问题描述
scala> import java.nio.file._
import java.nio.file._
scala> Files.copy(Paths.get(),Paths.get())
res0:java.nio.file.Path =
不应该抛出 NoSuchFileException
?
显示:
但是我不确定这是真正的原因,因为 Files.copy(Paths.get a),Paths.get(a))
无法正常工作。
您可能需要查看提供了一个空字符串(它产生一个空的路径)和http://download.oracle.com/javase/7/docs/api/java/nio/file/Path.html有关空路径的详细信息:
你的代码得到一个空的路径是有效的,然后认为源和目的地是相同的。
I'm really wondering what this code does:
scala> import java.nio.file._
import java.nio.file._
scala> Files.copy(Paths.get(""), Paths.get(""))
res0: java.nio.file.Path =
Shouldn't that throw a NoSuchFileException
?
Reading the JavaDoc reveals:
But I'm not sure this is the true cause, because Files.copy(Paths.get("a"), Paths.get("a"))
fails as expected.
You might want to check http://download.oracle.com/javase/7/docs/api/java/nio/file/Paths.html for what paths.get does when provided an empty string (it generates an empty path) and http://download.oracle.com/javase/7/docs/api/java/nio/file/Path.html for details on what an empty path means:
So it looks like your code is getting an empty path which is valid and then considers the source and destination to be the same.
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