Describe the Implications of Compound Data Types in Apex Programming. PLATFORM-DEVELOPER-II Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which of the following is a valid declaration of a nested collection in Apex?

   • AMap<String, String> myMap = new Map<String, List<String>>();
   • BList<String> myList = new List<List<String>>();
   • CList<List<String>> myList = new List<List<String>>();
   • DSet<Set<String>> mySet = new Set<Set<String>>();
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2. 7foundation · easy

   Which Apex data type is used to represent a database record?

   • ASet
   • BList
   • CsObject
   • DMap
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4. 8foundation · easy

   Which method is used to check if a Set contains a specific element in Apex?

   • AindexOf()
   • Bcontains()
   • Cincludes()
   • Dhas()
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5. 9foundation · easy

   Given the following code snippet, what is the output when it is executed?

   • A3
   • B4
   • C5
   • DAn exception is thrown
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6. 10expert · hard

   A developer is writing a trigger on Account that needs to update related Contacts when an Account's Industry changes. The trigger has access to Trigger.new, a list of Account records. To avoid querying Contacts inside a loop, which approach should be used?

   • AUse a Map<Id, Account> of Trigger.new and then query Contacts for each account using the map.
   • BQuery Contacts inside a loop for each Account in Trigger.new.
   • CUse a List<Contact> and add all Contacts from a single query, then filter by AccountId in memory.
   • DQuery all Contacts related to the Accounts in Trigger.new, then use a Map<Id, List<Contact>> to group them by AccountId.
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