java 根据类名示例化类

即时类minusNanos()方法 (Instant Class minusNanos() method)

• minusNanos() method is available in java.time package.

  minusNanos()方法在java.time包中可用。

• minusNanos() method is used to subtract the given duration in nanoseconds from this Instant and returns the Instant.

  minusNanos()方法用于从此Instant减去给定的持续时间(以纳秒为单位)，并返回Instant。

• minusNanos() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  minusNanos()方法是一个非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• minusNanos() method may throw an exception at the time of performing subtraction.

  minusNanos()方法在执行减法时可能会引发异常。

  ArithmeticException: This exception may throw when the calculated result value exceeds the limit.

  ArithmeticException ：当计算结果值超过限制时，可能引发此异常。

Syntax:

句法：

    public Instant minusNanos(long nanos_val);

Parameter(s):

参数：

• long nanos_val – represents the nanoseconds to be subtracted from this Instant.

  long nanos_val –表示要从此Instant减去的纳秒。

Return value:

返回值：

The return type of this method is Instant, it returns the Instant that holds the value subtracted the given duration in nanoseconds from this Instant.

此方法的返回类型为Instant ，它返回的Instant保持从该Instant减去给定持续时间(以纳秒为单位)的值。

Example:

例：

// Java program to demonstrate the example
// of minusNanos(long nanos_val) method
// of Instant
import java.time.*;
public class MinusNanosOfInstant {public static void main(String args[]) {long nanos = 200000;
// Instantiates two Instant
Instant ins1 = Instant.parse("2006-04-03T05:10:15.60Z");
Instant ins2 = Instant.now();
// Display ins1,ins2 and nanos
System.out.println("Instant ins1 and ins2: ");
System.out.println("ins1: " + ins1);
System.out.println("ins2: " + ins2);
System.out.println("nanos to substract: " + nanos);
System.out.println();
// Here, this method subtracts the given duration
// in nanoseconds from this Instant ins1
// i.e. here we are substracting the given
// 200000 nanos from this ins1
Instant minus_nanos = ins1.minusNanos(nanos);
// Display minus_nanos
System.out.println("ins1.minusNanos(nanos): " + minus_nanos);
// Here, this method subtracts the given duration
// in nanoseconds from this Instant ins2
// i.e. here we are substracting the given
// 200000 nanos from this ins2
minus_nanos = ins2.minusNanos(nanos);
// Display minus_nanos
System.out.println("ins2.minusNanos(nanos): " + minus_nanos);
}
}

Output

输出量

Instant ins1 and ins2:
ins1: 2006-04-03T05:10:15.600Z
ins2: 2020-05-26T23:36:39.457119Z
nanos to substract: 200000ins1.minusNanos(nanos): 2006-04-03T05:10:15.599800Z
ins2.minusNanos(nanos): 2020-05-26T23:36:39.456919Z

翻译自: https://www.includehelp.com/java/instant-minusnanos-method-with-example.aspx

java 根据类名示例化类