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.
Where that value comes from is platform-specific, but certainly "dot" is not a particularly useful result. I don't know why it would do that, but if your main concern it just getting a meaningful value, you could try something like this: