Remove all elements from TreeSet in Java

  /*from www .ja  v  a 2  s .c  o m*/

       
import java.util.TreeSet;

public class Main {
  public static void main(String[] args) {
    TreeSet<Integer> tSet = new TreeSet<Integer>();

    tSet.add(new Integer("1"));
    tSet.add(new Integer("2"));
    tSet.add(new Integer("3"));

    System.out.println("TreeSet before removal : " + tSet);
    tSet.clear();
    System.out.println("TreeSet after removal : " + tSet);
    System.out.println("Is TreeSet empty ? " + tSet.isEmpty());
  }
}