[JAVA] Try to make a cross-platform application with JRuby (jar file generation)

"I want you to make an app that works on both Windows and Mac."

Well, whatever the reason, I got these requirements, so I decided to make a Java application. However, I had never made an application in Java before, and when I was wondering what to do, there was something called JRuby, so it was better to use it, so I decided to do so. JRuby? As the name suggests, JRuby seems to be a Java + Ruby language (I don't know the details).

What should have been done

It seems that you can finally make something that works (jar file) by double-clicking the icon.

Create a jar file with JRuby

https://dev.classmethod.jp/etc/jruby_warbler_ruby_source_create_jar/ For the time being, you should be able to follow this procedure.

When I tried it, I was able to go safely

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