Creational design patterns examples

Creational design patterns in software engineering deal with the process of object creation. They provide mechanisms to create objects in a manner suitable to the situation, abstracting the instantiation process, making the system more independent of its object creation, composition, and representation.

The main goals of creational design patterns include promoting flexibility and reusability, encapsulating object creation logic, and promoting the decoupling of the system from specific classes or implementations.

Here are some commonly used creational design patterns:

1. Singleton Pattern: Ensures a class has only one instance and provides a global point of access to it. It is often used to provide a single point of control for resources, configuration settings, or to represent unique entities in the system.

2. Factory Method Pattern: Defines an interface for creating an object, but leaves the choice of its type to the subclasses, creating instances of one or more derived classes. It provides an interface for creating objects in a super class but allows subclasses to alter the type of objects that will be created.

3. Abstract Factory Pattern: Provides an interface for creating families of related or dependent objects without specifying their concrete classes. It is useful when the system needs to be independent of how its objects are created, composed, and represented, and the system is configured with multiple families of objects.

4. Builder Pattern: Separates the construction of a complex object from its representation, so the same construction process can create different representations. It is useful when an object needs to be constructed with many possible configurations or when the construction steps must be carried out in a specific order.

5. Prototype Pattern: Creates new objects by copying an existing object, known as the prototype. This pattern is useful when the cost of creating an object is more expensive than copying an existing one, and the object creation process involves complex steps.

6. Object Pool Pattern: Maintains a pool of objects, allowing clients to reuse them rather than creating new objects. This can improve performance and resource utilization by minimizing the overhead of creating and destroying objects.

Creational design patterns provide solutions to object creation challenges, allowing developers to create objects in a flexible and efficient way. The choice of which pattern to use depends on the specific requirements of the system and the goals of the design.