Advanced Kotlin Class Features
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Open your internet browser and search for Kotlin Playground. You’ll see different websites. Select the one provided by the Android Developers page. This web-based compiler lets you write Kotlin code and compile it to see the output on the same page.
class FruitBox<A, B, C, D>(
val firstItem: A,
val secondItem: B,
val numOfItems: C,
val totalCost: D
) {
fun printContents() {
println("FruitBox contents: First Item = $firstItem, Second Item = $secondItem")
println("Total Items = $numOfItems, Total Cost = $$totalCost")
}
}
fun main() {
val appleBananaBox = FruitBox("Apple", "Banana", 5, 10.5)
appleBananaBox.printContents()
}
companion object {
const val BOX_CAPACITY = 10
fun getDefaultBox(): FruitBox<String, String, Int, Double> {
return FruitBox("Apple", "Banana", 8, 14.2)
}
}
println("\nCalling Companion Object")
println("Box Capacity: ${FruitBox.BOX_CAPACITY}")
val defaultBox = FruitBox.getDefaultBox()
defaultBox.printContents()