Describe the Implications of Compound Data Types in Apex Programming. PLATFORM-DEVELOPER-II Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   Which pattern is commonly used to avoid hitting the DML row limit when inserting many records?

   • AInserting records one by one in a loop
   • BUsing a Set of sObjects to insert unique records
   • CUsing a List of sObjects and inserting them in one DML call
   • DUsing a Map of sObjects to insert records
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2. 2foundation · easy

   What is a common pitfall when using the Map.get() method?

   • AIt returns the first value in the map
   • BIt throws an exception if the key does not exist
   • CIt returns an empty string if the key does not exist
   • DIt returns null if the key does not exist
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4. 3foundation · easy

   What exception is thrown when an invalid cast is attempted in Apex?

   • AQueryException
   • BDmlException
   • CTypeException
   • DNullPointerException
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5. 4application · medium

   A developer receives an Object from a method that could be either a List<String> or a List<Integer>. The developer needs to safely process the list as a List<String>. Which code snippet correctly performs a safe cast?

   • AList<String> stringList = (List<String>) JSON.deserialize(obj, List<String>.class);
   • Bif (obj instanceof List<String>) { List<String> stringList = (List<String>) obj; }
   • CList<String> stringList = (List<Object>) obj;
   • DList<String> stringList = (List<String>) obj;
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6. 5application · easy

   A developer needs to check if a specific Account ID is present in a Set<Id> named accountIds. Which code snippet correctly performs this check?

   • Aif (accountIds.contains(accId)) { // do something }
   • Bif (accountIds.indexOf(accId) >= 0) { // do something }
   • Cif (accountIds.get(accId) != null) { // do something }
   • Dif (accountIds.has(accId)) { // do something }
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