Firewall packages, caps, and Applet

Hello

I'm new in Java Card technology, and I doubt a thing. I have three Java packages in my school project. My JavaCard applet is placed inside one of them, and this applet uses instances of classes that are placed in the other packages. I don't know if I understand, but the converter will make a PAC file each of my packages (this means three packages)? Can I install all of those packages on JavaCard and how to use them?
It's a bit confusing to me. I'd be firewall to worry since there are different hats?
Or should I place all of these classes within a single package and just install a PAC file that will be generated for the whole package?

Thank you
Neven

Edited by: 847201 the 24.03.2011. 14.55

847201 wrote:
I don't know if I understand, but the converter will make a PAC file each of my packages (this means three packages)?

That is right. For each package referenced by another package, you will also get an EXP file. It is mainly used to connect the packages at the time of the conversion.

Can I install all of those packages on JavaCard and how to use them?

As long you load packages in the correct order for each package that is used in a PAC file is already on the map, there is no difference in your code to use classes. The only difference is that the order of loading must be correct.

It's a bit confusing to me. I'd be firewall to worry since there are different hats?

The firewall of the applet is more for when you have several applet tries to access the same data. There are different requirements for a library package (for example, what can be done in a constructor) so you should read about it in the documentation of JC and the plug. There is overhead to access the instance methods on your class, as the firewall will check to see if there is a change of context that is required. The book Card (TM) Java technology for smart cards: Guide to the Architecture and the programmer has a good article on the firewall of the applet.

Or should I place all of these classes within a single package and just install a PAC file that will be generated for the whole package?

If you do not need to reuse code among different applet that will work as well. If your project becomes too large, you will need to split as there are limits on certain things in the spec FRENCH_TRAVELLER_64 such as the number of classes and methods, etc. When we have reached this limit, we had a significant amount of code, so I doubt that you will hit this limit with a school project.

See you soon,.
Shane

Tags: Java

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