public class Stack implements Selectable {
    private Table tablica;
    private int stan=0;
    public Stack() {
        tablica = new Table();
    }

    public Selector getSelector() {
        return tablica;
    }

    void add(String a) {
        tablica.table[stan++] = a;
    }

    class Table implements Selector {
        final int TABLE_SIZE = 100;
        public String table[] = new String[TABLE_SIZE];
        public int current = 0;


        public boolean end() {
            return (table[current] == null);
        }

        public Object getCurrent() {
            return (table[current]);
        }

        public void next() {
            if (end())
                throw new NoSuchElementException();
            else
                current++;

        }
    }
}