How to store data,key,cert,... in javacard

I'm newbie in javacard
I develop it by use RMI model
I develop to similar EMV specification but don't exactly
EMV spec told me that data element such as KEY, CERT,COUNTER,ExpirationDate,...anything. will be keep in file , with tree structure.
above is not importance
I try to understand: How to save file into javacard?
I read a lot of help and manual from sdk , this website ,forum
and I feel it's impossible to save file (such as text file *.txt, photo file *.jpeg,*.gif) into javacard directly,
Is my understand correct?
I try to understand PhotoCardApplet Demo that come with sdk
run it , have fun with it, try to understand code
I saw the demo bring the pictures file from reader-side save into card to the "Object" of byte[]
Is there just only one way to keep KEY,CERT,..DATA in Object in the applet?
Can it possible to seperate these data away from applet and keep it individual? ( seperate applet , text file ,photo file ,... keep in javacard)
And if it possible plz tell me how to do it with detailed.
thx for every answer.

EMV spec told me that data element such as KEY,
CERT,COUNTER,ExpirationDate,...anything. will be
keep in file , with tree structure.That is the file-system part of an EMV smart card. That has nothing (directly) to do with java cards. Most java cards has a file system part, too but that isn't accessible from within the java card applet.
I try to understand PhotoCardApplet Demo that come
with sdk
run it , have fun with it, try to understand code
I saw the demo bring the pictures file from
reader-side save into card to the "Object" of
byte[]
Is there just only one way to keep KEY,CERT,..DATA
in Object in the applet?
Can it possible to seperate these data away from
applet and keep it individual? ( seperate applet ,
text file ,photo file ,... keep in javacard)
No, loading data into the memory which belongs to your java card applet instance makes the data become a part of the applet. If you delete the applet all stored data will be deleted, too.
You can only separate different objects within your applet by using separate byte-arrays or other java card objects.
Jan

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