Java 中带有 Nano()方法的 LocalDateTime，示例
原文:https://www . geesforgeks . org/local datetime-with nano-method-in-Java-with-examples/
Java 中 LocalDateTime 类的 withNano() 方法用来获取这个 LocalDateTime 的副本，其中 nano-seconds 改为 nano-seconds 作为参数传递给这个方法。该本地日期时间的其余值保持不变。
语法:
public LocalDateTime withNano(int nanoSeconds)
参数:单个强制参数纳秒，指定要在结果本地日期时间实例中设置的纳米秒。这些纳米秒的值的范围可以从 0 到 999999999。
返回类型:一个本地日期时间实例，将纳米秒更改为纳米秒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:如果纳米秒值无效，该功能会抛出日期时间异常。
例T2【1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate withNano() method of
// LocalDateTime class
// Importing required classes
import java.time.*;
import java.util.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating tan instance of LocalDateTime class
LocalDateTime dt = LocalDateTime.now();
// Getting the String representation of this
// LocalDateTime
System.out.println("Original LocalDateTime: "
+ dt.toString());
// Getting a new LocalDateTime with nano-seconds 0
System.out.println("New LocalDateTime: "
+ dt.withNano(0));
}
}
Output:
Original LocalDateTime: 2018-11-30T12:54:17.484
New LocalDateTime: 2018-11-30T12:54:17
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate withNano() method of
// LocalDateTime class
// Importing required classes
import java.time.*;
import java.util.*;
// Main class
public class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating an object of LocalDateTime class inside
// main()
LocalDateTime dt
= LocalDateTime.parse("2015-04-06T10:15:30");
// Getting the String representation of this
// LocalDateTime
System.out.println("Original LocalDateTime: "
+ dt.toString());
// Getting a new LocalDateTime with nano-seconds
// 99999
System.out.println("New LocalDateTime: "
+ dt.withNano(99999));
}
}
Output:
Original LocalDateTime: 2015-04-06T10:15:30
New LocalDateTime: 2015-04-06T10:15:30.000099999
现在我们将小心处理 Nano(0)方法用于去除 Nano 秒并保留日期时间至秒。
例 3:
注意:特殊情况:如果秒值为:00，那么在 toString()上做的同时会消除秒部分。
示例:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate withNano() method of
// LocalDateTime class
// Importing required classes
import java.io.*;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
// Main class
class GFG {
// Main driver method
public static void main(String[] args)
throws InterruptedException
{
// Creating an object of DateTimeFormatter class
DateTimeFormatter dtf
= DateTimeFormatter.ISO_DATE_TIME;
// If condition holds true
while (true) {
// Making thread to sleep for 500 nanoseconds
Thread.sleep(500);
// Print and display commands
System.out.println("Original :00 seconds --> "
+ LocalDateTime.now());
System.out.println(
"Without Formatter(Observe when seconds is :00) --> "
+ LocalDateTime.now().withNano(0));
System.out.println(
"With Formatter -> "
+ LocalDateTime.now().withNano(0).format(
dtf));
}
}
}
输出:
[https://media.geeksforgeeks.org/wp-content/uploads/20211028200053/spl_case.mp4](https://media.geeksforgeeks.org/wp-content/uploads/20211028200053/spl_case.mp4)版权属于：月萌API www.moonapi.com，转载请注明出处
