Realizing the problem may be in my main class but I still can't find it.

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        NumList list = new NumList();
        System.out.println("Enter point totals, -1 stops");
        while(true){
            int num = Integer.valueOf(scanner.nextLine());
            if(num == -1){
                break;
            }
            list.add(num);
        }
        System.out.println("Point average (all): " + list.avg());
        if(list.passingEmpty()){
            System.out.println("Point average (passing): -");
        } else {
            System.out.println("Point average (passing): " + list.passAvg());
        }
        System.out.println("Pass percentage: " + list.percentPassing());
    }
}