Now that Nick Mangold and Darrelle Revis are gone, David Harris is the longest-tenured member of the New York Jets. He has witnessed a lot of stuff in 10 seasons, but nothing quite like this: A young, rebuilding team, facing dreadfully low outside expectations.

Nevertheless, he likes the new vibe in the locker room — he feels change was needed — and he believes this team could pull a fast one on the critics who say the Jets are doomed to another disastrous season.

They can say what they want. We know we didn’t have the best year last year. We are a young team, but I think we’re going to surprise people.

The Jets don’t have as much big-name talent as a year ago, but some of that talent was old and complacent, contributing to the 5-11 finish. Now it’s all about the youth movement, and Harris could feel the difference on Monday, the first day veterans and rookies were together in the locker room (this was before they turned out en masse to Harris’ event).

Harris said the mood was upbeat in the locker room, with rookies playing music, dancing and enjoying a light work day.