SALESFORCE-PD1 Developer Fundamentals Practice Question
Which TWO options represent valid ways to instantiate and populate a Set of Strings in Apex? Choose 2 options.
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
✓
Set<String> s = new Set<String>(); s.add('A');
Sets can be instantiated with new Set<String>() and populated with add() or addAll().
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set<String> s = new Set<String>(); s.add('A');
Why this is correct
Sets can be instantiated empty and populated using the add method.
- ✗
Set<String> s = new Set<String>('A', 'B');
Why it's wrong here
Constructor arguments for Sets do not accept multiple individual string parameters like this.
- ✗
Set<String> s = Set.valueOf('A,B');
Why it's wrong here
valueOf is not a method on the Set class.
- ✗
Set<String> s = ['A', 'B'];
Why it's wrong here
Square brackets are reserved for SOQL queries and list inline notation in specific older contexts, not direct set assignment like this.
- ✓
Set<String> s = new Set<String>{'A', 'B'};
Why this is correct
Sets can be initialized inline using curly brace syntax.
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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
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