Example: Sum of Squares - Java Stream API in Java

// Sum of Squares - Java Stream API
import java.util.Arrays;
import java.util.stream.IntStream; // Specific for primitive int streams

public class Main {
    public static void main(String[] args) {
        // Step 1: Define the input array
        int[] numbers = {1, 2, 3, 4, 5};
        
        // Step 2: Convert the array to an IntStream
        // IntStream is optimized for primitive int operations
        IntStream intStream = Arrays.stream(numbers);
        
        // Step 3: Map each element to its square using a lambda expression
        // Then, sum all the squared elements
        long sumOfSquares = intStream
                            .map(n -> n * n) // Square each number
                            .sum();          // Sum the results
        
        // Step 4: Print the result
        System.out.println("Array elements: [1, 2, 3, 4, 5]");
        System.out.println("Sum of squares (Stream API): " + sumOfSquares);
        
        // Example with a Double array for broader application
        double[] doubleNumbers = {1.5, 2.0, 2.5};
        double sumOfSquaresDouble = Arrays.stream(doubleNumbers)
                                      .map(d -> d * d)
                                      .sum();
        System.out.println("Double array elements: [1.5, 2.0, 2.5]");
        System.out.println("Sum of squares (Stream API - Double): " + sumOfSquaresDouble);
    }
}