import java.util.*;

public class StudentSortedSet {
   
  public static void main(String[] args) {
    
    SortedSet<Student> students = new TreeSet<Student>();
    students.add(new Student("John", "Smith"));
    students.add(new Student("Stanley", "Peters"));
    students.add(new Student("Edgar", "Bloch"));
    students.add(new Student("Suzan", "Miles"));
    students.add(new Student("Mary", "Poppins"));
    students.add(new Student("Tom", "Rich"));
    for(Student n: students)
      System.out.println(n);
      
    System.out.println("\n***Print headset***");
      
    SortedSet<Student> subStudents = students.headSet(new Student("Mary", "Poppins"));
    for(Student s: subStudents)
      System.out.println(s);
      
    System.out.println("\n***Print tailset***");
      
    subStudents = students.tailSet(new Student("Mary", "Poppins"));
    for(Student s: subStudents)
      System.out.println(s);
  }
}