如何从日期获取微秒？ [英] How to get the microseconds from a Date?

问题描述

我试图从日期中获取微秒，但我不能。

I am trying to get microseconds from a Date, but I can't.

Date date = new Date()

推荐答案

否，日期仅将值存储为毫秒精度。如果您希望获得微秒级的精度，则可能需要查看 JSR-310 或 java.sql.Timestamp 有点黑客-但不要指望任何内置类，例如 Calendar 和 DateFormat

No, Date only stores values to millisecond accuracy. If you want microsecond accuracy, you might want to look at JSR-310, or java.sql.Timestamp as a bit of a hack - but don't expect any of the built-in classes such as Calendar and DateFormat to handle anything beyond milliseconds.

如果要尝试执行 timing （例如用于基准测试），则应使用 System.nanoTime ，但是应该只将它们用于类似秒表的用例-它不会为您提供有意义的当前挂钟时间方式。

If you're trying to perform timing (e.g. for benchmarking) you should use System.nanoTime, but that should only be used for stopwatch-like use cases - it doesn't give you the "current wallclock time" in a meaningful way.

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