Beginning Java Programming: The object-oriented approach [PDF]

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Beginning Java Programming: The object-oriented approach – Book

In conclusion, the typical pattern is a very powerful one, and it allows you to create your own object-oriented paradigm inside an existing one (object‐oriented inception). Some warning, however—you will have noticed that this pattern is especially useful when you’re dealing with shared data, that is, a list of properties for product types.

Note that this pattern’s implementation will change a bit when you know upfront what the set of properties will be. In that case, just implement this as follows:

➤ The fields you want to change at runtime can be implemented as fields in the class (Product, for instance). Fields that are not necessary for a certain product can be set to null.

➤ The fields that are determined by the type are implemented as fields in the type class and set at construction or by setters (e.g., in ProductType). Getters are added to the original class (Product) to fetch information from the type class (ProductType), or the type object is directly exposed (getProductType() in Product).