A JAR file is a Java archive and usually includes compiled .java files (classes) in a package-based directory format.
Typically, you want to provide your .java files (java source code) in a format other than jar.
Netbeans
> a > ZIP.
netbeans .
jar Netbeans "dist" netbeans. "" (Ctrl + 2) netbeans . jar , .
. Netbeans: JAR Netbeans