How do you change a java program to a single file executable file?

Hey guys I'm back with another new to java question :)
i would like to have my java program that i made into an executable single file,
i currently have my project compressed into a JAR file,
and its working fine when i go click on it in the file that its in, it works fine but it has to be in that file to work... :(, i was wondering is there a way that i can have that file on its own to work, so that i can send it to someone and they just have to have that one file.
thanks for the help

If you want a jar file to behave the same way no matter what directory it is in (or is run from) then you have to make sure that all resources it uses are included in the jar. Such resources could include images and sounds that the application uses. Or files that it references.
For instance thisFile foo = new File("foo.txt");is going to name a file that it is in the current directory (the directory the jarred or unjarred application was run from). If you move the jar, but don't move foo.txt then it won't be able to find the file.
Any of your code that directly or indirectly uses files will have to change to use resources within the jar archive instead.
If you get stuck, post some code. Something brief, compilable, runnable which shows what you mean by saying that it doesn't work.

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