import java.util.*;
/**
   This class implements linked lists of integers.
 * Created: Mon Nov 10 11:36:19 2003
 *
 * @author <a href="mailto:berstel@univ-mlv.fr">Jean Berstel</a>
 * @version $Revision: 1.17 $
 */
public class IntList {
    int val;
    IntList next;
    IntList(int p) { this(p, null); }
    IntList(int p, IntList s ) { val = p; next = s; }
    IntList(){}
    static IntList add(int p, IntList s ){
	return new IntList(p,s);
    }
    public boolean equals(IntList l){
	if (val != l.val) return false;
	if (next == null) return l.next == null;
	return next.equals(l.next);
    }
    public String toString() {
	String s = " "+ val;
	if(next == null)

	    return s + ".";
	else
	    return s + next;
    }
    
    public String show(String name) {
	return name + this;
    }
    public static void main(String[] args){
	IntList l = null, m = null;
	l = add(0,l);
	m = add(0,m);
	System.out.println(l.equals(m));
	LinkedList t = new LinkedList();
	t.addLast(l);
	System.out.println(t.indexOf(m));
    }
} // IntList