#Student Class

package edu.myuni1001;


public class Student implements Comparable {

    private String name;

    public Student(String name) {

        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public int compareTo(Object o) {
        return this.name.compareTo(((Student)o).getName());
    }


}


#Main Class

package edu.myuni1001;

import java.util.*;

public class Main {

    public static void main(String[] args) {

     Set<Student> students = new TreeSet<>();

     Student tim = new Student("Tim");

     Student david =  new Student("David");

     Student mary =  new Student("Mary");

     students.add(tim);

     students.add(david);

     students.add(mary);

     for (Student student: students){
         System.out.println(student.getName());
     }

    }
}