ArrayListClient.java

import java.util.ArrayList;
import java.util.TreeSet;

public class ArrayListClient {
    // Set<String> set = new TreeSet<>();
    public static void main(String[] args) {
        IList<String> list = new OurArrayList<>();
        for (int i = 0; i < 19; i++) {
            list.add("" + i + "!");
        }
        System.out.println(list);

        /*
        for (String s : list) {

        }
         */

        /*
        int[] =======>   [int][int][int].....
        Object[] ====>   [ | ][ | ][ | ]
                           v    v    v

         */
    }
}