androidengineers.Book a session | Feature | Java Thread | Kotlin Coroutine |
|---|---|---|
| Weight | Heavyweight (OS managed) | Lightweight (User-space managed) |
| Memory | ~1MB stack per thread | ~KB per coroutine |
| Creation | Expensive | Cheap |
| Blocking | Blocks the thread when waiting | Suspends (frees thread) when waiting |
| Context Switching | OS Kernel switch (expensive) | Software switch (fast) |
| Scalability | Limited (thousands max) | Massive (millions possible) |
Key Concept: Coroutines are "computations that can be suspended". They can pause execution without blocking the underlying thread, allowing that thread to do other work.
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