Exam 3. Exam Score

import java.util.Scanner;
import java.util.TreeMap;

public class _3_ExamScore {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        scan.nextLine();
        scan.nextLine();
        scan.nextLine();

        TreeMap<Integer, TreeMap<String, Double>> examScores = new TreeMap<>();
        String inputLine = scan.nextLine();
        String[] inputs;
        String studentNames;
        int score;
        double grade;
        do {
            inputs = inputLine.split("[^A-Za-z0-9.]+");
            score = Integer.parseInt(inputs[3]);
            studentNames = String.format("%s %s", inputs[1], inputs[2]);
            grade = Double.parseDouble(inputs[4]);

            TreeMap<String, Double> studentsMap = examScores.get(score);
            if (!examScores.containsKey(score)) {
                studentsMap = new TreeMap<>();
            }

            studentsMap.put(studentNames, grade);
            examScores.put(score, studentsMap);

            inputLine = scan.nextLine();
        } while (!inputLine.contains("--"));

        for (int key : examScores.keySet()) {
            System.out.printf("%d -> [", key);
            TreeMap<String, Double> students = examScores.get(key);
            double sumGrades = 0;
            boolean isFirst = true;
            for (String student : students.keySet()) {
                if (!isFirst) {
                    System.out.print(", ");
                }
                isFirst = false;
                System.out.print(student);
                sumGrades += students.get(student);
            }

            double avg = sumGrades / students.size();
            System.out.printf("]; avg=%.2f%n", avg);
        }
    }

}