Now look at Fowler's work on design pattems. Look at the organizational pattern created by Fowler as a way to document the structure of a solution so that its use by others is optimized. and at the adaptation in the textbook: Select an application with which you are familiar Look for reuse opportunities in the application, then create several design patterns: use the organizational patterns in Figure 18-6. Have someone who is knowledgeable and has experience in object-oriented design review your design patterns for applicability. If this were not a classroom exercise, could your design patterns be used for other actual applications?

Figure 18-6:-

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Alternate Courses: Step 7: The memberverifies the order. If no changes we necessary, the member clicks the [Continue] button. Step 9: The member responds by clicking the appropriate check box for the desired payment option Step 11: The membervenies the order. If no changes are necessary, the member clicks the [Continue] Eution Step 8: The system chacts the status of the member's account. if status is satisfactory, the system prompts the member to select the desired payment option (to be billed later or pay immediately with a credit card) Step 10. The system then displays a find summary of the order invandow 23-Order Summery Display. The system also prompts the member to make any required changes Step 12: The system records the order information (including back orders, if necessary) Step 13 invoke abstract use case MSS-AUCO DO Determine Appropriate Distribution Center and Release Order to Be Filled Step 14 Once the order is processed, the system generates an order curfirmation and displays it in window Wow-Order Confimation Display The system also sends the confirmation by e-mail Invokedtstract use case MISS-AUC004 00 Send Electronic Member Comespondence. Alt-Step 3: the member clicks on the item name, the system displays a pop-up window, Wis-Product Detail Display, which contains all the product details, including a graphic of its cover. The member clicks the [Close] button to close the pop-up window Alt-Step 36: if member wants to perform keyword search, Invoke abstract use case MSS.AUC006 DO Search Product Catalog by Keyword. Alt-Step 5: If member wants to change demographic information, invoke abstract use case MISS AUCO07:00 Change Member Promie. Alt-Step 7: if the order requires charges the member can delete any item no longer wanted by deselecting the check box by item and/or changing the order quantity. Once the member has completed the order changes, he or she clicks the [Update Order] button. The system reprocesses the order (go to stap 6). f the member clicks the [Do More Shopping] button, go to step 3. If the member clicks the [Update Member Profile] button, invoke abstract use case M55-AUC00700 Change Member Profile and then go to step 6. Alt-Step 8: If the member's account is not in good standing, display to the member using window W09-Member Account Status Display, the account status, the reason the order is being held, and what actions are necessary to resolve the problem. In addition an e-mal is sent to the member with the same inkumation. I woke dust use Lase MSSAUCO04.00 Send Electronic Menu Cursure. The system prompts the member to hold the order for later processing or cancel the order. If the member wishes to hold the order by clicking the [Save Order] button, the system records the order information, places it in hold status, and then displays the Sound Stage main page, window Woo-Member Home Page. If the member chooses to cancel the order by clicking the [Cancel Order] button, the system erases the inputted information, and then displays the SoundStage main page, window WOO-Member Home Page Terminate the use case. Alt-Step 10: If the member selects the option to pay by credit card, invoke abstract use case MSS-AUCO12.00 Pay by Credit Card. If the member cannot pay by credit card, the system prompts the member to hold the order for later processing or cancel the order. If the member wishes to hold the order by clicking the [Save Orderi button, the system records the order information, places it in held status, and then displays the SoundStage main page, window W00-Member Home Page if the member chooses to cancel the order by dicking the [Cancel Order] button, the system erases the inputted information and then displays the SoundStage main page, window WOO-Member Home Page Terminate the use case.