make code compiles with jdk 6

This pull request closes #58 it changes the code so that it compiles with jdk 6 instead of 7. 
At the root of this project, you can find a formatter for spoon project (https://github.com/INRIA/spoon/blob/master/SpoonFormatterPrefs.xml). If everyone use his own formatter, source code will quickly become unreadable.

Can you use it ? Or put braces at the end of the signature of the method ?

Thanks in advance.