 25 
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfMonth(25)); 
    } 
}

輸出：

Original LocalDateTime: 2018-11-30T10:38:27.429
New LocalDateTime: 2018-11-25T10:38:27.429

示例2:

// Program to illustrate the withDayOfMonth() method 
  
import java.util.*; 
import java.time.*; 
  
public class GfG { 
    public static void main(String[] args) 
    { 
        // Get the LocalDateTime instance 
        LocalDateTime dt 
            = LocalDateTime 
                  .parse("2015-04-06T10:15:30"); 
  
        // Get the String representation of this LocalDateTime 
        System.out.println("Original LocalDateTime: "
                           + dt.toString()); 
  
        // Get a new LocalDateTime with dayOfMonth 1 
        System.out.println("New LocalDateTime: "
                           + dt.withDayOfMonth(1)); 
    } 
}

輸出：

Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-01T10:15:30

參考： https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#withDayOfMonth(int)

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