Modeling and Responsibility

Question

Suppose you want to create a bank account model in your application. You can create a BankAccount class that does what a typical bank account does. But if you are asked what is the responsibility of the class, what is the answer? "Behavior as a bank account?" This is not very specific. I am a little confused by the relationship between model and responsibility. Many real-world objects do not seem to have a clear responsibility.

What is the best way to start modeling such concepts and keep clearly defined responsibilities?

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  • can issue a check from his account
  • may transfer amounts to other accounts.
  • can pay bills.
  • can get his salary credited to the account
  • can get overdrafts
• Belongs to a jar that may
  • Use your account as a tool to track cash and account transactions.
  • stores and maintains all information about the account and money.
  • restricts access to the account holder and ensures the security of their money.
  • and etc.

amuses
-sundar