Advent of Code Day 1

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



public class D1 {
    public ArrayList<Integer> parseInput(String filename) {
        ArrayList<Integer> inputs = new ArrayList<Integer>();
        File f = new File(filename);
        try (Scanner scan = new Scanner(f)) {
            while (scan.hasNextInt()) {
                inputs.add(new Integer(scan.nextInt()));
            }
        } catch (FileNotFoundException e) {
        }
        return inputs;
    }

    public int getProduct(ArrayList<Integer> inputs) {
        // NEW VERSION FROM REDDIT https://www.reddit.com/r/adventofcode/comments/k4e4lm/2020_day_1_solutions/ge93rku/
        int start = 0;
        int end = inputs.size() - 1;
        Collections.sort(inputs);
        int sum = inputs.get(start).intValue() + inputs.get(end).intValue();
        while (sum != 2020) {
            if (sum > 2020) {
                end--;
            } else {
                start++;
            }
            sum = inputs.get(start).intValue() + inputs.get(end).intValue();
            if (start > end) {
                break;
            }
        }
        int total = inputs.get(start).intValue() * inputs.get(end).intValue();
        return total;

        //
        // ORIGINAL VERSION
        //
        // ArrayList<Integer> reversedInputs = new ArrayList<Integer>(inputs);
        // Collections.reverse(reversedInputs);
        // for (Integer start : inputs) {
        //     for (Integer end : reversedInputs) {
        //         if (start.intValue() + end.intValue() == goal) {
        //             total = start.intValue() * end.intValue();
        //             return total;
        //         }
        //     }
        // }
        // return total;
    }

    public static void main(String[] args) {
        final long startTime = System.nanoTime();
        D1 dayOne = new D1();
        ArrayList<Integer> inputs = dayOne.parseInput("input.txt");
        int total = dayOne.getProduct(inputs);
        System.out.println(total);
        final long duration = System.nanoTime() - startTime;
        System.out.println(duration / 1000000000);
    }
}