Store array of objects in Java Card 2.2.1 platform

Hi all,

I am new to smart card development and developing a demo e-wallet application using Java Card 2.2.1 SDK. I'd like to store last 10 transactions in card and create getter-setter methods. The structure of Transaction that i thought as follow:

public class Transaction {
     private byte type; // + or -
     private short amount;
     private byte[] date;
        ....
}
[Date format: "yyyy-MM-dd HH:mm:ss"]

And transactionList:

public class TransactionList {
     protected short currentIndex = (short) -1;
     protected Transaction [] list = new Transaction [10];
}

In my desktop application i have already called card's selectApplication(); / getBalance(); / setBalance(); / getWalletId(); / setWalletId(); methods. I need to create a method [getLastTransactions] in card project and call it from my desktop application.

<font size="2">How should I set up a structure for this issue?</font>