Java 集合 将HashSet转换为List/ArrayList

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

     //add elements to HashSet
     hset.add("Steve");
     hset.add("Matt");
     hset.add("Govinda");
     hset.add("John");
     hset.add("Tommy");

     // Displaying HashSet elements
     System.out.println("HashSet contains: "+ hset);

     // Creating a List of HashSet elements
     List<String> list = new ArrayList<String>(hset);

     // Displaying ArrayList elements
     System.out.println("ArrayList contains: "+ list);
  }
}

HashSet contains: [Tommy, Matt, Steve, Govinda, John]
ArrayList contains: [Tommy, Matt, Steve, Govinda, John]