Flexible, Reliable Software Using Patterns and Agile DevelopmentYou will be able to buy the book at Stakbogladen, Naturfag in Vandrehallen.
CRC Press 2010, Henrik Bærbak Christensen.
Official web: CRC Press / FRS .
Note: There are a few major errors in the book (and a lot of minor spelling and grammar errors). Please consult the Erratum for a list of errors.
If your Java is rusty, then the cheapest reference is the Java Tutorial. The java tutorial is a book available freely from the Oracle/Sun Java website. The link is Java Tutorial.