Dart编程实例 - HashSet

import 'dart:collection'; 

void main() { 

   Set numberSet = new  HashSet(); 

   numberSet.add(100); 

   numberSet.add(20); 

   numberSet.add(5); 

   numberSet.add(60); 

   numberSet.add(70); 

   print("Default implementation :${numberSet.runtimeType}"); 

   for(var no in numberSet){ 

      print(no); 

   }

}