Java 集合 HashSet和TreeSet的区别

import java.util.HashSet;
class HashSetDemo{ 
  public static void main(String[] args) {
     // Create a HashSet
     HashSet<String> hset = new HashSet<String>();

     //add elements to HashSet
     hset.add("Abhijeet");
     hset.add("Ram");
     hset.add("Kevin");
     hset.add("Singh");
     hset.add("Rick");
     // Duplicate removed
     hset.add("Ram"); 

     // Displaying HashSet elements
     System.out.println("HashSet contains: ");
     for(String temp : hset){
        System.out.println(temp);
     }
  }
}

HashSet contains: 
Rick
Singh
Ram
Kevin
Abhijeet

import java.util.TreeSet;
class TreeSetDemo{ 
  public static void main(String[] args) {
     // Create a TreeSet
     TreeSet<String> tset = new TreeSet<String>();

     //add elements to TreeSet
     tset.add("Abhijeet");
     tset.add("Ram");
     tset.add("Kevin");
     tset.add("Singh");
     tset.add("Rick");
     // Duplicate removed
     tset.add("Ram"); 

     // Displaying TreeSet elements
     System.out.println("TreeSet contains: ");
     for(String temp : tset){
        System.out.println(temp);
     }
  }
}

TreeSet contains: 
Abhijeet
Kevin
Ram
Rick
Singh