Your post is rubbish, you don't know what China plan is. Do you know what happens in the pacific? China has already started conquering Spratly Islands that belongs to Vietnam and Philippines, Senkaku that belongs to Japan. They already harrassing with its powerful Navy. How much more if China gain more power. Without America, I'm sure China has already conquered Vietnam and Philippines.
China has longstanding territorial disputes over all those territories. And Senkaku is currently under the defacto administration of Japan. The PLA Navy is no match for the powerful Japanese navy. So you can't say that they are harassing. Either you don't know much details about the Japanese Navy, or you are seriously overestimating the capabilities of the PLAN.