For better performance, you could have used an IntStream in this example.
import java.util.Arrays; import java.util.List; public class Main { public static void main(String[] args) { // Get a list of integers from 1 to 5 List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5); // Compute the sum of the squares of all odd integers in the list int sum = numbers.stream().filter(n -> n % 2 == 1).map(n -> n * n) .reduce(0, Integer::sum); System.out.println("Sum = " + sum); }/* www . ja va 2s . c om*/ }