If you have the Java Runtime Environment installed, and the JAR file is executable, it should open with a double-click. Sometimes, you might see a pop-up to choose which app to run the file.

Each installation of the Java Development Kit (JDK) includes a JAR utility (named jar.sh on Unix and jar.exe on Windows) that provides a variety of helpful functions for working with JAR files, ...

JEP 458, Launch Multi-File Source-Code Programs, has been Closed/Delivered for JDK 22. This JEP proposes to enhance the Java Launcher to execute an application supplied as one or more files of ...