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Java LocalDateTime withHour()用法及代碼示例


Java中的LocalDateTime類的withHour()方法用於獲取此LocalDateTime的副本,並將小時數更改為作為此方法的參數傳遞的小時數。此LocalDateTime的其餘值保持不變。

用法:

public LocalDateTime withHour(int hours)

參數:此方法接受單個強製性參數hours,該參數指定要在結果LocalDateTime實例中設置的小時數。該小時數的範圍是0到23。


返回值:該函數返回LocalDateTime實例,並將小時數更改為作為此方法的參數傳遞的小時數。此LocalDateTime的其餘值保持不變。

異常:如果小時值無效,則該函數將引發DateTimeException。

以下示例程序旨在說明LocalDateTime.withHour()方法:

示例1:

// Program to illustrate the withHour() 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 hours 0 
        System.out.println("New LocalDateTime: "
                           + dt.withHour(0)); 
    } 
}
輸出:
Original LocalDateTime: 2018-11-30T12:53:06.591
New LocalDateTime: 2018-11-30T00:53:06.591

示例2:

// Program to illustrate the withHour() 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 hours 20 
        System.out.println("New LocalDateTime: "
                           + dt.withHour(20)); 
    } 
}
輸出:
Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-06T20:15:30

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



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注:本文由純淨天空篩選整理自gopaldave大神的英文原創作品 LocalDateTime withHour() 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。