This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Also, please note that identifiers may not begin with a digit. But digits are allowed as the second or subsequent characters. This is primarily to avoid conflicts with numeric literals (e.g. 1L or 1.0f).