Java 向量Vector 反转2

import java.util.Vector;
import java.util.Collections;

public class Demo {
   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");
      Collections.swap(v,0,4);
      System.out.println("Result after swap Vector contains : " + v);
   }
}