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When would you choose to use the strategy pattern instead of the template method pattern?
The difference between the two is that while the strategy pattern allows different implementations to use completely different ways of the achieving the desired outcome, the template method pattern specifies an overarching algorithm (the “template” method) which is be used to achieve the result — the only choice left …
What is the difference between an interface and an abstract class with only abstract methods?
The short answer: An abstract class allows you to create functionality that subclasses can implement or override. An interface only allows you to define functionality, not implement it. And whereas a class can extend only one abstract class, it can take advantage of multiple interfaces.
What is the difference between a template and a pattern?
A template is a master pattern (in word processing a standard sequence of words, phrases or sentences) which is copied by the user, who can normally add something (e.g. someone’s name) to it. A pattern (as used in social security numbers) is a sequence of data that follows a rule.
How is a template method used in a class?
This class defines a template method consisting of a series of calls to various document-processing steps. Template method breaks the algorithm into steps, allowing subclasses to override these steps but not the actual method. At first, we can declare all steps abstract, forcing the subclasses to provide their own implementations for these methods.
Which is the best template method design pattern?
Template Method Design Pattern 1 Intent. Define the skeleton of an algorithm in an operation, deferring some steps to client subclasses. 2 Problem. Two different components have significant similarities, but demonstrate no reuse of common interface or implementation. 3 Discussion. 4 Structure. 5 Example. 6 Check list.
Can a concrete class override a template method?
The Abstract Class declares methods that act as steps of an algorithm, as well as the actual template method which calls these methods in a specific order. The steps may either be declared abstract or have some default implementation. Concrete Classes can override all of the steps, but not the template method itself.
How is template method similar to strategy method?
Strategy is like Template Method except in its granularity. Template Method uses inheritance to vary part of an algorithm. Strategy uses delegation to vary the entire algorithm. Strategy modifies the logic of individual objects. Template Method modifies the logic of an entire class.