Describe the Considerations When Creating Custom Controllers and Controller Extensions. PLATFORM-DEVELOPER-II Practice Questions (Page 5)

Questions 21–24

1. 21foundation · easy

   What does a custom controller or extension return from an action method to navigate to another page?

   • AA Boolean value indicating success
   • BA String containing the page URL
   • CA PageReference object
   • DA Visualforce component
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2. 22foundation · easy

   How can a controller extension access the standard controller's methods?

   • ABy using the `super` keyword
   • BBy defining methods with the same name in the extension
   • CBy calling methods directly on the standard controller instance passed to the constructor
   • DBy using the `System.StandardController` class
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4. 23expert · hard

   A custom controller for a Visualforce page performs a SOQL query that returns a large number of records. The page also has a method that updates each record. The developer is concerned about hitting the heap size limit. What is the best practice to avoid this?

   • AUse a transient variable to store the query results.
   • BUse a SOQL query with a LIMIT clause to reduce the number of records.
   • CPerform the update in a batch class to avoid heap limits.
   • DQuery only the fields that are needed and avoid storing unnecessary data.
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5. 24application · medium

   An organization uses a standard Account detail page and wants to add a custom button that shows related Opportunities in a custom Visualforce component. The developer creates a controller extension for the standard Account controller. What is a valid way to implement this?

   • AThe extension cannot access the standard controller's record because it is private.
   • BThe extension must be defined with a constructor that takes no arguments to be used with a standard controller.
   • CThe extension must override the standard controller's save() method to add the custom behavior.
   • DThe extension's constructor takes the standard controller as a parameter and can access the current Account record via getRecord().
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