import java.util.Comparator;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class StudentSorter {
    public static void main(String[] args) {
        List<Student> list = Arrays.asList(
                                 new Student("Minnie", "Mouse"),
                                 new Student("Mickey", "Gouse"),
                                 new Student("Marry",  "Poppins"),
                                 new Student("Peter",  "Pan")
                                 );
         System.out.println(list);
         Collections.sort(list, (a,b) -> a.getLastName().compareTo(b.getLastName()) );
         System.out.println(list);
    }
}