Return a collection instead of a set.
-rw-r--r-- 345 .classpath
-rw-r--r-- 5 .gitignore
-rw-r--r-- 366 .project
drwxr-xr-x - .settings
-rw-r--r-- 844 javadoc.xml
drwxr-xr-x - src
drwxr-xr-x - test