A logic book with OO in Java

I just finished reading, at 2 a.m., Fernando Anselmo's book Aplicando Lógica Orientada a Objetos em Java - 2005 (177 pages). The language is very approachable and it's full of exercises (okay, I didn't do them). Reading it was great/excellent for me, and I promise I'll re-read it doing the proposed exercises. At the end there's a really cool robots game — I found it very interesting and want to build it myself. The book covers everything from Java basics to the more complex concepts, and also explains UML in a very simple yet rich way (it was the course I was going to take this semester, but couldn't). Professor Fernando shows programming logic in a very didactic and enjoyable way to read and learn, with even a humorous tone, and exercises that aren't that hard at the beginning (it's frustrating when you open a book and right away the author shows off with overly complex exercises, while the cover says: Basic). His approach to Object Orientation is very good — Java is fully OO. Fernando is the coordinator of DFJUG. I don't earn anything from this, but I'll recommend the professor's book. I recommend this book to any Java programmer (beginner and advanced). I borrowed it from the Uniderp library, but I want to buy a copy for reference. And early this morning I started reading another book on Object Orientation in Java, a PLT book from Anhanguera, also very interesting and didactic. I'm also reading Desenvolva Aplicativos com Java 2, by Renato Rodrigues Filho — an outstanding book as well, the guy really knows his stuff! It's also borrowed from the UNIDERP library.