Example: SumElementsNestedForLoop in Java

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// SumElementsNestedForLoop
public class Main {
    public static void main(String[] args) {
        // Step 1: Define the 2D array
        int[][] matrix = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };

        // Step 2: Initialize a variable to store the sum
        int sum = 0;

        // Step 3: Iterate through each row of the 2D array
        for (int i = 0; i < matrix.length; i++) {
            // Step 4: Iterate through each element in the current row
            for (int j = 0; j < matrix[i].length; j++) {
                // Step 5: Add the current element to the sum
                sum += matrix[i][j];
            }
        }

        // Step 6: Print the total sum
        System.out.println("Sum of all elements (Nested For Loop): " + sum);
    }
}