How does Japan make rules for immigrants?

Japan is a non-immigrant country and cannot immigrate. For foreigners, there are immigration laws, nationality laws and so on. As for how to make it, of course, it is also based on foreigners' study abroad, work and life problems, and even criminal acts. We should also attract some foreigners according to the employment situation of domestic people. If we want to build the 2020 Olympic Games, we will introduce more blue-collar workers.