Unlucky Cheaters

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class cheaters {

    static class Person implements Comparable<Person> {
        public String name;
        public double val;
        public double grade;

        Person(String n, double v, double g) {
            name = n;
            val = v;
            grade = g;
        }

        @Override
        public int compareTo(Person arg0) {
            if (val < arg0.val)
                return 1;
            else if (val > arg0.val)
                return -1;
            else
                return 0;
        }

        public String toString() {
            return name + ": " + val + ", " + grade;
        }
    }

    public static void main(String[] args) throws FileNotFoundException {
        Scanner s = new Scanner(new File("/studentdata.dat"));
        String key1 = s.nextLine();
        String key2 = s.nextLine();

        int max = 0;
        ArrayList<Person> people = new ArrayList<Person>();
        for (int i = 0; i < 10000; i++) {
            char test = s.next().trim().charAt(0);
            String name = s.next().trim() + " " + s.next().trim();
            name = name.substring(0, name.length() - 1);

            double score = s.nextDouble();

            String answers = s.nextLine().trim();

            double num = 0;
            double den = 0;

            for (int j = 0; j < 200; j++) {
                if (test == 'A') {
                    if (answers.charAt(j) != key1.charAt(j)) {
                        den++;
                        if (answers.charAt(j) == key2.charAt(j)) {
                            num++;
                        }
                    }
                }
                if (i % 2 == 1) {
                    if (answers.charAt(j) != key2.charAt(j)) {
                        den++;
                        if (answers.charAt(j) == key1.charAt(j)) {
                            num++;
                        }
                    }
                }
            }

            people.add(new Person(name, num / den * 100.0, score));
        }

        ArrayList<String> cheaters = new ArrayList<String>();

        for (int i = 0; i < 10000; i++) {
            Person p = people.get(i);
            if (p.val >= 60.0 && p.grade <= 75.0) // Experimental, mess around with these until cheaters.size() == 5
                cheaters.add(p.name.split(" ")[1]);
        }

        Collections.sort(cheaters);

        String out = "";

        for (String c : cheaters)
            out += c + ","; // This only runs 5 times, don't worry

        out = out.substring(0, out.length() - 1);

        System.out.println(out);
    }
}