【Java每日一题】20161108

20161107问题解析请点击今日问题下方的“【Java每日一题】20161108”查看

package Nov2016;

import java.util.TreeSet;

public class Ques1108 {
    public static void main(String[] args){

        Animal dog = new Animal("dog");
        Animal cat = new Animal("cat");

        TreeSet<Animal> animals = new TreeSet<Animal>();
        animals.add(dog);
        animals.add(cat);

        System.out.println(animals);  // 1
    }
}

// 动物类
class Animal implements Comparable<Animal>{
    private String name;

    Animal(String name){
        this.name = name;
    }

    @Override
    public int compareTo(Animal o){
        return 0;
    }

    @Override
    public String toString(){
        return name;
    }
}

今日问题：
请问注释1处输出结果是什么？（点击以下“【Java每日一题】20161108”查看20161107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=2650163239&idx=1&sn=f9072c6024605f48a61e0967b6f389da&chksm=f3c1de80c4b657967f19adeb8913b23039ad9f13b25e1145cba8a43ebb0457ea02927e0d1b60#rd]【Java每日一题】20161108[/url]，[url=http://www.jianshu.com/p/fcdc6a1bf174]【Java每日一题】20161108[/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]