[Solved] Create an instance of subclass inside superclass

ngongocthinh123 Asks: Create an instance of subclass inside superclass
Whenever i create an instance of superclass, i want it automatically creates 1 instance of the subclass. Then i can call the subclass from an instance of the superclass. Here i have a superclass name “SortArticles”:

public class SortArticles {
private String title;
private String linkToFullArticles;
private FullArticle fullArticleObject;

public FullArticle getFullArticleObject() {
    return this.fullArticleObject;

Here i have a subclass name “FullArticle”:

public class FullArticle extends SortArticles {
private List<Label> labelList;

i want to call like this:

ArrayList<SortArticles> sortList = new ArrayList<>();
sortList.add(new SortArticles());

It’s possible to do that? I think of using hashmap to link sort and full, but i need create 2 arraylist, and link it manually :)

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