Describe the Implications of Compound Data Types in Apex Programming. PLATFORM-DEVELOPER-II Practice Questions (Page 5)

Questions 21–25

1. 21foundation · easy

   What is the typical result of a SOQL query in Apex?

   • AA List of sObjects
   • BA single sObject
   • CA Map of sObjects
   • DA Set of sObjects
   Reveal Solution Discussion Select an answer first
2. 22foundation · easy

   In a Map, what happens if you put a key that already exists?

   • AAn exception is thrown
   • BThe map is cleared
   • CThe old value is preserved and the new value is ignored
   • DThe new value replaces the old value
   Reveal Solution Discussion Select an answer first
4. 23foundation · medium

   Which Apex loop construct is specifically designed to iterate over each element in a collection or sObject list without requiring an explicit index variable?

   • AA while loop that increments a counter until it reaches the collection size
   • BA do-while loop that processes the first element and then continues while a condition is true
   • CA for-each loop that declares a local variable of the element type and assigns each element in turn
   • DA for loop that uses an integer counter to access elements by position
   Reveal Solution Discussion Select an answer first
5. 24expert · hard

   A developer needs to track the total quantity of each product sold per region. The data is stored in a list of OrderItem records, each with a Product2Id and a region code. The developer needs to aggregate the quantities by product and region. Which data structure is most appropriate for this aggregation?

   • AMap<String, Map<String, Integer>> regionToProductToQuantity
   • BMap<String, List<OrderItem>> regionToOrderItems
   • CSet<String> regionCodes and Map<String, Integer> productQuantities
   • DList<Map<String, Integer>> productQuantities
   Reveal Solution Discussion Select an answer first
6. 25foundation · easy

   Which of the following correctly lists the compound data types available in Apex?

   • ALists, tuples, and sObjects
   • BCollections, arrays, and objects
   • CArrays, dictionaries, and records
   • DLists, sets, maps, and sObjects
   Reveal Solution Discussion Select an answer first