hey ,

I recommand to read the

UML Distilled 3rd Edition by Martin Fowler

it's have all you need for OO , it's most completed book in the world , don't miss it

and I suggest to read the RUP Practitioner's Guide ,

and at last , it's not bad to read the Apply UML by Grady Booch , Jacobson &  Rumbaugh

hey man dont miss the UML Distilled it will change your life ,

tell me if it change it ,,,;)