Collections Data Structure Java

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import java.util.Collections;
import java.util.Comparator;
import java.util.Vector;
public class Main {
  public static void main(String[] args) {
    Vector v = new Vector();
    v.add("1");
    v.add("2");
    v.add("3");
    v.add("4");
    v.add("5");
    Comparator comparator = Collections.reverseOrder();
    System.out.println(v);
    Collections.sort(v, comparator);
    System.out.println(v);
  }
}