Dalvik is a Java runtime implementation (well technically not but let's keep things simple) just like OpenJDK's hotspot; It compiles bytecode to machine languag

Dalvik is a Java runtime implementation (well technically not but let's keep things simple) just like OpenJDK's hotspot; It compiles bytecode to machine language which your device (PC, smartphone, etc.) can execute. Bytecode is the thing the Java compiler produces (class files) from your Java source code. Android N only switched to the Java API (base classes) of OpenJDK. As far as I know they didn't switch runtime environment. (I know dalvik technically doesn't run bytecode but some other form of intermediary code optimized for mobile devices. I sidestepped that to keep things simple)