新版jdk的peek坑

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

class Scratch {
    public static void main(String[] args) {
        List<Integer> list = Arrays.asList(1, 2, 3, 4);
        long count = list.stream().peek(System.out::println).count();
        System.out.println(count);
    }
}