Developers can experiment with the new features and capabilities of the operating system powered by Java SE 8 and Kotlin, I will also touch the new Desugar compiler designed for Java SE 8 support and programming with Java SE 8 syntax; lambda expression, method reference, default methods, Streams... etc.
https://www.slideshare.net/tamanm/android-development-powered-by-java-se-8-and-kotlin