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Platform and version requirements: JVM (1.0)
Throws(vararg exceptionClasses: KClass<out Throwable>)

This annotation indicates what exceptions should be declared by a function when compiled to a JVM method.

Example:

@Throws(IOException::class)
fun readFile(name: String): String {...}

will be translated to

String readFile(String name) throws IOException {...}

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.jvm/-throws/-init-.html