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.
with checked Exception,you must checked in your block or throws it. with unchecked Exception,you can ignore it or catch it if you want. And the unchecked Exception is the subclass of RuntimeException. That's all