publication.java

import java.util.*;

public class Publication {
    private static Set ps= new HashSet(650000);
    private static int maxNumberOfAuthors = 0;
    private String key;
    private Person[] authors;	// or editors

    public Publication(String key, Person[] persons) {
        this.key = key;
        authors = persons;
        ps.add(this);
        if (persons.length > maxNumberOfAuthors)
            maxNumberOfAuthors = persons.length;
    }
    
    public static int getNumberOfPublications() {
        return ps.size();
    }
    
    public static int getMaxNumberOfAuthors() {
        return maxNumberOfAuthors;
    }
    
    public Person[] getAuthors() {
        return authors;
    }
    
    static Iterator iterator() {
        return ps.iterator();
    }
}