Describe the Considerations When Creating Custom Controllers and Controller Extensions. PLATFORM-DEVELOPER-II Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   What is view state in a Visualforce page?

   • AThe database records displayed on the page.
   • BThe HTML and CSS of the page as rendered in the browser.
   • CThe user's session and login information.
   • DThe serialized state of the controller and extensions that is stored on the server between requests.
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2. 12application · medium

   A developer is writing a custom controller for a Visualforce page that queries a large number of records and performs complex calculations. The page is expected to be used by many users concurrently. What is a best practice to avoid hitting governor limits?

   • AUse a single SOQL query to retrieve all needed records and perform calculations in Apex.
   • BAvoid SOQL queries entirely by using the standard controller.
   • CPerform all calculations in the constructor to avoid repeated work on postback.
   • DUse a SOQL query for each record to ensure accuracy.
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4. 13foundation · easy

   What is a common use of the constructor in a custom controller or extension?

   • ATo handle form submissions and save actions
   • BTo initialize page state and perform initial data retrieval
   • CTo define the page's layout and styling
   • DTo override the standard controller's methods
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5. 14expert · hard

   A developer is optimizing a Visualforce page that uses a custom controller. The page displays a list of records and has a search form. The developer wants to reduce view state while maintaining functionality. Which combination of techniques is most effective?

   • AMark the search results list as transient and re-query on every postback.
   • BStore the search results in a static variable.
   • CUse a custom controller with a non-transient list and a transient search term.
   • DUse a standard controller for the list and a custom controller for the search.
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6. 15expert · hard

   A custom controller has an action method that saves a record and then redirects to a Visualforce page that displays a success message. The developer wants to avoid the success message appearing if the user refreshes the page. What is the best approach?

   • AUse a PageReference with setRedirect(true) to perform a new request.
   • BUse the standard controller's save() method and rely on its built-in redirect.
   • CStore the success message in a static variable.
   • DUse a transient variable to hold the success message.
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