how can i change data of a file which is present in that package?(in java, how to get outputStream of that file?)

how can i change data of a file which is present in that package?(in java,
how to get outputStream of that file?)

i've used ResorceLoder class to get input stream but how can i get
outputStream, is this possible to modify data which is in that package?(i
need to change the image files which are present in that package using
java class which is present in the same jar file)