Example: SumArrayStreamReduce in Java

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

public class Main {
    public static void main(String[] args) {
        // Step 1: Define the array of numbers
        int[] numbers = {10, 20, 30, 40, 50};

        // Step 2: Convert the int array to an IntStream and reduce it to a sum
        // The first argument (0) is the initial identity value for the sum.
        // The second argument (Integer::sum) is a method reference to the addition operation.
        int sum = Arrays.stream(numbers).reduce(0, Integer::sum);
        
        // Step 3: Print the calculated sum
        System.out.println("Sum using Stream.reduce() with method reference: " + sum);

        // Alternatively, using a lambda expression:
        int sumLambda = Arrays.stream(numbers).reduce(0, (a, b) -> a + b);
        System.out.println("Sum using Stream.reduce() with lambda: " + sumLambda);
    }
}