Why do we use strategy design pattern?
Use the Strategy pattern when you want to use different variants of an algorithm within an object and be able to switch from one algorithm to another during runtime. Use the Strategy when you have a lot of similar classes that only differ in the way they execute some behavior.
What is context in strategy pattern?
UML class and sequence diagram Instead, Context refers to the Strategy interface for performing an algorithm ( strategy. algorithm() ), which makes Context independent of how an algorithm is implemented. The Strategy1 and Strategy2 classes implement the Strategy interface, that is, implement (encapsulate) an algorithm.
How are design patterns related to strategy pattern?
Design Patterns – Strategy Pattern. In Strategy pattern, a class behavior or its algorithm can be changed at run time. This type of design pattern comes under behavior pattern. In Strategy pattern, we create objects which represent various strategies and a context object whose behavior varies as per its strategy object.
How is the strategy pattern used in Java?
The Strategy pattern lets you extract the varying behavior into a separate class hierarchy and combine the original classes into one, thereby reducing duplicate code. Use the pattern to isolate the business logic of a class from the implementation details of algorithms that may not be as important in the context of that logic.
How are algorithms implemented in a strategy pattern?
Strategy enables the clients to choose the required algorithm, without using a “switch” statement or a series of “if-else” statements. Data structures used for implementing the algorithm are completely encapsulated in Strategy classes. Therefore, the implementation of an algorithm can be changed without affecting the Context class.
What is the strategy design pattern in UML?
The strategy design pattern of a navigation app in UML: The Context receives a command from the app client (GUI button) and applies the necessary strategy. Interaction with the encapsulated strategy algorithms (ConcreteStrategies) takes place via the Strategy interface.