How to invike methods in wallet application?

Hi All,
I am trying to run my first application wallet and understanding javacard technology , i have set up development kit 2.2 successfully . After building and running i have checked expected out file it show same result.
But how to invoke different method in the application like GetBalance,Debit ,Credit ,Select ,verify etc in order to understand how it works ?
Is any GUI Simulator available where i can deploy application to understands technology.
Thanks

To invoke the methods of Wallet Applet, They need to be called by APDU commands
e.g:
// It invokes the verify method
0xB0 0x20 0x00 0x00 0x05 0x01 0x02 0x03 0x04 0x05 0x7F;
// It invokes the getBalance method
0xB0 0x50 0x00 0x00 0x00 0x02;
// It invokes the debit method
0xB0 0x40 0x00 0x00 0x01 0x64 0x7F;
// It invokes the credit method
0xB0 0x30 0x00 0x00 0x01 0x64 0x7F;
And in the method process(APDU apdu) you have to have this:
switch (buffer[ISO7816.OFFSET_INS]) {
case GET_BALANCE: // 0x50
     getBalance(apdu);
     return;
case DEBIT: // 0x40
     debit(apdu);
     return;
case CREDIT: //0x30
     credit(apdu);
     return;
case VERIFY: //0x20
     verify(apdu);
     return;
default:
     ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
Regards,
Marcos

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