Constructor
Load product database with two sample products
products = new Hashtable();
ProductBean product1 = new ProductBean
("Red Hat Linux", "Red Hat Linux Operating System",
54.99, "A358185");
ProductBean product2 = new ProductBean
("McAfee PGP", "McAfee PGP Personal Privacy",
19.99, "A358565");
products.put(product1.getSKU(), product1);
products.put(product2.getSKU(), product2);