Factory Design Pattern
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Design patterns are general reusable solutions to common problems in software design. They are not specific designs that can be transformed directly into code, but descriptions that can be applied to many situations. In 1994, the "Gang of Four" authors published the influential book Design Patterns, which introduced design patterns to software development. The book categorized patterns into creational, structural, and behavioral groups. Factory pattern is a creational pattern that provides a way to create objects without exposing object creation logic to the client. It allows for more flexibility in deciding which objects need to be created.
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- 2. In software engineering, a design pattern is a general repeatable solution to a commonly occurring problem in software design. A design pattern isn't a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations.
- 3. In 1994, four authors Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides published a book titled Design Patterns - Elements of Reusable Object-Oriented Software which initiated the concept of Design Pattern in Software development. These authors are collectively known as Gang of Four (GOF).
- 4. 1 Creational Patterns These design patterns provide a way to create objects while hiding the creation logic, rather than instantiating objects directly using new opreator. This gives program more flexibility in deciding which objects need to be created for a given use case. 2 Structural Patterns These design patterns concern class and object composition. Concept of inheritance is used to compose interfaces and define ways to compose objects to obtain new functionalities. 3 Behavioral Patterns These design patterns are specifically concerned with communication between objects.
- 9. Factory pattern is one of most used design pattern in Java. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object. Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses. In Factory pattern, we create object without exposing the creation logic to the client and refer to newly created object using a common interface.
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