Ora et Collabora

Always good as a refresher. So, when calling a method For primitive arguments ( int ,  long , etc.), the pass by value is  the actual value  of the primitive (for example, 3). For objects, the pass by value is the value of  the reference to the object . http://stackoverflow.com/questions/40480/is-java-pass-by-reference-or-pass-by-value

I stumbled upon this one, as a rookie :) http://www.programcreek.com/2014/01/java-util-concurrentmodificationexception/ whohaaa, it hurts :)