Thread: Creating an object through a class parameters

I'm trying to figure out how to create a class through a constructor's parameters here is my code:

public class Article {
  private String title;
  private String body;
  private ArrayList <Author> authors = new ArrayList<Author>(); // this isn't how I'm supposed to create the object
  private GregorianCalendar pubDate = new GregorianCalendar();  // this isn't how I'm supposed to create the object
  private boolean published;
  private SimpleDateFormat a = new SimpleDateFormat("yyyy-MM-dd 'at' hh:mm:ss");
 
 
  public Article(String title) {
    this.title = title;
  }
 
  public Article(String title, String body, ArrayList<Author> author, GregorianCalendar pubDate,
                   boolean published) {
    this.title = title;
    this.body = body;
    this.authors = author; //somehow I'm supposed to pass the author class to this and create an arraylist
    this.pubDate = pubDate;
   // this.pubDate.set(year, month - 1, dayOfMonth, hour, minute);
    this.published = published;
  }

My teacher says I shouldn't instantiate in the private fields (*or this is what I think he meant). If I create a object inside the constructor, where will the field be stored? wouldn't the object disappear? Do I have to create the object in the private fields area first?

thanks, turns out he just didn't want me to create the new object in the private fields, but just create:

private ArrayList <Author> authors;
which (*I'm told) will be filled with data passed into the constructor.