private?Set<Courses>?courses;	
public?Set<Courses>?getCourses()?{
	return?courses;	
}	
public?void?setCourses(Set<Courses>?courses)?{
	this.courses?=?courses;	
}			//利用foreach遍歷student中選擇的課程	
public?void?travelStudent(Students?student)?{
	for(Courses?course:student.getCourses())?{
		System.out.println("course:"+course.getId()+"?,?"+course.getName());		
	}	
}			

構(gòu)造Student類的時(shí)候，需要進(jìn)行泛型

private?Set<Courses>?courses;	public?Set<Courses>?getCourses()?{		return?courses;	}	public?void?setCourses(Set<Courses>?courses)?{		this.courses?=?courses;	}			//利用foreach遍歷student中選擇的課程	public?void?travelStudent(Students?student)?{		for(Courses?course:student.getCourses())?{			System.out.println("course:"+course.getId()+"?,?"+course.getName());		}	}			//用于創(chuàng)建新的學(xué)生	public?Students(String?id,String?name)?{		this.id?=?id;		this.name?=?name;		this.courses?=?new?HashSet();//位于util.HashSet類中，是Set接口下的一個(gè)重要類		?????????????????????????????//對(duì)courses進(jìn)行實(shí)例化	}

沒(méi)泛型

沒(méi)有導(dǎo)包