Java中的 Instant minusNanos() 方法和示例
Instant 类的minusNanos()方法从这个瞬间减去作为参数传递的纳秒值,并将结果作为一个瞬间对象返回。这个返回的 Instant 是不可变的。
句法:
public Instant minusNanos(long nanosToSubtract)
参数:此方法接受一个参数nanosToSubtract ,它是要减去的纳秒。
返回:此方法在减去纳秒后返回Instant 。
异常:此方法抛出以下异常:
- DateTimeException : 如果结果超过最大或最小瞬间。
- ArithmeticException : 如果发生数值溢出。
下面的程序说明了 minusNanos() 方法:
方案一:
Java
// Java program to demonstrate
// Instant.minusNanos() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant
= Instant.parse("2018-12-30T19:34:50.63Z");
// current Instant
System.out.println("Initialize instant: "
+ instant);
// subtract 430000000 nanoseconds
// means .43 seconds from this instant
Instant returnedValue
= instant.minusNanos(430000000);
// print result
System.out.println("Returned Instant: "
+ returnedValue);
}
}
Java
// Java program to demonstrate
// Instant.minusNanos() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant = Instant.now();
// current Instant
System.out.println("Current instant: "
+ instant);
// subtract 540000000 nanoseconds
// means .564 seconds from this instant
Instant returnedValue
= instant.minusNanos(540000000);
// print result
System.out.println("Returned Instant: "
+ returnedValue);
}
}
输出
Initialize instant: 2018-12-30T19:34:50.630Z
Returned Instant: 2018-12-30T19:34:50.200Z
方案二:
Java
// Java program to demonstrate
// Instant.minusNanos() method
import java.time.*;
public class GFG {
public static void main(String[] args)
{
// create a Instant object
Instant instant = Instant.now();
// current Instant
System.out.println("Current instant: "
+ instant);
// subtract 540000000 nanoseconds
// means .564 seconds from this instant
Instant returnedValue
= instant.minusNanos(540000000);
// print result
System.out.println("Returned Instant: "
+ returnedValue);
}
}
输出:
Current instant: 2018-11-27T06:43:58.495Z
Returned Instant: 2018-11-27T06:43:57.955Z
参考资料:https: Java/time/Instant.html#minusNanos(long)