package dbj.pjama; import java.util.*; import org.opj.*; class Author { static { OPRuntime.roots.add (Author.class); } static List extension = new LinkedList (); String firstname, lastname; public Author (String s1, String s2) { firstname = s1; firstname = s2; extension.add (0, this); } public String toString () { return "Author: " + firstname + " " + lastname; } }