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.
Check your code, make needed changes, and recompile. Every aspect of this line (except the name "args", which is arbitary, and the qualified "public" which some Java implementations don't care about) is necessary, and changing any of them would lead to the error message you described.