Java 中的 LocalTime withNano()方法,示例

原文:https://www . geesforgeks . org/local time-with nano-method-in-Java-with-examples/

一个 LocalTime 类的 withNano() 方法用于获取这个 LocalTime 的副本,其中 Nano 被更改为 NaNO,并作为参数传递给这个方法。该本地时间的剩余值将保持不变。此实例是不可变的,不受此方法调用的影响。

语法:

public LocalTime withNano(int nano)

参数:该方法接受单个参数 nano ,表示要在结果中设置的纳米秒,从 0 到 999,999,999。

返回值:这个方法返回一个本地时间实例基于这个时间与请求的 nano。

异常:如果纳米值无效,该方法抛出异常日期时间异常

以下程序说明了 withNano()方法:

程序 1:

// Java program to demonstrate
// LocalTime.withNano() method

import java.time.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a LocalTime object
        LocalTime time
            = LocalTime.parse("19:34:50.63");

        // print time
        System.out.println("Old LocalTime: "
                           + time);

        // Get a new LocalDateTime with nanos 100000
        LocalTime newtime = time.withNano(100000);

        // print result
        System.out.println("New LocalDateTime: "
                           + newtime);
    }
}

输出:

Old LocalTime: 19:34:50.630
New LocalDateTime: 19:34:50.000100

程序二:

// Java program to demonstrate
// LocalTime.withNano() method

import java.time.*;

public class GFG {
    public static void main(String[] args)
    {

        // create a LocalTime object
        LocalTime time
            = LocalTime.parse("01:21:30.13");

        // print time
        System.out.println("Old LocalTime: "
                           + time);

        // Get a new LocalDateTime with nanos 999999
        LocalTime newtime = time.withNano(999999);

        // print result
        System.out.println("New LocalDateTime: "
                           + newtime);
    }
}

输出:

Old LocalTime: 01:21:30.130
New LocalDateTime: 01:21:30.000999999

参考文献:https://docs . Oracle . com/javase/10/docs/API/Java/time/local time . html # with nano(int)