given number of points(cordinates) , find max points lie on the same line ?

[Hayzam]

error while given the test case , it finds 1 point while there are only 2 lines , each one has 2 points

x [ 0 ] = 1 , y [ 0 ] = 5
x [ 1 ] = 5 , y [ 1 ] = 1
x [ 2 ] = 1 , y [ 2 ] = 1
x [ 3 ] = 5 , y [ 3 ] = 5

private static void solve_it(ArrayList<point> arr) {
        System.out.println(" new test case ");
        point p = new point();
        point pp = new point();
        point ppp = new point();
        int slope, slope2, x, y, count = 0;


        int[][] index = new int[arr.size()][arr.size()];

        for (int i = 0; i < arr.size(); i++) {
            count = 0;
            p = arr.get(i);
            System.out.println(" x [ " + i + " ] = " + p.x + " , y [ " + i + " ] = " + p.y);
            for (int j = 0; j < arr.size(); j++) {

                if (i == j) {
                    break;
                }
                pp = arr.get(j);

                if ((pp.y - p.y) == 0) {
                    slope = 0;
                } else {
                    slope = (pp.x - p.x) / (pp.y - p.y);
                }


                for (int l = 0; l < arr.size(); l++) {
                    if ((l == i) || (l == j)) {
                        break;
                    }
                    ppp = arr.get(l);

                    if ((ppp.y - p.y) == 0) {
                        slope2 = 0;
                    } else {
                        slope2 = (ppp.x - p.x) / (ppp.y - p.y);
                    }
                    if (slope == slope2) {
                        count++;
                    }
                }
                index[i][j] = count;

            }

        }

        for (int q = 0; q < index.length; q++) {
            System.out.println();
            for (int w = 0; w < index.length; w++) {
                System.out.print(" " + index[q][w]);
            }

        }

        arr.clear();

    }

[Norm]

If you are getting errors, copy and paste full text here.
What is your algorithm?
I see code but NO COMMENTs on how you are trying to solve the problem.

[fishtoprecords]

Two points define a line, you may accidentally have more than two points on a line, depending on the accuracy of your measurements.

But I don't see a question here.