import java.util.*;

public class HelloWorldSet {
  public static void main(String[] args) {
    try {
      // HashSet
      Set hashSet = new HashSet();
      addData(hashSet);
      System.out.println("HashSet : " + hashSet);

      // TreeSet
      Set treeSet = new TreeSet();
      addData(treeSet);
      System.out.println("TreeSet : " + treeSet);

      // LinkedHashSet
      Set linkedHashSet = new LinkedHashSet();
      addData(linkedHashSet);
      System.out.println("LinkedHashSet : " + linkedHashSet);

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  static void addData(Set set) {
    for (int i = 10;i >= 1;i--) {
      set.add(new Integer(i));
    }
  }
}