09VO5### Strategy Pattern
Image: capex.com
The strategy pattern defines a family of interchangeable strategies and sets make it possible for the client to select and use one of them without needing to know others.
Usage
Use the strategy pattern when:
- You want to define a family of interchangeable algorithms (strategy) to reuse in various contexts (concrete strategy).
- You want to avoid tightly coupling an algorithm with its client, making the code more flexible and reusable.
- You want to design classes that can vary the way they perform an operation at runtime.
Structure
- Strategy (interface / abstract class): Defines the interface for the strategies to follow. Declares a method that all strategies must implement.
- Concrete Strategy: Implement the strategy interface. Each concrete strategy implements a specific algorithm to accomplish the desired task.
- Context: Uses a strategy to perform an operation. It has a reference to a strategy and delegates the request to the strategy.
Implementation
- Define the strategy interface that declares a method for the algorithm.
- Create concrete strategy classes that implement the strategy interface.
- Create a context class that has a reference to a strategy.
- Set the strategy for the context class to use the desired concrete strategy.
- Use the context class to perform the desired operations.
Benefits
- Encapsulates algorithms: Allows to group related algorithms into their own objects, making it easier to manage and maintain them.
- Decouples client from strategy: Enables clients to be independent of the implementation, making them more flexible and easier to modify.
- Promotes algorithm extensibility: Makes it easy to add new algorithms without changing the client or other strategies.
- Improves code readability: Isolates the algorithm logic into separate classes, making the codebase more structured and comprehensible.
- Enables runtime adaptability: Allows clients to select and change the strategy dynamically at runtime, providing flexibility in behavior.
Image: techcrunch.com
Options Trading Free Andriod Apps
Image: www.thetechedvocate.org
