JVM中的-，-X参数和-XX参数之间有什么区别?

问题描述

JVM有很多参数.有些以-开头，例如-server，-client.有些以-X开头，例如-Xms，-Xmx.有些以-XX开头，例如-XX:PermSize，-XX:UseParallelGC.

There are lots of parameters for JVM. Some start with -, such as -server, -client. Some start with -X, such as -Xms, -Xmx. Some start with -XX, such as -XX:PermSize, -XX:UseParallelGC.

这是我的问题.由于这些参数没有重复，为什么要以这么多不同的前缀开头?为什么不只使用-".我的猜测是有某种标准. -XX参数是扩展设置，并非所有JVM impls都支持.是这样吗?

So here is my question. Since these parameters are not duplicated, why start with so many different prefix? Why not just use "-". My guess is there are some kind of standards for this. The -XX parameters are extension settings and not supported by all JVM impls. Is that so?

推荐答案

是的，它的支持级别.将来的版本中支持普通(-")选项，并且不支持X.此外，不建议您随意使用XX"选项.

Yeah, its the level of support. The vanilla ("-") options are supported in future versions, and the X are not supported. Further, the XX options are "not recommended for casual use".

有关示例，请参阅IBM的JVM文档: http://publib.boulder.ibm.com/infocenter/javasdk/v6r0/index.jsp?topic=%2Fcom.ibm .java.doc.user.aix64.60％2Fdiag％2Fappendixes％2Fcmdline％2Fcommands_jvm.html

For an example, see IBM's JVM documentation: http://publib.boulder.ibm.com/infocenter/javasdk/v6r0/index.jsp?topic=%2Fcom.ibm.java.doc.user.aix64.60%2Fdiag%2Fappendixes%2Fcmdline%2Fcommands_jvm.html

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