Java 集合 使用索引替换Vector元素

import java.util.Vector;
public class ReplaceElements {
  public static void main(String[] args) {
     Vector<String> vector = new Vector<String>();
     vector.add("Harry");
     vector.add("Steve");
     vector.add("Vince");
     vector.add("David");
     vector.add("Matt");

     System.out.println("Vector elements before replacement: ");
     for(int i=0; i < vector.size(); i++)
     {
         System.out.println(vector.get(i));
     }

     //Replacing index 1 element
     vector.set(1,"Mark");
     //Replacing index 2 element
     vector.set(2,"Jack");

     System.out.println("Vector elements after replacement: ");
     for(int i=0; i < vector.size(); i++)
     {
        System.out.println(vector.get(i));
     }
  }
}

Vector elements before replacement: 
Harry
Steve
Vince
David
Matt
Vector elements after replacement: 
Harry
Mark
Jack
David
Matt