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why do we need a Abstract Factory design pattern to create objects? Why can’t we just use the new operator? answer is, to avoid tight coupleing of the objects. But I didn't understand how ? can anyone explain with code (will be very useful).
what makes abstract factory design pattern useful and when.
Thanks in advance. Harsha T
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Abstract factory pattern implementation provides us with a framework that allows us to create objects that follow a general pattern. So at runtime, the abstract factory is coupled with any desired concrete factory which can create objects of the desired type.
In Abstract Factory pattern an interface is responsible for creating a factory of related objects without explicitly specifying their classes.
Factory Method is to creating objects as Template Method is to implementing an algorithm. A superclass specifies all standard and generic behavior (using pure virtual "placeholders" for creation steps), and then delegates the creation details to subclasses that are supplied by the client.
Abstract-Factory Pattern { consequence: The Abstract Factory pattern has the following beneets and liabilities: 1. It isolates concrete classes. 2. It makes exchanging product families easy.
If you use the new operator, you have to specify which exact type you want.
Sometimes you want to be more generic, for example because you want to be able to change that instantiated type in all the codebase quickly.
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An abstract factory design pattern is designed to create an object with a specific setup at initialization time. For example if you have a lot of similarly connected classes, rather than repeating the same 4+ lines [and using copying and pasting], the abstract factory would allow for you to keep the 4+ lines in a single location and reduce the amount of changes needed.
Reference For Abstract Factory
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