To be fair that was quite a late addition to the language all things considered. It could be he learned Java before it existed, or had most of his experience in

To be fair that was quite a late addition to the language all things considered. It could be he learned Java before it existed, or had most of his experience in 1.4 (which survived quite long in some environments because 1.5 was such a huge overhaul). But still, a good dev will keep up to date with language features.