list method

package Collection_List;

import java.util.*;

public class collection_list  {
   public static void main(String[]args){
       List<String> list=new ArrayList<>();
       list.add("a");
       list.add("b");
       list.add("c");
       list.add("d");
       list.add(3,"Alex");
       System.out.println(list.get(3));
       System.out.println(list.remove(2));
       System.out.println(list.set(1,"Jeff"));
       System.out.println(list.toString());
   }
}