Encapsulation and GUI

Question

public final class Book {

    private final String title;
    private final List<Author> listofAuthors;

    public Book(String title, List<Author> listofAuthors)
    {
        this.title = title;
        this. listofAuthors = listofAuthors;
    }

    public JComponent display() {
        JPanel bookPanel = new JPanel();
        bookPanel.add(new JLabel(title));
        JList authorsList = new JList(); // Or similar
        for (Author author: authors) {
            authorsList.add(author.display());
        }
        bookPanel.add(authorsList);
        return bookPanel;
    }
}

Author class:

public final class Author 
{
  private final String firstname;
  private final String lastname;

  public Author(String firstname, String lastname)
  {
    this.firstname = firstname;
    this.lastname = lastname;
  }
    //other methods
 }

Question:

1. I'm following up on this post where I asked how to display data in a GUI without getters. My problem is, if I wanted to change an attribute, for example, remove an author from the list and display the change, how would I do it?

2. To know which author was selected from the JList I need to know what index the user selected. How would I get that if the JList is buried in the display method?

3. If I had a button, and used it to trigger an event after making a selection in the JList, where would that go?