Match each Java 17 feature to its description.
Drag a concept onto its matching description — or click a concept then click the description.
Restricts which classes can extend or implement a type
Allows patterns in case labels for type checks and destructuring
Transparent carriers for immutable data
Multi-line string literals with automatic formatting
Switch that can be used as an expression and returns a value
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Sealed Classes: A feature that allows a class or interface to restrict which other classes or interfaces may extend or implement it.
These are key features introduced or enhanced in recent Java versions including 17.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Sealed Classes: A feature that allows a class or interface to restrict which other classes or interfaces may extend or implement it.
Why this is correct
Sealed classes, finalized in Java 17, enable controlled inheritance by specifying permitted subclasses.
Records: A feature that provides a compact syntax for declaring classes that are transparent holders for immutable data.
Why this is correct
Records, standardized in Java 16, automatically generate constructor, accessors, equals, hashCode, and toString for immutable data carriers.
Pattern Matching for switch (Preview): A preview feature that allows switch expressions and statements to test an expression against a pattern, enabling more concise and safe code.
Why this is correct
Pattern matching for switch (JEP 406) is a preview in Java 17, allowing patterns in case labels to extract components and simplify code.
Text Blocks: A feature that allows multi-line string literals with automatic indentation and escape handling.
Why this is correct
Text blocks, finalized in Java 15, simplify the writing of multi-line strings by managing indentation and escape sequences.
Enhanced NullPointerExceptions: A feature that allows a class to restrict which subclasses can implement it.
Why it's wrong here
Incorrect – Enhanced NullPointerExceptions (Java 14) precisely describe which variable was null, not inheritance restriction. This definition actually describes Sealed Classes.
Switch Expressions: A preview feature that allows testing an expression against a pattern using switch.
Why it's wrong here
Incorrect – Switch Expressions are a standard feature since Java 14, not a preview. The description refers to Pattern Matching for switch (preview in Java 17).
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Last reviewed: Jun 11, 2026
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