package prova;

import java.util.Iterator;
import java.util.LinkedList;

public class Prova{
    static int counter = 4;
    private int value = 2;

    public Prova() {
        value = ++counter;
    }
    public String toString(){
        return this.getClass().getName()+value+" ";
    }

    public void finalize(){
        System.out.println("F"+value);
    }
}

class G extends Prova{
    public static void main(String[] args) {
        LinkedList<Prova> x = new LinkedList<Prova>();
        Prova a1 = new G();
        G a2 = new G();
        Prova a3 = new Prova();
        x.add(a1); x.add(a3);
        a1 = null; a2 = null; a3 = null;
        Iterator<Prova> it = x.iterator();
        while(it.hasNext()){
            System.out.print(it.next());
        }
        System.gc(); System.runFinalization();
    }
}