二维数组排序程序添加功能

protected PointScanner(String inputFileName, Algorithm algo) throws FileNotFoundException, InputMismatchException
    {
        Scanner scnr = new Scanner(new File(inputFileName));
        ArrayList<Integer> apts = new ArrayList<Integer>();
        while(scnr.hasNextInt()) {
            apts.add(scnr.nextInt());
        }
        scnr.close();
        if (apts.size() % 2 != 0) throw new InputMismatchException();
        points = new Point[apts.size() / 2];
        int i;
        int x = 0;
        int y = 1;
        for(i = 0; i < points.length; i++) {
            points[i] = new Point(apts.get(x), apts.get(y));
            x = x + 2;
            y = x + 1;
        }
        sortingAlgorithm = algo;
    }