.

Simply so, how many castes does Japan have?

(a) In Japan there are only two castes, heimin and burakumin with the latter not more than 2 per cent of the total Japanese population.

Likewise, who are the burakumin of Japan? Burakumin is a polite term for the outcasts from the four-tiered Japanese feudal social system. Burakumin literally means simply "people of the village." In this context, however, the "village" in question is the separate community of outcasts, who traditionally lived in a restricted neighborhood, a sort of ghetto.

Beside above, does China have a caste system?

Hukou, China's Caste System. China's Hukou system is similar to a caste system in that the socioeconomic opportunities of individuals are largely determined by birth. As China has progressed and more opportunities have sprung up in cities--particularly those in coastal areas--those in rural areas have been left behind.

Is there caste system in foreign countries?

No, not at all. Every country has a caste system, it's just not called a caste system in those countries.