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.
abstract class AbstractFruitBox<A, B, C, D>(
val firstItem: A,
val secondItem: B,
val numOfItems: C,
val totalCost: D
) {
}
abstract fun calculateTotalCost(): Double
fun printContents() {
println("FruitBox contents: First Item = $firstItem, Second Item = $secondItem")
println("Total Items = $numOfItems, Total Cost = $$totalCost")
}
class AppleBananaBox(firstItem: String, secondItem: String, numOfItems: Int, totalCost: Double) :
AbstractFruitBox<String, String, Int, Double>(firstItem, secondItem, numOfItems, totalCost) {
}
override fun calculateTotalCost(): Double {
return numOfItems.toDouble() * totalCost
}
val appleBananaBox = AppleBananaBox("Apple", "Banana", 5, 10.5)
appleBananaBox.printContents()
println("Total Cost: $${appleBananaBox.calculateTotalCost()}")
class DefaultFruitBox(firstItem: String, secondItem: String, numOfItems: Int, totalCost: Double) :
AbstractFruitBox<String, String, Int, Double>(firstItem, secondItem, numOfItems, totalCost) {
override fun calculateTotalCost(): Double {
return totalCost
}
}
class SaleFruitBox(firstItem: String, secondItem: String, numOfItems: Int, totalCost: Double, val discountPercent: Double) :
AbstractFruitBox<String, String, Int, Double>(firstItem, secondItem, numOfItems, totalCost) {
override fun calculateTotalCost(): Double {
val discountedCost = totalCost * (1 - discountPercent / 100)
return discountedCost
}
}
val defaultFruitBox = DefaultFruitBox("Orange", "Grapes", 10, 15.0)
val saleFruitBox = SaleFruitBox("Watermelon", "Pineapple", 3, 20.0, 10.0)
appleBananaBox.printContents()
println("Total Cost (AppleBananaBox): $${appleBananaBox.calculateTotalCost()}")
defaultFruitBox.printContents()
println("Total Cost (DefaultFruitBox): $${defaultFruitBox.calculateTotalCost()}")
saleFruitBox.printContents()
println("Total Cost (SaleFruitBox): $${saleFruitBox.calculateTotalCost()}"