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（问题解析在公众号首发，公众号ID：weknow619）

List list = new List;
System.out.println(list instanceof List); 


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 animals = new TreeSet();
        animals.add(dog);
        animals.add(cat);
        
        System.out.println(animals);  // 1
    }
}
    
// 动物类
class Animal implements Comparable{
    
    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）