This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
if you need to call the overloaded constructors from other constructors you must use this() or this(arguments...) depending on what you need. Instead if you try to call the overloaded constructor as 'testCon(2);' (as you did) then the compiler complains as it will not find any method definition 'testCon8(int arg)' in your class definition. That is the reason why you get the compiler-error.