JVM-Getting Started Chapter 1

1. Basic concepts

JVM is the abbreviation of Java Virtual Machine. JVM is a specification for computing devices. It is a fictitious computer that is implemented by simulating various computer functions on an actual computer.

2. java -help command

Parameters -d32 Use 32-bit data model (if available)

-d64 Use 64-bit data model (if available)

-server                                                                                                                                                                                                                                                                   Select “server” The default VM is server.

- CP List of directories, JAR archives and ZIP archives separated by ; Used to search for class files.

-D                                                                                                                           Enable verbose output

-version Output Product version and exit

-version:                                                                                                                                                           to be removed in a future release. The specified version is required to run

-Showversion output product version and continue

Jre-RESTRICT-SEARCH | -NO-JRE-RESTRICT-SEARCH warning: This function is out of date and will be deleted in the future release version. Include/exclude user-specific JRE

-? -help in version search                                                                                  Output this help message

-X                                                     Output help for non-standard options -ea[:…|:] -enableassertions[:…|:]                                                                              .

-esa | -enablesystemassertions                                                                                                                                                                         Enable system assertions Load the native proxy library For example, -AgentLib: hprof, see-agentlib: jdwp = Help and -AGENTLIB: hprof = help

-agentpath: [= & lt; option & gt;] Load the proxy library of this machine

-javaagent: [= & lt; option & gt;] Load java programming language agent, see java.lang.Instrument

##-splash: Use the specified image display screen

Usage: java [-options] class [args…]

(execution class)

or java [-options] -jar jarfile [args…]

(execute jar file)

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