SALESFORCE-PD1 Developer Fundamentals Practice Question
Which TWO collections are valid in Apex and maintain the insertion order of their elements? Choose 2 answers.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Map
Lists and Maps (specifically keeping insertion order for iteration) maintain insertion order, whereas standard sets do not guarantee order.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
TreeSet
Why it's wrong here
TreeSet does not exist in Apex.
- ✗
Set
Why it's wrong here
Sets do not guarantee any specific iteration order.
- ✓
Map
Why this is correct
Maps in Apex preserve the insertion order of their keys when iterated over.
- ✓
List
Why this is correct
Lists preserve the order in which elements are added.
- ✗
Queue
Why it's wrong here
Queue is not an Apex collection type.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Salesforce exam blueprint
This SALESFORCE-PD1 practice question is part of Courseiva's free Salesforce certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SALESFORCE-PD1 exam.