package com.student;import java.util.HashSet;import java.util.Set;public class Student {?? ??? ?public String id;?? ??? ?public String name;?? ??? ?public Set<Student>courses;?? ??? ?public studeng(String id,String name){?? ??? ??? ??? ?this.id=id;?? ??? ?this.name=name;?? ??? ?this.courses = new HashSet<Student>();?? ??? ??? ?}}