學(xué)生選課--判斷Set中課程是否存在章節(jié)舉例代碼的Course類(lèi)型不一致問(wèn)題，應(yīng)該用Set 類(lèi)型并用HashSet初始化才準(zhǔn)確吧？
public?Set<Course>?coursesToSelect; public?Student?student;
/**
?*?學(xué)生類(lèi)
?*?@author?Administrator
?*
?*/
public?class?Student?{
???public?String?id;
???
???public?String?name;
???
???public?Set<Course>?courses;
???public?Student(String?id,?String?name)?{
??????this.id?=?id;
??????this.name?=?name;
??????this.courses?=?new?HashSet<>();
???}
}
2019-06-27
2019-04-14
泛型里的Course類(lèi)沒(méi)加