Что возвращает эта функция?

class Main {
    private Product inputProduct() {
        System.out.println("  Input product ->");
        String title = keyboard("    Name");
        Product product = new Product();
        product.setTitle(title);
        return product;
    }
    private Product readAndChange() {
        Product p = inputProduct();
        /* ... */
    }
}

class Main {
    private Product p;
    private void inputProduct() {
        System.out.println("  Input product ->");
        String title = keyboard("    Name");
        Product product = new Product();
        product.setTitle(title);
        p = product;
    }
    private Product readAndChange() {
        inputProduct();
        Product p = this.p;
        /* ... */
    }
}

class Main {
    private static class ProductListener {
        public Product p;
        public void give(Product p) { this.p=p; }
        public Product take() { return this.p; }
    }
    ProductListener listener = new ProductListener();
    private void inputProduct(ProductListener l) {
        System.out.println("  Input product ->");
        String title = keyboard("    Name");
        Product product = new Product();
        product.setTitle(title);
        l.give(product);
    }
    private Product readAndChange() {
        inputProduct(this.listener);
        Product p = listener.take();
        /* ... */
    }
}