What is the difference between strategy design pattern and State Design pattern?

The difference simply lies in that they solve different problems: The State pattern deals with what (state or type) an object is (in) — it encapsulates state-dependent behavior, whereas. the Strategy pattern deals with how an object performs a certain task — it encapsulates an algorithm.

How does strategy design pattern work?

The Strategy pattern lets you indirectly alter the object’s behavior at runtime by associating it with different sub-objects which can perform specific sub-tasks in different ways. Use the Strategy when you have a lot of similar classes that only differ in the way they execute some behavior.

What is the difference between Strategy and command pattern?

The main difference is , the command does some action over the object. It may change the state of an object. While Strategy decides how to process the object. It encapsulates some business logic.

Can Factory pattern be used with strategy pattern?

When a Strategy design pattern is implemented, such code to use the appropriate implementation class is always required. A Factory class can create new instances in a multithreaded application. Thus, the Strategy design pattern should always be implemented with Factory Method design pattern.

When comparing the state pattern and the Strategy pattern which of the following represents a difference?

State pattern helps object to manage state, while Strategy pattern allows client to choose different behaviour. Another difference, which is not easily visible is, who drives change in behaviour.

What is the difference between Strategy pattern and Observer pattern?

There are a few similarities between the Observer and Strategy patterns. The difference between the two patterns is the purpose and use case. The Strategy pattern relies on the strategy to do the work, while the Observer pattern informs the observers of what is going on with the subject.

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 the difference between the template patterns and the strategy 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 design principles is the command pattern using?

In object-oriented programming, the command pattern is a behavioral design pattern in which an object is used to encapsulate all information needed to perform an action or trigger an event at a later time. This information includes the method name, the object that owns the method and values for the method parameters.

What is the difference between factory method and abstract factory?

The main difference between a “factory method” and an “abstract factory” is that the factory method is a single method, and an abstract factory is an object. The factory method is just a method, it can be overridden in a subclass, whereas the abstract factory is an object that has multiple factory methods on it.

Which of the following describes the factory pattern correctly?

In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface. Q 8 – Which of the following is correct about Abstract Factory design pattern. A – This type of design pattern comes under creational pattern.

What is the difference between design design pattern and factory pattern?

Design Patterns: The Strategy and Factory Patterns The Strategy pattern allows us to dynamically swap out algorithms at runtime, and the Factory pattern allows us to create objects as needed. See the synergy between them.

Is it necessary to implement strategy along with factory method?

It is always useful to implement Strategy along with Factory Method. Both Strategy and Factory Method are Gang of Four (GoF) design patterns. Strategy design pattern allows selection of an algorithm’s behaviour during runtime. An example of Strategy is shown in Figure 1.

What is the difference between an abstract factory and strategy pattern?

So, basically with abstract factory you have object creation using different strategies, which makes it very similar to the strategy pattern. However the AbstractFactory is creational, while the Strategy pattern is operational. Implementation wise, they result to be the same.

What is a strategy pattern?

A strategy pattern is an operational pattern. Put another way, a factory pattern is used to create objects of a specific type.