NetBeans Quick Tip #10 - Diffing Two Files
By Roman Strobl on VII 14, 2005
Did you know that NetBeans has built in diff which you can use to see differences between two files? Most people know the diff view from versioning support. Hovewer you can diff files even if you are not using versioning. The trick is that you have to select two files in the Projects view, invoke context menu and go to Tools | Diff. The submenu appears only if you select two files, otherwise it's perfectly hidden so that only experienced users can find it :-)
Here is a screenshot of the diff view:
Wondering about the history of diff? See the entry in wikipedia.