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Java 12

JEP	Name	Category	Summary
230	Microbenchmark Suite	Tools	Add a basic suite of microbenchmarks to the JDK source code, and make it easy for developers to run existing microbenchmarks and create new ones.
325	Switch Expressions (Preview)	Language	Extend the switch statement so that it can be used as either a statement or an expression, and that both forms can use either a "traditional" or "simplified" scoping and control flow behavior. These changes will simplify everyday coding, and also prepare the way for the use of pattern matching (JEP 305) in switch. This is a preview language feature in JDK 12.
189	Shenandoah: A Low-Pause-Time Garbage Collector (Experimental)	Garbage Collector	Add a new garbage collection (GC) algorithm named Shenandoah which reduces GC pause times by doing evacuation work concurrently with the running Java threads. Pause times with Shenandoah are independent of heap size, meaning you will have the same consistent pause times whether your heap is 200 MB or 200 GB.
334	JVM Constants API		Introduce an API to model nominal descriptions of key class-file and run-time artifacts, in particular constants that are loadable from the constant pool.
341	Default CDS Archives		Enhance the JDK build process to generate a class data-sharing (CDS) archive, using the default class list, on 64-bit platforms.
344	Abortable Mixed Collections for G1	Garbage Collector	Make G1 mixed collections abortable if they might exceed the pause target.
346	Promptly Return Unused Committed Memory from G1	Garbage Collector	Enhance the G1 garbage collector to automatically return Java heap memory to the operating system when idle.
340	One AArch64 Port, Not Two	Pruning	Remove all of the sources related to the arm64 port while retaining the 32-bit ARM port and the 64-bit aarch64 port.