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    <p>The setter <code>setBarCode()</code> should either (a) succeed, or (b) indicate failure (probably using an <code>IllegalArgumentException</code> since we're in Java) rather than fail silently. If you were to use an <code>IllegalArgumentException</code>, this code would work nicely:</p> <pre><code>boolean acceptable; try { item.setBarCode(barCode); acceptable = true; } catch(IllegalArgumentException e) { acceptable = false; } if(acceptable) { if(store.addItem(barCode)){ System.out.println(store.stockedItems.get(barCode).getProductName() + " has been added to the store's inventory"); } else { item.setQuantity(1); System.out.print("Enter the item's name: "); productName = scan.nextLine(); productName = productName.toLowerCase(); item.setProductName(productName); store.stockedItems.put(barCode, item); System.out.println(store.stockedItems.get(barCode).getProductName() + " has been added to the store's inventory"); } } break; </code></pre> <p>However, I'd recommend you not rely on the failure of a setter for correctness. Stylistically, it "smells funny." Rather, I'd put the test in another (probably <code>static</code>) method, test <em>before</em> you call the setter and react accordingly, and then put an <code>assert</code> in the setter. So, more like this:</p> <pre><code>// Somewhere up in your code -- Sorry, fixed up your regex private static final Pattern BARCODE=Pattern.compile("^\\d{12}$"); public static boolean isValidBarcode(String candidate) { return BARCODE.matcher(candidate).matches(); } // Now your "real" code case "A": Item item = new Item(); System.out.print("Enter a barcode: "); barCode = scan.nextLine(); if(isValidBarCode(barCode)) { item.setBarCode(barCode); if(store.addItem(barCode)) { System.out.println(store.stockedItems.get(barCode).getProductName() + " has been added to the store's inventory"); } else { item.setQuantity(1); System.out.print("Enter the item's name: "); productName = scan.nextLine(); productName = productName.toLowerCase(); item.setProductName(productName); store.stockedItems.put(barCode, item); System.out.println(store.stockedItems.get(barCode).getProductName() + " has been added to the store's inventory"); } } else { System.out.println("That's not a valid bar code."); } break; // And, finally, your setBarCode() method public void setBarCode(String code) { assert isValidBarCode(code); barcode = code; } </code></pre>
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