urgent guidance required to access image using class navigation

hello , in the program that i am developping, i have to access a list of files within the package of the project. it runs well when i run the program within eclipse but when i export it to a runnable jar, it seems that the path for my image folder changes.
From research i ended with solutions like using Class.getResource
or get ResourceStream
which i have never used before and it seems that i am not being able to implement it.

plz its urgent help my image folder and Class(which call the images) is as follows.
followed by my code extract.

http://s25.postimg.org/fv4mkxazz/location.png

http://s25.postimg.org/df2t72sxb/code_extract.png

plzz help me out, i got to submit an executable jar in less than 5 hours