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🔔 Subscribe to Ram N JavaWhat is the Template Method Design Pattern?
The Template Design Pattern (also called the Template Method Design Pattern) is categorized as a behavioral design pattern. It defines the skeleton of an algorithm in an abstract base class, delegating the execution of specific steps to subclasses without permitting alterations to the algorithm's overarching flow.
In simpler words, think of a template document or a recipe outline. The sequence of actions is locked in place, but individual details can be tailored to meet distinct business requirements.
Core Concepts and Structure
The architecture of this pattern revolves around two central components:
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The Abstract Base Class: Contains the Template Method, which calls individual primitive methods in a specific logical order. It is marked
finalin Java to prevent subclasses from modifying the algorithm sequence. - Concrete Subclasses: Extend the base class and override the abstract primitive steps to supply specific implementation logic for that variant.
Why Use the Template Method Pattern?
Applying the Template Method pattern offers several major benefits for your application architecture:
- Code Reusability: Common workflow logic resides in a single abstract class rather than duplicating boilerplate across multiple classes.
- Inversion of Control: Known as the "Hollywood Principle" ("Don't call us, we'll call you"), the parent class controls execution order, calling child implementations when needed.
- Controlled Extensibility: You decide precisely where extensions are allowed by declaring only certain methods as abstract or overridable hooks.
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| Template Design pattern or Template Method Design pattern - Introduction |
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