如何在不参考规范的情况下在命令行上获取 -xx 支持的所有参数的列表？
java -X
-Xmixed mixed mode execution (default)
-Xint interpreted mode execution only
-Xbootclasspath:<directories and zip/jar files separated by :>
set search path for bootstrap classes and resources
-Xbootclasspath/a:<directories and zip/jar files separated by :>
append to end of bootstrap class path
-Xbootclasspath/p:<directories and zip/jar files separated by :>
prepend in front of bootstrap class path
-Xdiag show additional diagnostic messages
-Xnoclassgc disable class garbage collection
-Xincgc enable incremental garbage collection
-Xloggc:<file> log GC status to a file with time stamps
-Xbatch disable background compilation
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size
-Xss<size> set java thread stack size
-Xprof output cpu profiling data
-Xfuture enable strictest checks, anticipating future default
-Xrs reduce use of OS signals by Java/VM (see documentation)
-Xcheck:jni perform additional checks for JNI functions
-Xshare:off do not attempt to use shared class data
-Xshare:auto use shared class data if possible (default)
-Xshare:on require using shared class data, otherwise fail.
-XshowSettings show all settings and continue
-XshowSettings:all
show all settings and continue
-XshowSettings:vm
show all vm related settings and continue
-XshowSettings:system
(Linux Only) show host system or container
configuration and continue
-XshowSettings:properties
show all property settings and continue
-XshowSettings:locale
show all locale related settings and continue
-X 选项是非标准选项，如有更改，恕不另行通知。
例如，可以通过-X来获取这些参数。
我如何获得-XX？有哪些可用参数？