Collections的swap和sort用法

package netty;



import java.util.*;

public class CollectionTest {
   public static void main(String[] args) {
      // create vector object 
      Vector<String> vector = new Vector<String>();
      
      // populate the vector
      vector.add("1");
      vector.add("2");
      vector.add("3");
      vector.add("4");
      vector.add("5");

      System.out.println("Before swap: "+vector);
      
      // swap the elements
      Collections.swap(vector, 0, 4);
      
      System.out.println("After swap: "+vector);
      Collections.sort(vector);
      System.out.println("After sort: "+vector);
   }
}