THIS IS THE POINT.
SO, FOR CHINESE-CANADIAN, (FORMER CHINESE, INCLUDE ME MYSELF), NO NEED TO BE UPSET LIKE THAT, CHINA IS ANOTHER CONTRY TO YOU, JUST LIKE JAPAN, FRANCH, OR US.
日本国籍法第11条明确规定:
A Japanese national shall lose Japanese nationality when he or she acquires a foreign nationality by his or her own choice. 日本人根据自愿原则获得外国国籍时,将失去日本国籍。
日本国籍法第12条明确规定:
A Japanese national who was born in a foreign country and has acquired a foreign nationality by birth shall lose Japanese nationality retroactively as from the time of birth, unless the Japanese national clearly indicates his or her volition to reserve Japanese nationality according to the provisions of the Family Registration Law。在外国出生并因此获得外国国籍的日本人将从出生之日起失去日本国籍,除非他/她明确声明要自愿恢复日本国籍。
日本国籍法第14条明确规定:
日本人在20岁前获得外国国籍者,要在22岁前选择保留其中之一。选择日本国籍可通过两种方式:或者剥夺他的外国国籍(by depriving himself or herself of the foreign nationality), 或者本人宣誓选择日本国籍并同时放弃外国国籍。