public class Student implements Comparable<Student> {
  
  public String name;
  public int ID;
  
  public Student( int id, String n) {
      ID = id;
      name = n;
  }
  
  public int compareTo(Student other) {
    return this.ID - other.ID ;
    //return this.name.compareTo(other.name);
  }
  
}


public class StudentSortByName implements Comparator<Student> {
  
  public int compare(Student o1, Student o2) {
    return o1.name.compareTo(o2.name); 
  }
  
}