feat: Count strings in 2D array that contain the letter 'a'

🧠 Logic:
- Define a static method `count` that accepts a 2D array of strings.
- Use nested loops to iterate through all elements in the array.
- For each string, use `indexOf("a")` to check if it contains the character 'a'.
- If found, increment the `count`.
- In `main`, define a 2D string array `items`, call `count`, and print the total number of strings that contain 'a'.

Signed-off-by: Somesh diwan <[email protected]>

Author: Someshdiwan

Section8LoopAB/Loop 2.O/src/CountingError.java

@@ -1,18 +1,35 @@
-public class CountingError
-{
+public class CountingError {
     public static int count(String[][] things)
+        /*
+        static method named count that, Returns an int (the count), Takes a 2D array of strings (String[][] things) as input
+        */
     {
-        int count = 0;
-        for (int r = 0; r < things.length; r++)
-        {
-            for (int c = 0; c < things[r].length - 1; c++)
-            {
-                if (things[r][c].indexOf("a") >= 0)
-                {
+        int count = 0; //keep track of how many strings in the array contain the letter 'a'
+
+        //r represents the row index.
+        //things.length gives the total number of rows in the 2D array.
+        for (int r = 0; r < things.length; r++) {
+            /*
+            c is the column index.
+            things[r].length gives the number of columns in the r-th row.
+            It ensures we visit every element in the 2D array.
+            */
+            for (int c = 0; c < things[r].length; c++) {
+                if (things[r][c].indexOf("a") >= 0) {
                     count++;
                 }
             }
         }
         return count;
     }
+
+        public static void main (String[]args) {
+            String[][] items = {
+                    {"apple", "banana", "cherry"},
+                    {"dog", "cat", "rat"},
+                    {"hat", "bat", "mat"}
+            };
+            int result = count(items);
+            System.out.println("Count of strings containing 'a': " + result);
+        }
 }