Challenge #167 [Intermediate] Final Grades

CS101Class

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Scanner;


public class CS101Class {
	
	private class StudentComparator implements Comparator<Student> {
		
		@Override
		public int compare(Student o1, Student o2) {
			if(o1.getFinalGrade() > o2.getFinalGrade())	{
				return -1;
			}
			else if(o1.getFinalGrade() < o2.getFinalGrade()) {
				return 1;
			}
			
			return 0;
		}
	}
	
	private ArrayList<Student> mStudents;
	
	public CS101Class() {
		mStudents = new ArrayList<Student>();
	}
	
	public void addStudent(String firstName, String lastName, ArrayList<Integer> scores) {
		Student student = new Student(firstName, lastName, scores);
		
		setStudentGrade(student);
		
		mStudents.add(student);
	}
	
	private void setStudentGrade(Student student) {
		
		int finalScore = 0;
		for (Integer grade : student.getScores()) {
			finalScore += grade;
		}
		finalScore /= student.getScores().size();
		student.setFinalGrade(finalScore);
		
		String letterGrade = new String();
		switch(finalScore/10) {
			case 10:
			case 9:
				letterGrade = "A"; break;
			case 8:
				letterGrade = "B"; break;
			case 7:
				letterGrade = "C"; break;
			case 6:
				letterGrade = "D"; break;
			case 5:
			case 4:
			case 3:
			case 2:
			case 1:
			case 0:
				letterGrade = "F"; break;
		}
		if(!letterGrade.equals("A") && !letterGrade.equals("F")) {
			switch(finalScore%10) {
			case 10:
			case 9:
			case 8:
				letterGrade += "+"; break;
			case 3:
			case 2:
			case 1:
				letterGrade += "-"; break;
			}
		}
		student.setLetterGrade(letterGrade);
	}

	@Override
	public String toString() {
		String output = new String();
		
		Collections.sort(mStudents, new StudentComparator());
		
		for (Student student : mStudents) {
			output += student.toString() + "\n";
		}
		return output;
	}
	
	public static void main(String[] args) {
		CS101Class cs101Class = new CS101Class();
		
        try {
        	BufferedReader bufferedReader = new BufferedReader(new FileReader("student_scores.txt"));
            String line;
            
			while ((line = bufferedReader.readLine()) != null) {
			    Scanner scanner = new Scanner(line);
			    
			    String firstName = scanner.next();
			    String nextString = scanner.next();
			    while (!nextString.contains(",")) {
			    	firstName += " " + nextString;
			    	nextString = scanner.next();
			    }
			    firstName = firstName.replaceAll("[\\[\\],]", "");
			    
			    String lastName = nextString;
			    nextString = scanner.next();
			    while (!nextString.matches("\\d+")) {
			    	lastName += " " + nextString;
			        nextString = scanner.next();
			    }
			    lastName = lastName.replaceAll("[,]", "");
			    
			    ArrayList<Integer> scores = new ArrayList<Integer>();
			    scores.add(Integer.valueOf(nextString));
			    while (scanner.hasNext()) {
			    	scores.add(scanner.nextInt());
			    }
			    
			    cs101Class.addStudent(firstName, lastName, scores);
			}
			
			bufferedReader.close();
		} catch (NumberFormatException | IOException e) {
			e.printStackTrace();
		}
		
		System.out.println(cs101Class.toString());
	}
}

Student

import java.util.ArrayList;
import java.util.Collections;

public class Student {

	private final String FORMATED_STUDENT_STRING = "%-12s, %-12s (%2d%%) (%-2s):\t %s";

	private String mFirstName = null;
	private String mLastName = null;
	private ArrayList<Integer> mScores = null;
	private String mLetterGrade = null;
	private int mFinalGrade = 0;

	public Student(String firstName, String lastName, ArrayList<Integer> scores) {
		mFirstName = firstName;
		mLastName = lastName;

		mScores = scores;
		Collections.sort(mScores);
		Collections.reverse(mScores);
	}

	public int getFinalGrade() {
		return mFinalGrade;
	}

	public ArrayList<Integer> getScores() {
		return mScores;
	}
	
	public void setFinalGrade(int grade) {
		mFinalGrade = grade;
	}

	public void setLetterGrade(String letterGrade) {
		mLetterGrade = letterGrade;
	}

	@Override
	public String toString() {
		String scoresString = new String();
		
		for (Integer score : mScores) {
			scoresString += String.format("%3d ", score);
		}
		
		return String.format(FORMATED_STUDENT_STRING, mLastName, mFirstName, mFinalGrade, mLetterGrade, scoresString);
	}
}