The Art of Java Language Pattern Matching
summary
Project Amber adds concrete language features: Pattern matching for instanceof (JEP 433) and Pattern matching for switch (JEP 441) plus record patterns, unnamed variables and primitives in patterns (JEP 455), with record deconstruction cutting a 14-line point class to one line and JShell revealing a surprising variable-shadowing bug; switch expressions (JDK 12) enforce exhaustiveness with sealed classes, null cases are auto-inserted, guarded patterns use the contextual keyword when (can be confusing), and Platform Prime claims 43% more transactions per second by swapping the JVM.
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chapters (12)
- 0:00Introduction to Java pattern matching
- 2:31Switch expressions in Java
- 7:04Java records and algebraic data types
- 10:36Sealed classes and inheritance
- 12:20Pattern matching with instanceof
- 21:11Pattern matching in switch statements
- 27:57Guarded patterns and dominance
- 35:30Pattern matching with records
- 41:16Unnamed pattern variables
- 44:10Primitive types in pattern matching
- 46:40Autoboxing and type matching edge cases
- 52:51Summary and future of pattern matching
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