Example: Sum of Squares using Java 8 Streams (map and reduce) in Java

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// Sum of Squares using Java 8 Streams (map and reduce)
import java.util.Arrays;

public class Main {
    public static void main(String[] args) {
        // Step 1: Define the input array
        int[] numbers = {1, 2, 3, 4};

        // Step 2: Convert the array to an IntStream
        // Step 3: Use map to transform each element to its square
        // Step 4: Use reduce to sum all the squared elements
        int sumOfSquares = Arrays.stream(numbers)
                                 .map(n -> n * n) // Square each number
                                 .reduce(0, (a, b) -> a + b); // Sum them up starting from 0

        // Step 5: Print the result
        System.out.println("Array: " + Arrays.toString(numbers));
        System.out.println("Sum of squares (Stream API with map and reduce): " + sumOfSquares);
    }
}