Workshop Converting Java to Kotlin Corneil du Plessis @corneil Bring your own code. 

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Agenda • Brief overview of Kotlin • Converting Ping Pong TDD – Roman Numerals, more... • Bring your own code. • Questions and Discussions • Java Interoperability • Interesting language features 

Kotlin Overview • Improve readability • Reduce cognitive load • Functional and Object Oriented • Immutability 

Kotlin – Functional and Object-Oriented 

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Kotlin – Functional and Object-Oriented 

Kotlin – Data Class 

Kotlin - Functions 

Kotlin – Scope functions Name Invocation It / this Lambda result or object let receiver.let {} it {} with with(receiver) {} this {} run receiver.run {} this {} apply receiver.apply {} this receiver also receiver.also {} it receiver 

Converting code • Converting Ping Pong TDD • Strap in.... 

Converting – Add dependencies 

Kotlin – Maven Dependencies 

Kotlin – Maven Plugins • https://gist.github.com/corneil/fdbac43fbc2b0909ea0cb6a0d0fd146a 

Kotlin – Maven Plugin 

Kotlin – Maven Java Plugin configuration 

Interesting Kotlin features – Java interoperability • @JvmName • @get:JvmName • @set:JvmName • @JvmStatic • @JvmField • @JvmOverloads • @JvmDefault • @Throws • @JvmSuppressWildcards • @JvmMultifileClass 

Kotlin - @JvmOverloads 

Kotlin - Destructuring Declarations 

Kotlin – Delegated Properties • lazy • Non-Primitives. • notNull • Primitives • observable • Lambda is invoked when modified • vetoable • Lambda can prevent an update by returning false 

Kotlin –Delegated Properties 

Kotlin - Delegation 

Resources • Kotlin https://kotlinlang.org/ • Kotlin Reference https://kotlinlang.org/docs/reference/ • Kotlin Playground https://play.kotlinlang.org/ • Tutorials https://kotlinlang.org/docs/tutorials/ • More https://kotlinlang.org/docs/resources.html • Awesome Kotlin https://kotlin.link/