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Kotlin Programming: The Big Nerd Ranch Guide, First Edition
book

Kotlin Programming: The Big Nerd Ranch Guide, First Edition

by Josh Skeen, David Greenhalgh
July 2018
Intermediate to advanced content levelIntermediate to advanced
400 pages
12h 14m
English
Big Nerd Ranch Guides
Content preview from Kotlin Programming: The Big Nerd Ranch Guide, First Edition

The Kotlin Type Hierarchy

Every class in Kotlin descends from a common superclass, known as Any, without you having to explicitly subclass it in your code (Figure 14.2).

Figure 14.2  TownSquare type hierarchy

TownSquare type hierarchy

For example, a Room and a Player are both implicitly children of Any, which is why you can define functions that will accept either of them as parameters. If you have worked with Java, this is similar to how classes in Java subclass the java.lang.Object class implicitly.

Consider the following example of a function called printIsSourceOfBlessings. printIsSourceOfBlessings takes in an argument of type Any and uses ...

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Publisher Resources

ISBN: 9780135165188