Eclipse method header error

I'm having trouble creating the most simple of methods in eclipse, I keep getting an error on the line that the method header is declared it looks like This(error information is in the console) This is just the code that i have to have written for the error to pop-up.) I haven't written code since before winter break so I don't know if I may have messed up my jdk or jre, but in all my past projects the methods work as they should and there are no errors, even if I create a new method.

edit: thanks dimoniy, it's been a long winter.