带有示例的 Java 中的 Hour()方法的本地日期时间

原文:https://www . geesforgeks . org/local datetime-with our-method-in-Java-with-examples/

Java 中 LocalDateTime 类的withour()方法用于获取该 LocalDateTime 的副本，其中小时被更改为小时，并作为参数传递给该方法。该本地日期时间的其余值保持不变。

语法:

public LocalDateTime withHour(int hours)

参数:此方法接受单个强制参数小时数，该参数指定要在结果本地日期时间实例中设置的小时数。这个小时的值可以从 0 到 23。

返回:该函数返回一个本地日期时间实例，将小时数改为小时数作为参数传递给该方法。该本地日期时间的其余值保持不变。

异常:如果小时值无效，该函数将抛出日期时间异常。

下面的程序说明了 LocalDateTime.withHour()方法:

程序 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));
    }
}

输出:

Original LocalDateTime: 2018-11-30T12:53:06.591
New LocalDateTime: 2018-11-30T00:53:06.591

程序二:

// 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));
    }
}

输出:

Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-06T20:15:30

参考:https://docs . Oracle . com/javase/10/docs/API/Java/time/local datetime . html # withour(int)

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