January 2017
Intermediate to advanced
420 pages
9h 25m
English
Content preview from Programming KotlinBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Basic types
One of the big changes in Kotlin from Java is that in Kotlin everything is an object. If you come from a Java background, then you will already be aware that in Java there are special primitive types which are treated differently from objects. They cannot be used as generic types, do not support method/function calls, and cannot be assigned null. An example is the primitive type boolean.
Java introduced wrapper objects to offer a work around in which primitive types are wrapped in objects, so that java.lang.Boolean wraps a boolean in order to smooth over the distinctions. Kotlin removes this necessity entirely from the language by promoting the primitives to full objects.
Whenever possible, the Kotlin compiler will map basic types back ...
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