【Java每日一题】20161018

20161017问题解析请点击今日问题下方的“【Java每日一题】20161018”查看

package Oct2016;  

public class Ques1018 {  

    public static void main(String[] args){  
        Obj obj01 = new Obj("18");  
        Obj obj02 = new Obj("19");  
        obj01.printAge(obj02);  
    }  
}  

class Obj{  
    private String age;   

    public Obj(String age){  
        this.age = age;  
    }  

    public void printAge(Obj obj){  
        String age = obj.age;   
        System.out.println("年龄是：" + age);  
    }  
} 

今日问题：
请问主程序输出结果是什么？（点击以下“【Java每日一题】20161018”查看20161017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=2650163207&idx=1&sn=db385d6f88eb7b339d78e6a4e6b83dbd&chksm=f3c1dea0c4b657b66cf0e557df39f106ce444ba542c6aabfeb78f3ab3b8c3044cbca948c1d87&scene=0#wechat_redirect]【Java每日一题】20161018[/url]，[url=http://www.jianshu.com/p/c58559f673aa]【Java每日一题】20161018[/url]
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[img]https://img-blog.youkuaiyun.com/20161017115128961?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast[/img]