This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
When the Java compiler has to choose between a number of alternative methods that match a method call, it will choose the most specific one, if there is no ambiguity. In this case, the method that takes two Cs is the most specific one.