命令行如何来识别这个java命令？ [英] How come command line isn't recognizing this java command?

问题描述

我输入 java -classpath C：\blahblahblah\software_engineering\cs2.jar 作为建议的一部分：为什么我的IDE找到JAR，但我的命令行不'

I enter java -classpath C:\blahblahblah\software_engineering\cs2.jar as part of a suggestion here: Why does my IDE find the JAR but my command line doesn't? .

我确定这是一个有效的命令，但我收到这个累了的列表：

I'm pretty sure this is a valid command, but I instead receive this tired list:

Usage: java [-options] class [args...]
           (to execute a class)
   or  java [-options] -jar jarfile [args...]
           (to execute a jar file)

where options include:
    -server       to select the "server" VM
    -hotspot      is a synonym for the "server" VM  [deprecated]
                  The default VM is server.

    -cp <class search path of directories and zip/jar files>
    -classpath <class search path of directories and zip/jar files>
                  A ; separated list of directories, JAR archives,
                  and ZIP archives to search for class files.
    -D<name>=<value>
                  set a system property
    -verbose[:class|gc|jni]
                  enable verbose output
    -version      print product version and exit
    -version:<value>
                  require the specified version to run
    -showversion  print product version and continue
    -jre-restrict-search | -jre-no-restrict-search
                  include/exclude user private JREs in the version search
    -? -help      print this help message
    -X            print help on non-standard options
    -ea[:<packagename>...|:<classname>]
    -enableassertions[:<packagename>...|:<classname>]
                  enable assertions
    -da[:<packagename>...|:<classname>]
    -disableassertions[:<packagename>...|:<classname>]
                  disable assertions
    -esa | -enablesystemassertions
                  enable system assertions
    -dsa | -disablesystemassertions
                  disable system assertions
    -agentlib:<libname>[=<options>]
                  load native agent library <libname>, e.g. -agentlib:hprof
                    see also, -agentlib:jdwp=help and -agentlib:hprof=help
    -agentpath:<pathname>[=<options>]
                  load native agent library by full pathname
    -javaagent:<jarpath>[=<options>]
                  load Java programming language agent, see java.lang.instrument

    -splash:<imagepath>
                  show splash screen with specified image

如何做？

推荐答案

你给它一个类路径，但不是要执行的类的名称。您也只有 ，包括类路径上的jar文件，而不是包含类文件的目录。

You're giving it a classpath, but not the name of the class to execute. You're also only including the jar file on your classpath - not the directory containing your class file.

其他问题：

java -cp .;cs2.jar CB

（从包含 CB.class 和 cs2.jar 。）

(Run from the directory containing both CB.class and cs2.jar.)

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