make aborting the garbage collection process much more efficient by breaking up the mixed collection group into mandatory and optional parts. eliminate any duplicate work necessary with maintaining two port. 
add a suite of microbenchmarks into the JDK build source code–streamlining the running of existing benchmarks and the creation of new ones. reduce the garbage collection pause times by processing evacuation work while running the Java threads, which means that pause times are consistent regardless of the heap size. boost the JDK build process by creating a class data-sharing archive through a default class list on the 64-bit platform. it will make the coding process easier by extending the switch statement and enabling it to be used as statement or expression. Some of the great benefits you can expect from the new Java 12 features are: 
This latest version offers a list of new features such as Switch Expressions, Default CDS Archives, Shenandoah, Microbenchmark Suite, among others. And by support, we mean the allocation of update releases for bug fixes and critical security patches. The goal is to make new releases more frequent for the Java ecosystem, with certain releases earmarked as long-term support (LTS).
Oracle will soon roll out Java 12 in March 2019 and new releases will drop once every six months thereafter.
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