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);
}
}