Create Maximum sum of hour glass

Maximum sum of hour glass

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+//Maximum sum of hour glass
+
+import java.io.*;
+import java.util.*;
+
+class GFG {
+    public static void main(String args[]) throws IOException {
+        BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
+        int t = Integer.parseInt(read.readLine());
+
+        while(t-- > 0) {
+            String s[] = read.readLine().split(" ");
+            int N = Integer.parseInt(s[0]);
+            int M = Integer.parseInt(s[1]);
+            int Mat[][] = new int[N][M];
+
+            for(int i = 0; i < N; i++) {
+                String S[] = read.readLine().split(" ");
+
+                for(int j = 0; j < M; j++) {
+                    Mat[i][j] = Integer.parseInt(S[j]);
+                }
+            }
+            Solution ob = new Solution();
+            System.out.println(ob.findMaxSum(N, M, Mat));
+        }
+    }
+}
+
+class Solution {
+    int findMaxSum(int n, int m, int mat[][]) {
+        if(n < 3 || m < 3) {
+            return -1;
+        }
+
+        int ans = Integer.MIN_VALUE;
+
+        for(int i = 2; i < n; i++) {
+            int sum = 0;
+
+            for(int j = 1; j < m - 1; j++) {
+                sum = mat[i][j - 1] + mat[i - 2][j - 1] + mat[i - 1][j] + mat[i][j] + mat[i - 2][j]
+                    + mat[i][j + 1] + mat[i - 2][j + 1];
+                ans = Math.max(ans, sum);
+            }
+        }
+
+        return ans;
+    }
+};