Just OK 3

The book suffers from a hazardous time for translation, or at least the use of certain words like "implementation" (which should be replaced by "implementation") is not appropriate, which does not facilitate the understanding of certain paragraphs.

Also, if the example stuck a little more real life instead of focusing on a single topic, this would allow the reader a better understanding and thus easier to adapt certain patterns.

Finally, the coding conventions are not respected: non-prefixed interfaces of a capital "I", the names of public methods without a capital and so on. For a book that is supposed to learn good programming practices, it is a little way.