HashSet会自动排序嘛??

import java.util.*;
class test{
public static void main(String args[]) {
     Set<String> set = new HashSet<String>();
     set.add("catepillar");
     set.add("momor");
     set.add("bush");
     set.add("cateprillar");

     for(String name:set){
     System.out.println (name + " ");
     }
    }
}
OUTPUT:
bush
catepillar
momor
cateprillar Set不是按按顺序输出嘛?为啥会自动排序?