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.
Find your Java installation folder and explore it until you find a file called "src.zip". Unzip it into a folder called src, then explore to find the java folder then the util folder then the ArrayList file then read the toString() method.