12/20/2023 0 Comments Kotlin map not nullVar mapCustomers: IMap? = instance?.getMap("customers") Val mapCustomers = (instance?.getMap("customers")) as HashMap īut my main question concerns this piece of code: My first question is whether there is a more elegant way to get around having to declare that helper map myMap. To get things to compile I introduced the helper variable myMap. Println("Customer with key 1: "+ myMap.get(“1”)) Īs the code shows in line 3 the message instance?.getMap(“customers”) returns an Hazelcast type named IMap which implements. Val mapCustomers: IMap? = instance?.getMap("customers") Val instance = Hazelcast.newHazelcastInstance(cfg) Normally,types of String are not nullable.I’m playing a bit with Hazelcast at the moment using Kotlin 8.11: Kotlin types system differentiates between references which can hold null (nullable reference) and which cannot hold null (non null reference). Kotlin Nullable Types and Non-Nullable Types Use of external java code as Kotlin is Java interoperability.An uninitialized of this operator which is available in a constructor passed and used somewhere.An forcefully call to throw NullPointerException().NullPointerException can only possible on following causes: Kotlin's type system is aimed to eliminate NullPointerException form the code. Kotlin compiler throws NullPointerException immediately if it found any null argument is passed without executing any other statements. Kotlin null safety is a procedure to eliminate the risk of null reference from the code.
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