Hook Methods
Hook methods are defined in abstract classes and called from a template method. Hooks are used as placeholders that can be supplied by the component's client in a concrete derived class. Here is a Java example:
/** */ public abstract class Beverage implements Beveragelike { /** * Adds condiments to the beverage */ public abstract void addCondiments; /** * Hook method that determines whether the customer wants condiments * or not. Can be overridden. * @return true, if the customer wants condiments, and false otherwise. */ public boolean customerWantsCondiments { return true; } /** * Prepares the beverage according to this recipe. */ public final void prepareRecipe { // … if (customerWantsCondiments) { addCondiments; } } }Read more about this topic: Method (computer Programming)
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—Ralph Waldo Emerson (1803–1882)
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