public interface Container {
    Iterator getIterator();
    void add(Object o);
}

public interface Iterator {
    boolean hasNext();
    Object next();
}

public class NameRepository implements Container{

    private String names[];
    private int added = 0;

    public NameRepository(int size) {
        names = new String[size];
    }

    @Override
    public void add(Object o) {
        if (added >= names.length) {
            String[] temp = new String[names.length + 1];
            for (int i = 0; i < names.length; i++) {
                temp[i] = names[i];
            }
            names = temp;
        }
        names[added] = (String) o;
        added++;
    }

    @Override
    public Iterator getIterator() {
        return new NameIterator();
    }

    private class NameIterator implements Iterator{

        int position = 0;

        @Override
        public boolean hasNext() {
            return position < names.length;
        }

        @Override
        public String next() {
            if (this.hasNext()) {
                return names[position++];
            }
            return null;
        }

    }
}