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Java 21
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- 1Replacing the Visitor Pattern with Java 21 Sealed Hierarchies●Kill the Visitor Pattern: Refactoring Domain ASTs with Java 21 Sealed Hierarchies For... # java # design # programming #
A developer is arguing that the classic Visitor pattern for traversing abstract syntax trees should be retired, using Java 21's sealed class hierarchies and pattern matching instead. The approach lets exhaustive switch statements handle AST node types directly, removing boilerplate interfaces and accept methods that the pattern traditionally requires.