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.
An error like "unresolved compilation problem" probably means that you have some old *.class files somewhere and that the compiler gets confused. Delete all your *.class files and re-compile everything again.
What is wrong: Look at lines 2 and 5. What do you think could be wrong there?