java - Is it possible to load different config files on starting .jar? -

my question .jar file. in project use json config file, loaded in .jar file. possible somehow can use different config files ? have project done server/client sockets, , know have many clients, don't want create many client.jar each config file, want use 1 main client.jar , run different config files.

if can't understand i'll try explain in example :

maybe it's possible make custom flag or something?

java -jar -config client.jar example/foo/config.json java -jar -config client.jar example/foo/config2.json 

and on... guess me.. :)

two options here:

1. pass file name argument,
2. pass system property

option 1:

you run jar this:

java -jar client.jar example/foo/config.json 

and filename in first argument of main(string[] args) method.

option 2:

you run jar this:

java -dconfig=example/foo/config.json -jar client.jar 

and file name calling system.getproperty("config").

the second method have advantage of letting file name available anywhere in program, whereas first on makes available in main method.