How to compare a file in a project with one in the filesystem in eclipse?

Question

I have an eclipse project containing a source file. Now I have a different version of that file somewhere in the filesystem (not inside an eclipse project).

I can open the second file in eclipse, but I find no way to compare it to the first file.

How can I compare these two files?

Answer 1

Or use WinMerge as external programm - aslo not true way, but fast and simple.

Interesting article "Compare with" Dialog

Answer 2

A simple way is to make a temporary copy in your Eclipse workspace, in the same directory to make it even easier. Then compare, then delete.

Not the ideal theoretical way, but fast and simple to remember.

It's what I use, but I'm open to improving my ways :-)