Java 向量Vector 反转

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

public class Main {
   public static void main(String[] args) {
      Vector<String> v = new Vector<String>();
      v.add("1");
      v.add("2");
      v.add("3");
      v.add("4");
      v.add("5");
      System.out.println(v);
      Collections.swap(v, 0, 4);
      System.out.println("After swapping");
      System.out.println(v);
   }
}