Nowadays chinese has more modern a/c in term of quantity and quality (J-10A, J-11B) compared to what currently Japan has (F15J, F1)
Dont talk nonsese about F-35. JMSDF need real carrier that can launch F-35, Hyuga wont be able to handle F-35, it is helicopter a/c.
And currently there is none F-35 in Japan air force, leave alone JMSDF.
By the time Japan air fore has F-35, PLAAF will already have J-20 or J-31.
By the time J-15 enter Chinese navy, I still dont see any possibility JMSDF will have any a/c that can be launched from Hyuga.
Maybe JMSDF will have real carrier? still maybe, but if that finally happen - then at that time you will see already J-31 or navalized J-20 launched from the new chinese second or third a/c carrier.
I am talking based on reality.