Example: SumElementsJavaStreams in Java

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// SumElementsJavaStreams
import java.util.Arrays; // Required for Arrays.stream()

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: Use streams to flatten and sum the elements
        int sum = Arrays.stream(matrix) // Stream<int[]> for each row
                        .flatMapToInt(Arrays::stream) // Flat map each int[] to an IntStream
                        .sum(); // Sum all elements in the IntStream

        // Step 3: Print the total sum
        System.out.println("Sum of all elements (Java Streams): " + sum);
    }
}