Template patterns

The template method approach can be used in mass housing construction. The architectural plan for building a standard house may contain several extension points that would let a potential owner adjust some details of the resulting house. Each building step, such as laying the foundation, framing, building walls, installing plumbing and wiring for water and electricity, etc.

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. All races in the game have almost the same types of units and buildings. Therefore you can reuse the same AI structure for various races, while being able to override some of the details.

Adding a new race to the game would require creating a new AI subclass and overriding the default methods declared in the base AI class. Use the Template Method pattern when you want to let clients extend only particular steps of an algorithm, but not the whole algorithm or its structure.

The Template Method lets you turn a monolithic algorithm into a series of individual steps which can be easily extended by subclasses while keeping intact the structure defined in a superclass. Use the pattern when you have several classes that contain almost identical algorithms with some minor differences.

As a result, you might need to modify all classes when the algorithm changes. When you turn such an algorithm into a template method, you can also pull up the steps with similar implementations into a superclass, eliminating code duplication.

Code that varies between subclasses can remain in subclasses. Analyze the target algorithm to see whether you can break it into steps. Consider which steps are common to all subclasses and which ones will always be unique. Consider making the template method final to prevent subclasses from overriding it. However, some steps might benefit from having a default implementation.

For each variation of the algorithm, create a new concrete subclass. It must implement all of the abstract steps, but may also override some of the optional ones.

Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. Computer Graphics. Software Engineering. Web Technology. Cyber Security. C Programming. Control System. Data Mining. Data Warehouse. Javatpoint Services JavaTpoint offers too many high quality services. Benefits: It is very common technique for reusing the code. This is only the main benefit of it. Usage: It is used when the common behavior among sub-classes should be moved to a single common class by avoiding the duplication.

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