July 2018
Intermediate to advanced
400 pages
12h 14m
English
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, First Edition
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Delaying Initialization
Wherever it is declared, a class property must be initialized when the class instance is constructed. This rule is an important part of Kotlin’s null safety system, because it means that all non-nullable properties of a class are initialized with a non-null value when the constructor for that class is called. When you instantiate an object, you can immediately reference any property on that object, from within or outside of the class.
Despite its importance, you can bend this rule. Why would you? You do not always have control over how or when a constructor is called. One such case is in the Android framework.
Late initialization
On Android, a class called Activity represents a screen in your application. ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.