jdeps工具在Java 9中的重要性是什么？

jdeps是一个Java类依赖分析工具，它是一个命令行工具，用于显示给定Java类文件的包级别或类级别依赖关系。输入的类可以是一个.class文件的路径名，一个目录，一个jar文件，或者是一个完全限定的类名来分析所有的类文件。

"jdeps"自jdk 8以来已经包含在jdk安装中，并且它由"%java_home%binjdeps.exe"程序文件表示。如果我们在"path"环境变量中包含了"%java_home%bin"目录，我们将运行"jdeps --help"命令以查看所有选项的完整列表。

下面，我们可以通过使用"jdeps --help"命令来查看选项列表。

C:\Program Files\Java\jdk-9.0.4>jdeps --help
Usage: jdeps <options> <path ...>]
<path> can be a pathname to a .class file, a directory, a JAR file.

Possible options include:
  -dotoutput <dir>
  --dot-output <dir>      Destination directory for DOT file output
  -s        -summary      Print dependency summary only.
  -v        -verbose      Print all class level dependences
                          Equivalent to -verbose:class -filter:none.
  -verbose:package        Print package-level dependences excluding
                          dependences within the same package by default
  -verbose:class          Print class-level dependences excluding
                          dependences within the same package by default
  -apionly
  --api-only              Restrict analysis to APIs i.e. dependences
                          from the signature of public and protected
                          members of public classes including field
                          type, method parameter types, returned type,
                          checked exception types etc.
  -jdkinternals
  --jdk-internals         Finds class-level dependences on JDK internal
                          APIs. By default, it analyzes all classes
                          on --class-path and input files unless -include
                          option is specified. This option cannot be
                          used with -p, -e and -s options.
                          WARNING: JDK internal APIs are inaccessible.
--check <module-name>[,<module-name>...
                          Analyze the dependence of the specified modules
                          It prints the module descriptor, the resulting
                          module dependences after analysis and the
                          graph after transition reduction. It also
                          identifies any unused qualified exports.
  --generate-module-info <dir>
                          Generate module-info.java under the specified
                          directory. The specified JAR files will be
                          analyzed. This option cannot be used with
                          --dot-output or --class-path. Use
                          --generate-open-module option for open modules.
  --generate-open-module <dir>
                          Generate module-info.java for the specified
                          JAR files under the specified directory as
                          open modules. This option cannot be used with
                          --dot-output or --class-path.
  --list-deps             Lists the dependences and use of JDK internal APIs.
  --list-reduced-deps     Same as --list-deps with not listing
                          the implied reads edges from the module graph
                          If module M1 depends on M2 and M3,
                          M2 requires public on M3, then M1 reading M3 is
                          implied and removed from the module graph.
  -cp <path>
  -classpath <path>
  --class-path <path>     Specify where to find class files
  --module-path <module path>
                          Specify module path
  --upgrade-module-path <module path>
                          Specify upgrade module path
  --system <java-home>    Specify an alternate system module path
  --add-modules <module-name>[,<module-name>...]
                          Adds modules to the root set for analysis
  -m <module-name>
  --module <module-name>  Specify the root module for analysis
  --multi-release <version>
                          Specifies the version when processing
                          multi-release jar files. should
                          be integer >= 9 or base.

Options to filter dependences:
  -p <pkg>
  -package <pkg>
  --package <pkg>           Finds dependences matching the given package
                            name (may be given multiple times).
  -e <regex>
  -regex <regex>
  --regex <regex>           Finds dependences matching the given pattern.
  --require <module-name>   Finds dependences matching the given module
                            name (may be given multiple times). --package,
                            --regex, --require are mutual exclusive.
  -f <regex> -filter <regex> Filter dependences matching the given
                             pattern. If given multiple times, the last
                             one will be used.
  -filter:package            Filter dependences within the same package.
                             This is the default.
  -filter:archive            Filter dependences within the same archive.
  -filter:module             Filter dependences within the same module.
  -filter:none               No -filter:package and -filter:archive
                             filtering. Filtering specified via the
                             -filter option still applies.


Options to filter classes to be analyzed:
  -include <regex>           Restrict analysis to classes matching pattern
                             This option filters the list of classes to
                             be analyzed. It can be used together with
                             -p and -e which apply pattern to the dependences

  -P         -profile        Show profile containing a package
  -R         -recursive      Recursively traverse all run-time dependences.
                             The -R option implies -filter:none. If -p,
                             -e, -f option is specified, only the matching
                             dependences are analyzed.
  -I          --inverse      Analyzes the dependences per other given options

                             and then find all artifacts that directly
                             and indirectly depend on the matching nodes.
                             This is equivalent to the inverse of
                             compile-time view analysis and print
                             dependency summary. This option must use
                             with --require, --package or --regex option.
  --compile-time             Compile-time view of transitive dependences
                             i.e. compile-time view of -R option.
                             Analyzes the dependences per other given options
 
                             If a dependence is found from a directory,
                             a JAR file or a module, all c*lasses in that
                             containing archive are analyzed.
  -q           - quiet       Do not show missing dependences from
                             --generate-module-info output.
  -version     --version     Version information

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