        : JR  JD.
JD -        .
JR -  ZIP ,    .     ZIP .
        :
1. MANIFEST.MF,      META-INF.      .       "  ?".
2.    .class (a.class, b.class  .).    .     ,      .       ".class ".
3. .      BMP  PNG ,     .       " ".
4. .     .     MID  AMR.    "".
5. 3D .     3D .    M3G,      .

 ...        .