Tank Ace, numbers are pretty even fighter wise, and that's not including the US fighters in Japan. Not to mention quality, 200 of Japan's fighters are very advanced versions of the F15, and nearly 100 of them the F2, similar to the F16 in capability. Even the 80 or so F4 Phantoms still have an excellent modern radar and an even better A2A missile than the Aim120, with Mach 5 speed and its own mini AESA radar seeker, and 120+range. That's nearly 400 very, very capable fighters supported by even better AWACS aircraft than what NATO typically uses.
Japan's AEW capability is excellent as well, and although they have a small tanker force, they are well practiced and trained in employing this asset. Also, it isn't just simple numbers, China will have to be able to actually GET the fighters to where they are needed and keep them there. Looking at the map, the Chinese will have to stage WAY out there if they wanted to actually come out and make trouble with their fighters. They would be at the edge of their fuel envelope with most of their types, and not be able to maneuver about the battle space at will, that's for certain. The J10 are pretty short range fighters, and without massive, massive tanker support, wouldn't be able to stage out that far, and even if they can, staying out there for long and doing anything is a big problem for them. Again, that large ocean thing in the way, This isn't Aces High where there are two enemy airfields within easy striking range, it's the real big world of the Pacific. It's this reason that China is getting into the carrier business, and quickly, as the distances in the region are obviously vast, and the only other option for projecting air power than CVN's is to actually take new territory with existing runways, or build your own. The world is out of free areas to build air bases that are up for the taking in the Pacific, which is really what this is all about in the first place, right.