Question

Suppose that in a banking system a transfer is carried out in the following way: a transfer object is created to control the interaction, and the two accounts and the amount to be transferred are then passed as parameters to a ‘doTransfer()’ method in the transfer object. Draw a collaboration diagram, based on based on the below object diagram, illustrating this interaction. Draw a sequence diagram showing the same interaction and discuss which is the most suitable diagram in this case.

:Bank withdraw(50) deposii(50) a1 Account a2: Account

Answer 1

Transfer 1. doTransfer(debitAccount, creditAccount, Amount Bank 2. Success/Failure message

Transfer Bank Transfer a1 will be debitAccount, a2 will be creditAccount, Amount is 50 doTransfer(debitAccount, creditAccount, Amount). Success/Failure message

This diagram is at low level. In real life scenarios, transaction will happen in a different way.

You will have a object of Transaction/Account/User and those objects will contain data about debitAccount, creditAccount, amount, transactionId, message etc...