How to make an executable jar file?

[Dr.FrechChinese 3]

i want to know how because when i launched some mod by clicking the .exe file, it won't launch but when i use the executable jar file it launched. Thanks

[Tortello 34]

idk bro am so sad because when i try to run Addon nothing happens, when i use a .jar file it always works, but if i copy and paste a .jar file(AOI, for example,)it gives me an error message.