File Permissions

[Joe Pluta]

This question was asked three years ago, and the answer was "you can't do that." I'm wondering if this has changed. Here's the question:
You can do setReadOnly() on a java.io.File object, but there's no analogous setReadWrite(). In fact, there seems to be no way to control the permissions or attributes of a File object.
So, has anybody figured out a workaround? How platform-specific is it? I'm trying to do something on OS/400, and so it will be a little different than anything else, although it will probably most closely resemble some sort of ISO Unix technique.
Joe

[Jeanne Boyarsky]

I think it still can't be done in pure Java. If you are sure of the platform, you can use Runtime.exec(). But that's as platform specific as you can get.

[Joel McNary]

Using Runtime.exec() is probably still the only really good way to do this. What you might do is set up a .properties file contiaining the command/commands to set the permissions. Then, when you move to a different platform, you simply change the .properties file.
Not the most elegant solution, but it would mean that you don't have to re-compile code.