getfaces.java

public static ArrayList<Float> final_faces_array(float percent, float[] arr, float comparable_percent) {
        float len = arr.length; //length of array
        float min_no = (percent / 100)  *len; //number of faces wanted
        float last_face = 0;
        float secondlast_face = 0;

        //maintain an arraylist because if we keep an array we would have to initialize it with the size which can be max = len, but in case
        //the number of elements are less then array space is wasted.
        ArrayList<Float> faceslist = new ArrayList<>();
        for (int i = 0; i < min_no; i++)
            faceslist.add(arr[i]);

        if (faceslist.size() != 0) {
            last_face = faceslist.get(faceslist.size() - 1);
        }
        if (faceslist.size() - 2 >= 0) {
            secondlast_face = faceslist.get(faceslist.size() - 2);
        }

        //checking whether the last element is comparable with the second last element
        if (secondlast_face != 0 && last_face != 0) {
            boolean isComparable = check_comparable(last_face, secondlast_face, comparable_percent);
            if (!isComparable) {
                faceslist.remove(faceslist.size() - 1);
                return faceslist;
            }
        }
        for (float i = min_no; i < len; i++) {
            if (last_face != 0) {
                float next_face = arr[(int)i];
                if (check_comparable(next_face, last_face, comparable_percent)) {
                    faceslist.add(next_face);
                }
            } else
                break;
        }
        return faceslist;
    }

    private static boolean check_comparable(float last_face, float secondlast_face, float comparable_percent) {
        if (last_face / secondlast_face <= comparable_percent)
            return true;
        return false;
    }