This is my practice code for Head First Design Patterns, and it is compatible with Java 8.
You can download the code and compile and run from the command line, or load the code into project in Eclipse (Kepler, with the Java 8 beta patch).
https://wiki.eclipse.org/JDT/Eclipse_Java_8_Support_For_Kepler
Other links for the book are available on the book page at wickedlysmart.com.