On Mon, 21 Oct 2024 09:41:50 GMT, Jan Lahoda <jlah...@openjdk.org> wrote:
>> Currently, running `java` without any parameters will lead to an output that >> is a full `--help`, which is over 100 lines (on my computer at least), and >> it feels overwhelming. And many people might actually want to run >> JShell/REPL, not the `java` launcher, but it is difficult find out about >> JShell. >> >> The proposal herein is to print a much shorter help, together with a pointer >> to JShell, when the launcher does not know what to do. I.e. there is nothing >> specified to start, and no option like `--help` is specified. In particular, >> on my machine, it prints: >> >> openjdk 24-internal 2025-03-18 >> >> Usage: java [java options...] <application> [application arguments...] >> >> Where <application> is one of: >> <mainclass> to execute the main method of a compiled class >> -jar <jarfile>.jar to execute the main class of a JAR archive >> -m <module>[/<mainclass>] to execute the main class of a module >> <sourcefile>.java to compile and execute a source-file program >> >> Where key java options include: >> --class-path <class path> >> a ":"-separated list of directories and JAR archives to search for >> class files >> --module-path <module path> >> a ":"-separated list of directories and JAR archives to search for >> modules >> >> For more details about this launcher: java --help >> For an interactive Java environment: jshell >> >> >> Hopefully, this may be easier both for people trying to run something, and >> for people that are really looking for JShell. >> >> What do you think? >> >> Thanks! > > Jan Lahoda has updated the pull request incrementally with two additional > commits since the last revision: > > - Using lowercase for the keys in the help, using 'source-file' program > instead of 'single-file' program. > - Using an enum instead of booleans, as suggested. I agree! A suuuuper nit-pick is we have three spaces between columns at the end, but two spaces between columns seemed like enough above. Sorry :-) ------------- PR Comment: https://git.openjdk.org/jdk/pull/21411#issuecomment-2427110618
