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China will have to maintain fast detection, tracing testing and quarantine. It’s reasonable to expect minor outbreaks and several larger waves. This is the least bad option really. On the plus side, they will only get better at this and the measures easier to comply with.
You won’t have true herd immunity in (for example) the UK population until you have a vaccine (and program to keep generating new vaccines).
But China still has 1.4B people to either expose to the virus or vaccinate. What's for sure is their coping strategy is not sustainable in the long-term without dramatically altering their position on the global stage.
There are only 3 strategies for Earthlings:
Eliminate the virus out of extinction
Herd immunity*
Vaccination*
*May or may not work dependant on how the virus mutates.