NIO2 路径符号 Java

Question

If I created a two paths such as:

    Path path3 = Paths.get("E:\\data");
    Path path4 = Paths.get("E:\\user\\home");

And then make a new Path(relativePath) by using the relativize() method on the two paths, creating: "..\user\home" does the path symbol( .. ) in this case refer to "data" or does it just indicate a relative path?

        Path relativePath = path3.relativize(path4);
        // ..\user\home <- output

So my Question is, what does the Path symbol ( .. ) represent?

Answer 1

The relativize method needs two inputs but doesn't "secretly" encode the base path into it's output, so your relativePath has to be applied to another base path to actually access a path on disk.

But you can apply it to a different base path, eg if you want to sync two folder structures below two different base paths.

tl;dr: it just indicates a relative path.

But take care with your path separator: if you hardcode that into your path strings like in your example, it will fail on other systems. Better split up the individual parts in extra strings like this:

Path path4 = Paths.get("E:", "user", "home");