Why did china and japan isolate themselves from european trade

Imperial China suspected that they were unrivaled and that they had all the stuff that the Europeans as of now have. So they didn't need anything from them. China had dependably thought itself as the focal point of the world along these lines its name signifying "Focal/Middle Kingdom." But much to their dismay that Europe amidst the nineteenth century had gotten on to them and in the long run would outperform China monetarily. So China's haughtiness and thought of prevalence was a reason over the ruin of the Chinese domain. Japan then again discovered that they needed to adjust and acknowledge that Western innovation had outperformed the East to survive. Japan rapidly ended up industrialized and furthermore outperformed China. Japan at that point turned into a Great Power and figured out how to crush the Russians and colonized the greater part of East Asia and Southeast Asia.