Hi there,
I'm rather puzzled by your code. Firstly, your 2 methods won't work. The add method is merely adding a new meeting to a local list, i.e., they won't be around when you exit the method call. Your listing method is listing nothing. Again, your local variables don't contains any information.
Lastly, what is this Meeting object? Unless you have this class in the same directory as your diary, your code most likely will not compile.