java-language-syntax

To check Java syntax availability, identify your target LTS baseline and compare expression forms to ensure baseline-safe code changes. This process distinguishes stable features from preview features, providing fallback guidance for unsupported syntax on older Java versions.

Switch expressions and text blocks are not available in the Java 11 baseline. You must target Java 17 or later to use these syntax forms safely, and this guidance provides fallback patterns for rewriting code to compile on older LTS baselines.

The best way to migrate Java code is to compare syntax availability across LTS baselines and apply baseline-safe code changes. This approach enforces target baseline identification and distinguishes stable versus preview features to prevent compilation failures.

To rewrite var and sealed classes for an older Java baseline, apply the provided fallback guidance to replace unsupported syntax. This ensures your code adheres to foundational java.base package boundaries and compiles correctly on the target version.

Java pattern matching availability depends on the specific LTS baseline, as some forms remain preview features while others are stable. Identifying the target baseline determines whether preview status applies and what fallback guidance is needed for compilation.