 |
 |
 |
 |
 |
|---|
| Design Pattern | Definition | Purpose of Use | How to Use |
|---|---|---|---|
| Factory Method | Provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created. | - Decouple from specific subclasses. - Easily extend by adding new subclasses. | Define an interface or abstract class containing the Factory Method, then implement the Factory Method in the subclasses. |
| Abstract Factory | Provides an interface for creating families of related or dependent objects without specifying their concrete classes. | - Maintain consistency among related objects. | Define an interface or abstract class for the Abstract Factory, then implement this interface in concrete classes. |
| Builder | Allows constructing a complex object step by step. | - Build objects with multiple attributes or options. | Create a Builder class for the object to be constructed, define methods for setting attributes or options, and implement a build method for constructing the object. |
| Prototype | Allows creating new objects by copying an existing object. | - Create multiple copies of an object without recreating it from scratch. | Define a copy method for object copying or implement the Cloneable interface (if available). |
| Singleton | Ensures that a class has only one instance and provides a global point of access to it. | - Ensure only one instance of a class. - Share the instance throughout the application. | Implement the Singleton class by ensuring the constructor is private and providing a static method to access the Singleton instance. |