Coroutines for Java Developers

on YouTube ↗43m

" summary

Shows how Kotlin coroutines use the suspend keyword and compiler-generated continuation objects to turn blocking calls into suspensions (example: wrapping a CompletableFuture to resume a continuation), with APIs like launch/async/withContext and Dispatchers for executor mapping. Demonstrates sequences with yield, measures that millions of coroutines start in ~1.5s while OS threads cap at ~4k–12k, and explains structured concurrency that auto-cancels child coroutines; works on JVM (down to Java 6) and powers Ktor.

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" chapters (13)

1. 0:00Start
2. 10:35Fibonacci Sequence
3. 11:45Coroutine Builder == Sequence
4. 12:43Suspend & Fun Rules
5. 13:12How does it work?
6. 19:58macos / Linux
7. 24:33Threads vs Coroutines
8. 25:54Example Service
9. 28:15Rx Operators
10. 33:46Maven/Gradle Dependency
11. 35:17Launch Coroutine
12. 36:32Switch Dispatcher
13. 37:38Structured Concurrency

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