Design Patterns Java Workbook …
The Design Patterns Java Workbook, Steven John Metsker (Addison-Wesley) is a great book covering the usual Desing Patterns and more with a set of exercises after each pattern to test your knowledge. The book is very clear and concise with good class diagrams and java code. There are 15 patterns covered. I found this book a more useful read than the Head First series on the same topic.