Java Study #3 — Exception Handling · Concurrency · record · Modern Java · Gradle
Wrapping up the Java syntax sweep. Understood that exception handling isn't about debugging convenience — it's a safeguard so backend servers don't die in production. The difference between print vs throw — print doesn't convey failure to the caller, but exceptions force propagation. Concurrency with ExecutorService · newFixedThreadPool — 3 seconds sequential → 1 second parallel (measured 3008ms → 1006ms). record auto-generates fields, constructor, accessors, toString, equals, hashCode — a perfect fit for pure data containers like RainDataDTO from a rain gauge data logger. Also covered Modern Java features like var/switch arrows/text blocks. Finally, Gradle — once you have hundreds of files, compiling one by one with java is impossible, and it also auto-fetches external libraries. build.gradle is the core config file.
