Category class for dynamic menu

Category.java

public class Category {
    private String name;

    public Category() {
        name = "" + Math.random();
    }

    public List<Category> getChildCategories() {
        List<Category> childCategories = new ArrayList<>();
        for(int i=0; i<20; i++) {
            childCategories.add(new Category());
        }
        return childCategories;
    }

    @Override
    public String toString() {
        return name;
    }
}