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Shyam Patel's questions

Martin Hope
Shyam Patel
Asked: 2024-05-29 14:13:19 +0800 CST
  • 5

我试图理解为什么异常会在没有被?async包围的情况下沿着层次结构传递。为什么在处理异常时coroutineScope不需要这样？coroutineScopelaunch

fun main() {
    runBlocking {
        this.launch {// case 1
            try {
                throw java.lang.IndexOutOfBoundsException()
            } catch (e: Exception) {
                println("Caught IndexOutOfBoundsException")
            }
        }
        try {
            coroutineScope {
                val deferred = async {// case 2
                    throw ArithmeticException()
                }
                deferred.await()

            }
        } catch (e: ArithmeticException) {
            println("Caught ArithmeticException")
        }
        try {
            val deferred = async {//case 3
                throw ArithmeticException()
            }
            deferred.await()
        } catch (e: Exception) {
            println("Caught ArithmeticException but passed to root as well")
        }
    }
}

我当前的输出如下：

Caught IndexOutOfBoundsException
Caught ArithmeticException
Caught ArithmeticException but passed to root as well
Exception in thread "main" java.lang.ArithmeticException
    at TryItYourself3Kt$main$1$deferred$1.invokeSuspend(TryItYourself3.kt:26)
    at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
    at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
    at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:277)
    at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:95)
    at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:69)
    at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
    at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:48)
    at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source)
    at TryItYourself3Kt.main(TryItYourself3.kt:5)
    at TryItYourself3Kt.main(TryItYourself3.kt)

Process finished with exit code 1
kotlin-coroutines