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.
You can indeed do that using a decompiler, but don't expect that the output will be exactly the same as the original source code. Some information, like names of local variables, is lost in the compilation process, so it's impossible to get those names back by decompiling.