Execution of Java codes

Question

1) We know many webpages use Java on the back end....
2) Many apps, for both computers and mobiles use Java ....

Well how do the executive themselves with out JVM & all those ?

Answer 1

You cannot execute Java apps without JRE.

Answer 2

I'm not sure but maybe you can make exe file and run it without JRE. https://www.excelsiorjet.com

Answer 3

with the help of jar files and war files we will do that