Last one before break from Prog exercises

Author: Decoretum

HackerRank/2dHourglass.java

@@ -0,0 +1,42 @@
+import java.io.*;
+import java.math.*;
+import java.security.*;
+import java.text.*;
+import java.util.*;
+import java.util.concurrent.*;
+import java.util.function.*;
+import java.util.regex.*;
+import java.util.stream.*;
+import static java.util.stream.Collectors.joining;
+import static java.util.stream.Collectors.toList;
+
+class Result {
+
+    /*
+     * Complete the 'hourglassSum' function below.
+     *
+     * The function is expected to return an INTEGER.
+     * The function accepts 2D_INTEGER_ARRAY arr as parameter.
+     */
+
+    public static int hourglassSum(List<List<Integer>> arr) {
+    ArrayList<Integer> Sums = new ArrayList<>();
+    int Sum = 0, i=0, j=0, k=0;
+    while (i < 4){
+        int babysum = 0;
+        babysum += (arr.get(i).get(j) + arr.get(i).get(j+1) + arr.get(i).get(j+2));   
+        babysum += arr.get(i+1).get(j+1);
+        babysum += (arr.get(i+2).get(j) + arr.get(i+2).get(j+1) + arr.get(i+2).get(j+2));
+        j++;
+        Sums.add(babysum);
+        
+        if (j == 4){
+            i++;
+            j=0;
+        }
+    }
+
+    return Collections.max(Sums);
+    }
+
+}