This is one of the good questions I ask to check whether the candidate is aware of recent development in Java technology space or not. Even though JDK 7 was not a big bang release like JDK 5 or JDK 8, it still has a lot of good feature to count on e.g. try-with-resource statements, which free you from closing streams and resources when you are done with that, Java automatically closes that. Fork-Join pool to implement something like the Map-reduce pattern in Java. Allowing String variable and literal into switch statements. Diamond operator for improved type inference, no need to declare generic type on the right-hand side of variable declaration anymore, results in more readable and succinct code. Another worth noting feature introduced was improved exception handling e.g. allowing you to catch multiple exceptions in the same catch block.
