How do I convert an array of strings into append-able list?

howmuch4aG :

I have parsed through a CSV file and stored it as an array of strings. I'd like to add an item to each sub-array if certain conditions have been met, as shown below. However, I am not able to use the .add() method and get a "Cannot resolve method" message in my IDE. To try to get around this, I attempted to create a new arraylist in which I placed the contents of the string array, but the problem persisted. How do I make it so that I can add an item to each sublist?

import java.util.List;
import java.util.ArrayList;


public class Application {
    /**
     * Main entry of the application.
     *
     * @param args This should be empty
     */
    public static void main(final String[] args) {
        String csvFile = "/IUCNListV2.csv";
        List<String[]> listAnimal =
        ReadCSV.readFileAndParseSkipFirstline(Application.class.getResourceAsStream(csvFile));


        List<String[]> list2 = new ArrayList<>();
        for (String [] text : listAnimal) {
            list2.add(text);
        }
        
        for(String[] subList: list2)
            if (null != subList && subList[4].equals("x") &&
                    subList[5].equals("y")) {
                subList.add("z");
            }
    }
}

User - Upvote don't say Thanks :

You can't add element in string array directly. You can follow those steps

You can create list from string array
Add the element in list
Again convert list to array
Update the outer list

for (int i = 0; i < list2.size(); i++) {
    String[] subList = list2.get(i);
    if (null != subList && subList[4].equals("x") &&
                    subList[5].equals("y")) {
        ArrayList<String> list = new ArrayList<>(Arrays.asList(subList)); // create a list
        list.add("z"); // add in list
        list2.set(i, list.toArray(new String[0])) // create array from list and update parent list
    }
}

Or create a List<List<String>> from List<String[]> first then add in inner list

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