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<Exceptional Java - Exception design relativity ⁄ >




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Designing the error path in the code is not the most entertaining part of a programmer's job. We are focused on coding the solution, the success path, and the damn exceptions stand in the way pretending to be handled. What makes it even harder and murkier is the lack of well established rules for what constitutes an exception and how to decide what kind of exception each one is: checked vs unchecked. And this decision is haunting because whatever you decide will influence the handling policy in the client code.

Let's look at a very simple and trivial example and try to decide what to do exception wise.

In a banking system, simplifying to extreme, we will probably have some kind of Account class. And the interface of the account class might have a transferFunds method that could look like this:



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