The use of Data Structures in Java -- ArrayLists

package com.gea.boe.bean;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;

public class BoeMain
{
    public static void main(String[] args)
    {
        ArrayList<String> myList = new ArrayList<String>();
        myList.add("item1");
        myList.add("item2");
        myList.add("item3");
        myList.add("item4");
        // Display
        display(myList);
        // Remove
        addAndRemoveFromArrayList(myList, 1, "REMOVE");
        // Display
        display(myList);
        // Add
        addAndRemoveFromArrayList(myList, 1, "ADD");
        // Display
        display(myList);
        // Sorting
        sortingArrayList(myList);
        // Display
        display(myList);
        //Searching
        searchingFromArrayList(myList,"item4");
       
    }
    // Remove items from Array List
    public static void addAndRemoveFromArrayList(ArrayList<String> arrayList, int indexOfItemToRemove, String addRemove)
    {
        if ("ADD".equalsIgnoreCase(addRemove))
        {
            String addItem = "item9";
            arrayList.add(indexOfItemToRemove, addItem);
        }
        else if ("REMOVE".equalsIgnoreCase(addRemove))
        {
            arrayList.remove(indexOfItemToRemove);
        }
    }
    // Here is the list, output methods
    public static void display(ArrayList<String> arrayList)
    {
        System.out.println("There are (" + arrayList.size() + ") items in the list.");
        // output method 1
        for (int i = 0; i < arrayList.size(); i++)
        {
            System.out.println(i + " -->> " + arrayList.get(i));
        }
        // output method 2
        for (Iterator<String> iter = arrayList.iterator(); iter.hasNext();)
        {
            System.out.println("-->> " + iter.next());
        }
        // output method 3
        System.out.println(arrayList);
    }
    // Sorting Array List
    public static void sortingArrayList(ArrayList<String> arrayList)
    {
        Collections.sort(arrayList);
    }
    //Searching
    public static void searchingFromArrayList(ArrayList<String> arrayList,String searchItem)
    {
        boolean searchResult = arrayList.contains(searchItem);
       
        if(searchResult == true)
            System.out.println("Item found at position " + arrayList.indexOf(searchItem));
        else
            System.out.println("Item NOT found");
    }
}