How to design a file system based on java card

I have reviewed all kinds of articles about it.And right now I can not find any source code to do that function.But how to design a full gsm file system using java card.
of course you need fast access,dynamic allocate memory,file properties management.Let's talk about it.

just do it.
there is no such feature in the javacard api. This must be coded by hand, you have to manage memory, etc.
I know, that's not cool.

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