Initializing a 2D Array and Printing its Elements:

public class TwoDArrayExample1 {
    public static void main(String[] args) {
        // Initialize a 2D array
        int[][] matrix = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };

        // Print the elements of the 2D array
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
}

Calculating the Sum of Elements in a 2D Array:

public class TwoDArrayExample2 {
    public static void main(String[] args) {
        // Initialize a 2D array
        int[][] matrix = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };

        // Calculate the sum of elements in the 2D array
        int sum = 0;
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                sum += matrix[i][j];
            }
        }

        // Print the sum
        System.out.println("Sum of elements: " + sum);
    }
}

Finding the Maximum Element in a 2D Array:

public class TwoDArrayExample3 {
    public static void main(String[] args) {
        // Initialize a 2D array
        int[][] matrix = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };

        // Find the maximum element in the 2D array
        int max = matrix[0][0];
        for (int i = 0; i < matrix.length; i++) {
            for (int j = 0; j < matrix[i].length; j++) {
                if (matrix[i][j] > max) {
                    max = matrix[i][j];
                }
            }
        }

        // Print the maximum element
        System.out.println("Maximum element: " + max);
    }
}