How to create a jar file of our project (In Java) in Java language by which we can make our app one-time clickable software?

If you have a eclipse IDE or Netbeans you  simply go. 

file --Export--java---Runnable Jar select project then browse export destination after that .jar file will create.

on your ECLIPSE IDE  Right click on project-->export -->java-->Executable Jara file. The option will create a executable jar file

If you are on eclipse IDE, than it is a simple task. 

Right click on Project --> Export-->java-->Runnable Jar

above option will create a single click executable jar,provided that JDK installation is required.

Hii..I made my project into a Jar File And AAR file.

If you are using Eclipse or android studio, just simpliy make project without and class or any other Activity .

Now once your project created now click on main folder and goto new in this new click only module part, and choose .jar/.aar type of module .

now do all your coding in this module. all resoures put here, all type of work do here.

After you finish your work now build  project into "make project ''app' " part .

now you have your jar/aar file .

now goto your project location in this you see projectname folder .goto in it and you see build folder now click build folder and goto output folder now you can see your .jar/.aar file.

Hope the answer.