This is one of my favorite sites for code snippets, white papers. Here's a particular snippet to do sorting, but it's in C#:

http://www.codeproject.com/csharp/customcollection.asp

>So I am trying to learn about OOP, but I am stuck on interfaces. I understand what they are and what they are used for, but i am having problems actually IMPLEMENTING them. For example, I have a Collection class which I want to bind to a datagrid, which I can do using the IBindingList interface, but now I want to implement sorting and I am having a hard time finding good examples. All the "simple" examples I can find are good, but don't show how to implement sorting.
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>Does anybody know of a good website/book/etc. that tells all about interfaces and gives good examples?