Program to find sum of even number without sum method?

There are following way to find sum of even number without sum method.

Using reduce() method :-

First convert Arrays to list using Arrays.asList method
Now get the Stream data from List using arrayList.stream() method
From filter we find the even number which number divided by 2.
In reduce operation first argument to the operator is the return value of the previous application and second argument is the current stream element.
Print the value in double type.

syntax :- T reduce(T identity, BinaryOperator<T> accumulator);

				
					import java.util.Arrays;
import java.util.List;

public class ListQ {
	public static void main(String[] args) {

		List<Integer> f = Arrays.asList(1, 2, 3, 4, 5, 6, 1, 2, 3);
		Double r = f.stream().filter(i -> i % 2 == 0).reduce(0, (a, b) -> a + b).doubleValue();
		System.out.println("sum of even number without sum method :- "+r);
	}
}

Output :-
sum of even number without sum method :- 14.0