title: Packing jar file into exists jar file
body: <p>I'm writing a MP3 player in Java.
  If i will finish I want to pack all <code>.class</code> files in one <code>.jar</code> file. I don't want have player, which starts by console. 
  If i open this one .jar file i want see player window.</p>
  
  <p>I know how to pack it. I must use <code>jar.exe</code> packer with params: <code>cvfm Player.jar MANIFEST.MF ./config/*.class</code> and create <code>MANIEST.MF</code> which content class that has main method. </p>
  
  <p>But the problem is when I want use another Look and Feel, or use existing .jar file. I can put this existing <code>.jar</code> file into my player main dir and compile <code>javac.exe</code> with parameter <code>-cp .;./JarFile.jar</code>, but when I pack all compiled <code>.class</code> files and my existsing <code>JTattooDebug.jar</code> file into one <code>Player.jar</code> file i don't see new Look and Feel i just see default view.</p>