![]() LOCALVARIABLE canBeNull Ljava/lang/String L1 元 0Īs we can see, at the bytecode level, there is no difference between a nullable type and a non-nullable type. LOCALVARIABLE nonNull Ljava/lang/String L2 元 1 Val nonNull: String = null // compiler error Below is the code to define a String and a String? val canBeNull: String? = null We will start with the simplest case, null safety with a local nullable variable. The same principle can be applied to any other type. ![]() But at the end of the day, Kotlin code is still compiled into bytecode and runs on the JVM.Īs an example, today we will find out how Kotlin distinguishes between the String and String? types when the JVM only knows of Ljava/lang/String. Kotlin distinguishes between references that can hold null (nullable types) and references that cannot (non-nullable types). One of Kotlin’s improvements over Java is null safety. Normally,types of String are not nullable.Note: phiên bản Tiếng Việt của bài này ở link dưới. 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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