问题
I just heard of the HotSpot JVM, as opposed to the Oracle JRockik JVM. What is Hotspot? Is this old the Sun JVM, or something else?
回答1:
HotSpot is the shipped Sun JVM which has support for just-in-time compilation of heavily used sections of code.
For all practical purposes, it is the "Sun JVM" or now the "Oracle JVM". Note that this is the same JVM which was open sourced, so it is also the "OpenJDK JVM".
Way back when, Sun did release a non-JIT capable JVM, but that's long enough ago that the odds of encountering it are minuscule.
回答2:
AFAIK, its the old Sun JVM which is now part of OpenJDK and therefor a reference for many other implementations.
回答3:
Oracle's JVM is called HotSpot.
来源：https://stackoverflow.com/questions/5747432/what-is-hotspot