© Peter Späth 2019
Peter SpäthLearn Kotlin for Android Developmenthttps://doi.org/10.1007/978-1-4842-4467-8_14

14. Adding Hints: Annotations

Peter Späth1 
Leipzig, Germany
Annotations are for adding meta-information to your code. What does that mean? Consider the following classes:
class Adder {
    fun add(a:Double, b:Double) = a + b
class Subtractor {
    fun subtract(a:Double, b:Double) = a - b
If we have a larger arithmetic calculation project where the various operations get handled by classes like Adder and Subtractor here, we could have something like
val eng = CalculationEngine()
eng.registerAdder(Adder::class, "add") eng.registerSubtractor(Subtractor::class, "subtract")

for registering the particular low-level operations.

We could, however, ...

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