Streams :一次计算总和的差值

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

public class StreamExample {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(1, 3, 6, 10);

        int sumOfDifferences = numbers.stream()
                .reduce(0, (a, b) -> {
                    int diff = b - a;
                    return sumOfDifferences + diff;
                }, Integer::sum);

        System.out.println("Sum of differences: " + sumOfDifferences);
    }
}

int sumOfDifferences = numbers.stream()
        .reduce(0, (prev, curr) -> prev + (curr - prev), Integer::sum);

int sumOfDifferences = numbers.parallelStream()
        .reduce(0, (prev, curr) -> prev + (curr - prev), Integer::sum);