new Customer("Will", "Snowman", "Mr.", "12 Federal Plaza",
"12346", "AnOtherTown", "Lilliput");
final GregorianCalendar gc = new GregorianCalendar(2000, 10, 23);
final Invoice invoice = new Invoice(customer, gc.getTime(), "A-000-0123");
final Article mainboard = new Article("MB.001", "Ancient Mainboard", 199.50f);
final Article hardDisk = new Article
("HD.201", "Very Slow Harddisk", 99.50f, "No warranty");
final Article memory = new Article("MEM.36", "Dusty RAM modules", 59.99f);
final Article operatingSystem = new Article
("OS.36", "QDOS with C/PM compatibility module", 259.99f, "Serial #44638-444-123");
invoice.addArticle(mainboard);
invoice.addArticle(hardDisk);
invoice.addArticle(memory);
invoice.addArticle(memory);