【Java每日一题】20161128

20161125问题解析请点击今日问题下方的“【Java每日一题】20161128”查看

package Nov2016;

import java.util.ArrayList;
import java.util.List;

public class Ques1128 {

    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>();
        list.add(1);
        list.add(2);
        list.add(3);
        list.add(null);
        System.out.println(sum(list));
    }

    public static int sum(List<Integer> list){
        int temp = 0;
        for(int i : list){
            temp += i;
        }
        return temp;
    }
}

今日问题：
请问主程序能否正常编译通过输出结果？（点击以下“【Java每日一题】20161125”查看20161124问题解析）

题目原发布于公众号、简书：[url=http://mp.weixin.qq.com/s?__biz=MzI4ODEyMTgwMA==&mid=2650163275&idx=1&sn=b17c6b12af658927b16ec2b3efe61036&chksm=f3c1deecc4b657fa2f00108f2d50a7bdb3a8e489f222263e0ef5dcf81c061640676c97dfec51#rd]【Java每日一题】20161128[/url]，[url=http://www.jianshu.com/p/ff204f2b1d1a]【Java每日一题】20161128[/url]

[img]https://img-blog.youkuaiyun.com/20161017115128961?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast[/img]