[Duda] dudas en instalación

java : C:\Users\escritorio>java Usage: java [options] <mainclass> [args...] (to execute a class) or java [options] -jar <jarfile> [args...] (to execute a jar file) or java [options] -m <module>[/<mainclass>] [args...] java [options] --module <module>[/<mainclass>] [args...] (to execute the main class in a module) or java [options] <sourcefile> [args] (to execute a single source-file program) Arguments following the main class, source file, -jar <jarfile>, -m or --module <module>/<mainclass> are passed as the arguments to main class. where options include: -cp <class search path of directories and zip/jar files> -classpath <class search path of directories and zip/jar files> --class-path <class search path of directories and zip/jar files> A ; separated list of directories, JAR archives, and ZIP archives to search for class files. -p <module path> --module-path <module path>... A ; separated list of directories, each directory is a directory of modules. --upgrade-module-path <module path>... A ; separated list of directories, each directory is a directory of modules that replace upgradeable modules in the runtime image --add-modules <module name>[,<module name>...] root modules to resolve in addition to the initial module. <module name> can also be ALL-DEFAULT, ALL-SYSTEM, ALL-MODULE-PATH. --enable-native-access <module name>[,<module name>...] modules that are permitted to perform restricted native operations. <module name> can also be ALL-UNNAMED. --list-modules list observable modules and exit -d <module name> --describe-module <module name> describe a module and exit --dry-run create VM and load main class but do not execute main method. The --dry-run option may be useful for validating the command-line options such as the module system configuration. --validate-modules validate all modules and exit The --validate-modules option may be useful for finding conflicts and other errors with modules on the module path. -D<name>=<value> set a system property -verbose:[class|module|gc|jni] enable verbose output for the given subsystem -version print product version to the error stream and exit --version print product version to the output stream and exit -showversion print product version to the error stream and continue --show-version print product version to the output stream and continue --show-module-resolution show module resolution output during startup -? -h -help print this help message to the error stream --help print this help message to the output stream -X print help on extra options to the error stream --help-extra print help on extra options to the output stream -ea[:<packagename>...|:<classname>] -enableassertions[:<packagename>...|:<classname>] enable assertions with specified granularity -da[:<packagename>...|:<classname>] -disableassertions[:<packagename>...|:<classname>] disable assertions with specified granularity -esa | -enablesystemassertions enable system assertions ...

javac

C:\Users\escritorio>javac
Usage: javac <options> <source files>
where possible options include:
  @<filename>                  Read options and filenames from file
  -Akey[=value]                Options to pass to annotation processors
  --add-modules <module>(,<module>)*
        Root modules to resolve in addition to the initial modules, or all modules
        on the module path if <module> is ALL-MODULE-PATH.
  --boot-class-path <path>, -bootclasspath <path>
        Override location of bootstrap class files
  --class-path <path>, -classpath <path>, -cp <path>
        Specify where to find user class files and annotation processors
  -d <directory>               Specify where to place generated class files
  -deprecation
        Output source locations where deprecated APIs are used
  --enable-preview
        Enable preview language features. To be used in conjunction with either -source or --release.
  -encoding <encoding>         Specify character encoding used by source files
  -endorseddirs <dirs>         Override location of endorsed standards path
  -extdirs <dirs>              Override location of installed extensions
  -g                           Generate all debugging info
  -g:{lines,vars,source}       Generate only some debugging info
  -g:none                      Generate no debugging info
  -h <directory>
        Specify where to place generated native header files
  --help, -help, -?            Print this help message
  --help-extra, -X             Print help on extra options
  -implicit:{none,class}
        Specify whether or not to generate class files for implicitly referenced files
  -J<flag>                     Pass <flag> directly to the runtime system
  --limit-modules <module>(,<module>)*
        Limit the universe of observable modules
  --module <module>(,<module>)*, -m <module>(,<module>)*
        Compile only the specified module(s), check timestamps
  --module-path <path>, -p <path>
        Specify where to find application modules
  --module-source-path <module-source-path>
        Specify where to find input source files for multiple modules
  --module-version <version>
        Specify version of modules that are being compiled
  -nowarn                      Generate no warnings
  -parameters
        Generate metadata for reflection on method parameters
  -proc:{none,only}
        Control whether annotation processing and/or compilation is done.
  -processor <class1>[,<class2>,<class3>...]
        Names of the annotation processors to run; bypasses default discovery process
  --processor-module-path <path>
        Specify a module path where to find annotation processors
  --processor-path <path>, -processorpath <path>
        Specify where to find annotation processors
  -profile <profile>
        Check that API used is available in the specified profile
  --release <release>
        Compile for the specified Java SE release. Supported releases: 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
  -s <directory>               Specify where to place generated source files
  --source <release>, -source <release>
        Provide source compatibility with the specified Java SE release. Supported releases: 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
  --source-path <path>, -sourcepath <path>
        Specify where to find input source files
  --system <jdk>|none          Override location of system modules
  --target <release>, -target <release>
        Generate class files suitable for the specified Java SE release. Supported releases: 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19
  --upgrade-module-path <path>
        Override location of upgradeable modules
  -verbose                     Output messages about what the compiler is doing
  --version, -version          Version information
  -Werror                      Terminate compilation if warnings occur

me sale lo mismo...

Hola Julie, un gusto saludarte.

Con respecto al punto a, si te sale correctamente lo que veo en las imagenes, es que la intalación del JDK se instalo correctamente. Realmente no afectara a tu proceso de codificación en un futuro, no te preocupes.

En el punto b, tengo igual que ti y no he tenido problemas. Además en mi caso no he modificado mi PATH y ninguna variable de entorno.

Te recomiendo una vez instales tu IDE, escojas la ruta donde esta tu JDk, para que compile de manera correcta. Por lo general se encuentra en Disco local C, despues archivos de programa, la carpeta java, abres el jdk y copias la ruta.

Espero te haya ayudado, cualquier inquietud estare atento.