Java程序将此持续时间转换为总长度（以纳秒为单位）
这样，可以在数天，数小时和数分钟内获得纳秒。首先，设置持续时间：
Duration d1 = Duration.ofDays(5); Duration d2 = Duration.ofHours(20); Duration d3 = Duration.ofMinutes(15);
将以上持续时间转换为纳秒：
System.out.println("Nanoseconds in 5 days = "+d1.toNanos());
System.out.println("Nanoseconds in 20 hours = "+d2.toNanos());
System.out.println("Nanoseconds in 15 minutes = "+d3.toNanos());示例
import java.time.Duration;
public class Demo {
public static void main(String[] args) {
Duration d1 = Duration.ofDays(5);
Duration d2 = Duration.ofHours(20);
Duration d3 = Duration.ofMinutes(15);
System.out.println("Nanoseconds in 5 days = "+d1.toNanos());
System.out.println("Nanoseconds in 20 hours = "+d2.toNanos());
System.out.println("Nanoseconds in 15 minutes = "+d3.toNanos());
}
}输出结果
Nanoseconds in 5 days = 432000000000000 Nanoseconds in 20 hours = 72000000000000 Nanoseconds in 15 minutes = 900000000000
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