How to use files in Jar file

Hi,
I have one program which displays images on main form.
But when I package all these classes and image files it shows file not found.
I want it should read the image files which are in the same jar file.
How can I use the files which are packaged in a Jar file?

Here's some sample code I stole from another website.
public void readTextFromJar(String s) {
String thisLine;
try {
InputStream is = getClass().getResourceAsStream(s);
BufferedReader br = new BufferedReader
(new InputStreamReader(is));
while ((thisLine = br.readLine()) != null) { 
System.out.println(thisLine);
catch (Exception e) {
e.printStackTrace();
}

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