SALESFORCE-PD1 Developer Fundamentals Practice Question
Which collection method is used to add all elements from one Set into another Set in Apex?
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
✓
addAll()
The addAll() method is available on Set, List, and Map collections to add multiple elements at once.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
addAll()
Why this is correct
addAll() adds all elements of a collection to the target set.
- ✗
merge()
Why it's wrong here
merge() is used for DML operations on sObjects, not for combining collections.
- ✗
combine()
Why it's wrong here
combine() is not a valid collection method in Apex.
- ✗
putAll()
Why it's wrong here
putAll() is used specifically for Map collections, not Sets.
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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
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