Download A Study of the Third Volume of the Bhavanakrama of by 一郷 正道; イチゴウ マサミチ; Ichigo Masamichi PDF

By 一郷 正道; イチゴウ マサミチ; Ichigo Masamichi

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3. " 4. The Teller object asks the BankRecords object for an empty WithdrawalSlip. This object will be an instance of some class that implements the Wi thdrawalSlip interface and will be passed from the BankRecords object to the Teller object by value, using RMI. That's important. class file) comes across the wire along with the object itself, so the Teller has no way of determining how the object will actually process the messages sent to it. This abstraction is a good thing because it lets you change the way that the Wi thdrawalSlip object works without having to change the Teller definition.

Fine-grained operations. A coarse-grained operation asks an object to do a lot of work. A fine-grained operation asks the object to do only a small amount of work. Generally, I prefer coarse-grained methods because they simplify the code and eliminate the need for most getter and setter methods. Accessor and mutator methods end up in the model because, without a well-thought -out dynamic model to work with, you're only guessing how the objects of a class will be used. Consequently, you need to provide as much access as possible, because you can't predict whether you'll need it.

The basic issues are as follows: • The maintainability of a program is inversely proportional to the amount of data that flows between objects. • Exposing implementation harms maintainability. Make sure that the accessor or mutator really is required before you add it. • Classes that directly model the system at the domain level, sometimes called business objects, hardly ever need accessors or mutators. You can think of the program as partitioned broadly into generic libraries that have to relax the no-getter/no-setter rule and domain-specific classes that should fully encapsulate their implementation.

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