Contemporary Japan & China Relations

The segment of Professor Katada's presentation that was perhaps most fascinating to me was the section on how contemporary Japan is functioning economically as a power in the global economy. I had absolutely no idea how Trump's "hostility" toward China (and leaving the TPPwith Japan), has helped develop a closer relationship between two Asian rivals: China and Japan. I also had no idea that the agricultural economy in Japan was so powerful that it almost dissuaded the entire country from joining the TPP...I can understand how an economy that is competitive within itself (between cars & agric.) can be beneficial to growing wealth, but how do other industries react when hearing about governmental favoritism to the agriculture industry? Are other segments of the Japanese economy frustrated by govermental protections, like the 1700% tariff on Devil's Tongue or 780% tariff on rice? I truthfully am very ignorant about all the details of how the U.S. economy functions and am now very curious about the industries that U.S. government protects as well...