Added 2D_ArrayList.java

Java/2D_ArrayList.java

@@ -0,0 +1,36 @@
+import java.io.*;
+import java.math.*;
+import java.security.*;
+import java.text.*;
+import java.util.*;
+import java.util.concurrent.*;
+import java.util.regex.*;
+
+public class Solution {
+    public static void main(String[] args) throws IOException {
+        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
+        List<List<Integer>> arr = new ArrayList<>();                                                   //Creating 2D ArrayList
+        for (int i = 0; i < 6; i++) {
+            String[] arrRowTempItems = bufferedReader.readLine().replaceAll("\\s+$", "").split(" ");
+            List<Integer> arrRowItems = new ArrayList<>();
+            for (int j = 0; j < 6; j++) {
+                int arrItem = Integer.parseInt(arrRowTempItems[j]);
+                arrRowItems.add(arrItem);
+            }
+            arr.add(arrRowItems);                                         //Adding elements in an arraylist
+        }
+
+        bufferedReader.close();
+
+        int count=-99;
+        for(int i=0;i<4;i++){
+            for(int j=0;j<4;j++){
+                int num = ((arr.get(i).get(j))+(arr.get(i).get(j+1))+(arr.get(i).get(j+2))+(arr.get(i+1).get(j+1))+(arr.get(i+2).get(j))+(arr.get(i+2).get(j+1))+(arr.get(i+2).get(j+2)));                                         //Obtaining the sum of an hourglass in a 2D ArrayList
+                if(num>=count){                                         //Checking sum of an hourglass is greater than count or not
+                    count = num;                                        //If greater, then value of count becomes equal to an hourglass
+                }
+            }
+        }
+        System.out.println(count);                                     //Printing maximum sum of an hourglass possible in a given 2D ArrayList
+    }
+}