Java代码如何将流中所有整数求和呢？

Stream求和的实现思路：
      1.将Stream转换为IntStream
	  2.使用stream对象的sum方法,即可对流中所有元素求和,并返回求和值
如:
 int sum = integers.stream().mapToInt(Integer::intValue).sum();
 int sum = integers.stream().mapToInt(x -> x).sum();  

package com.java265.concurrency;
import java.util.Arrays;
import java.util.list;
import java.util.stream.Stream;
public class Java8Stream {
    public static void main(String[] args) {
        List<Integer> integers = Arrays.asList(88,99,110,2300);
        int sum = integers.stream().mapToInt(Integer::intValue).sum();
        System.out.println("Total : " + sum);
 
        Stream<Integer> integers2 = Stream.iterate(1, n -> n + 1).limit(10);
        IntStream intStream = integers2.mapToInt(x -> x);
        int sum1 = intStream.sum();
        System.out.println("求和值: " + sum1);
    }
}