Quick Answer
The answer is pattern matching for switch, which is not a standard Java 17 feature. This is correct because pattern matching for switch was introduced as a preview feature under JEP 406, meaning it requires the --enable-preview flag at compile and runtime to be used, whereas standard features in Java 17 are finalized and require no such flags. On the Oracle Certified Professional Java SE 17 Developer 1Z0-829 exam, this distinction between standard and preview features is a common trap—many candidates assume all new language enhancements in a release are automatically standard, but preview features like pattern matching for switch are explicitly excluded from the certified feature set. A helpful memory tip is to remember that preview features are always “opt-in” with a flag, while standard features are “ready out of the box.”
This 1Z0-829 practice question tests your understanding of working with arrays and collections. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Given the above Java version, which of the following is NOT a standard Java 17 feature?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "NOT"
Why it matters: Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
All of the above are standard
Why wrong: Incorrect: Pattern matching for switch is preview.
Sealed classes
Why wrong: Incorrect: Sealed classes are standard in Java 17.
Text blocks
Why wrong: Incorrect: Text blocks are standard since Java 15.
Pattern matching for switch (preview)
Correct: This is a preview feature in Java 17, not standard.
Records
Why wrong: Incorrect: Records are a standard feature in Java 17.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Pattern matching for switch (preview)
Option D is correct because pattern matching for switch is a preview feature in Java 17, not a standard feature. It was introduced as a preview under JEP 406 and requires the --enable-preview flag to be used. Standard features in Java 17 are finalized and do not require any preview flags.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
All of the above are standard
Why it's wrong here
Incorrect: Pattern matching for switch is preview.
Sealed classes
Why it's wrong here
Incorrect: Sealed classes are standard in Java 17.
Text blocks
Why it's wrong here
Incorrect: Text blocks are standard since Java 15.
Pattern matching for switch (preview)
Why this is correct
Correct: This is a preview feature in Java 17, not standard.
Clue confirmation
The clue word "NOT" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Records
Why it's wrong here
Incorrect: Records are a standard feature in Java 17.
Common exam traps
The trap here is that candidates may assume pattern matching for switch is a standard feature because it is widely discussed and similar to other finalized features like records or sealed classes, but Oracle deliberately kept it in preview in Java 17 to test further refinements.
Detailed technical explanation
Pattern matching for switch (JEP 406) allows switch expressions and statements to match on patterns, including type patterns and guarded patterns, but remains in preview in Java 17 to gather feedback. Under the hood, the compiler generates synthetic bridge methods and uses instanceof checks to implement pattern matching, which can lead to more concise and safer code when handling multiple types. In real-world scenarios, this feature is useful for reducing boilerplate in type-based dispatch, but developers must remember to enable preview to use it.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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What to study next
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FAQ
Working with Arrays and Collections — This question tests Working with Arrays and Collections — Read the scenario before looking for a memorised answer..
The correct answer is: Pattern matching for switch (preview) — Option D is correct because pattern matching for switch is a preview feature in Java 17, not a standard feature. It was introduced as a preview under JEP 406 and requires the --enable-preview flag to be used. Standard features in Java 17 are finalized and do not require any preview flags.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "NOT". Negative qualifier — you are looking for the one option that does NOT apply. Most options will be true; only one is false for this scenario.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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