Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition

Defining Generic Types

A generic type is a class that accepts an input of any type in its constructor (though there can be limits on the type, as you will see later in this chapter). You will begin by defining your own generic type.

In NyetHack, create a new Kotlin file called Loot.kt. Within your new file, define a LootBox class that specifies a generic type parameter for use with its contents and contains a private property called contents that is assigned the item.

Listing 18.1  Creating a generic class (Loot.kt)

class LootBox<T>(var contents: T)

You define the LootBox class and make it generic by specifying a generic type parameter for use with the class, written as T and specified within diamond braces (< >) like other ...