什么使文件成为一个文件夹？ [英] What makes a file into a folder?

问题描述

文件和文件夹之间的（文件系统特定的）区别是什么？

为什么需要 java.nio.file.Files 中的不同方法来创建这一个或另一个？ createDirectory（..）和 createFile（..）。两者都使用 Path 作为文件系统对象的句柄/标识符。

一个或另一个失败的情况下（除了使用不同的方法来创建一个或另一个）？

对于创建文件或文件夹，如果已经有一个同名的文件或文件夹，这是一个失败的情况。如果它将是一个r / w文件或文件夹，在文件夹的情况下，可写入的手段文件可能会在其中创建，在文件的情况下，这意味着写入字节 - 是否有区别如何检查？

如果实际上对于失败情况没有区别，我想抽象出一个自定义的 FileSystemObject 他们都是一样的。

解决方案

好的问题。

最常见的操作系统（Windows，Linux等），一个文件夹可以包含的东西。那些东西有名字每一件东西都可以是一个文件或一个目录。

所以你可能有一些文件夹有以下内容：

  a 
b 
dc 
dd 
  

a 和 b 是文件。 c 和 d 是文件夹。 a 和 b 只能包含二进制数据。但是 c 和 d 可以包含其他文件/文件夹。

<例如 c 可能如下所示：

  afile 
 anotherfile 
d morestuff 
d stuff 
  

这样可以使层次结构你想要的深度，结构，但你想要的。这是一个递归数据结构的一个非常基本的例子。选择是否制作文件或文件夹是有用的，因为文件和文件夹是不同类型的东西。一个文件系统可能有文件也是文件夹，但我从来没有见过这样的文件系统。以Windows / Linux为例，如果你制作一个文件，你不能把它作为一个文件夹，你只能改变文件的内容（这只是任意的二进制数据）。

What is the (file system specific) difference between a file and a folder?

Why are different methods in java.nio.file.Files required to create the one or the other? createDirectory(..) and createFile(..). Both use Path as a handle / identifier for the file system object.

Should I think of something special while creating one or the other as of failure cases (besides using different methods for creating the one or the other) ?

For the creation of a file or folder, if there is already a file or folder with the same name, this is a failure case. If it is going to be an r/w file or folder, in the folder case writable means files may be created in it and in the file case it means writing bytes to it - is there a difference how to check this ?

If actually there is no difference for the failure cases, I would like to abstract away a custom FileSystemObject and treat them all the same.

解决方案

Good question.

In the most common operating systems (Windows, Linux, etc.), a folder can contain things. Those things have names. Each thing can either be a file or a directory.

So you might have some folder that has the following:

  a
  b
d c
d d

a and b are files. c and d are folders. a and b can only contain binary data. But c and d can contain other files/folders.

For example c might look like this:

  afile
  anotherfile
d morestuff
d stuff

This allows you to make a hierarchy as deep as you want, structured however you want. It is a very basic example of a recursive data structure. It's useful to choose whether you're making a file or folder since files and folders are separate types of things. A filesystem could have files that are also folders, but I've never seen any filesystem like that. In Windows/Linux for example if you make a file, you can't use it as a folder, you can only change the contents of the file (which is just arbitrary binary data).

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