Check If Given Four Points Form a Square

This Solution Is in Java



// User function Template for Javaclass Solution {
class Solution {
    int distance(int a, int b, int p, int q){
        return (p - a) * (p - a) + (q - b) * (q - b);
    }
    int fourPointSquare(int points[][]){
        for (int i = 0; i < 4; i++){
            for (int j = i + 1; j < 4; j++){
                if (points[i][0] == points[j][0] && points[i][1] == points[j][1]){
                    return 0;
                }
            }
        }
        int d2 = distance(points[0][0], points[0][1], points[1][0], points[1][1]);
        int d3 = distance(points[0][0], points[0][1], points[2][0], points[2][1]);
        int d4 = distance(points[0][0], points[0][1], points[3][0], points[3][1]);
        if(d2 == d3 && 2 * d2 == d4){
            int d = distance(points[1][0], points[1][1], points[3][0],points[3][1]);
            return ((d == distance(points[2][0], points[2][1], points[3][0],points[3][1]) && d == d2) ? 1: 0);
        }

        if(d3 == d4 && 2 * d3 == d2){
            int d = distance(points[1][0], points[1][1], points[2][0],points[2][1]);
            return ((d == distance(points[1][0], points[1][1], points[3][0],points[3][1]) && d == d3) ? 1: 0);
        }
        if(d2 == d4 && 2 * d2 == d3){
            int d = distance(points[1][0], points[1][1], points[2][0],points[2][1]);
            return ((d == distance(points[2][0], points[2][1], points[3][0],points[3][1]) && d == d2) ? 1: 0);
        }
        return 0;
    }
}