Design pattern factory method
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The document discusses the factory design pattern in Java. The factory pattern is used when the creator hides class creation and instantiation from the client. The client only cares about getting an object that can do the job, without knowing the specific class. The factory provides an interface for clients to obtain the desired object, acting as a producer that handles object instantiation. The factory pattern implements an interface with different product classes that the factory can produce.
Design pattern factory method
- 3. The client does not care about the classes implementation, he wants to get the class that will do his job only. Client wants to choose one of the several available objects I need to implement something like java class factory that I can produce the clients needs !!
- 6. In real world , Factory is : a manufactory that produce the products to clients , look like Cars factory , Computer factory … and finally Java Object factory
- 7. • Factory pattern or Factory method pattern is one of the most important and common pattern in Java under Creational Pattern group . • Use factory pattern when the creator hide the class creation and instantiation of the product from the client. • Client does not care about concrete classes implementation . • Client can chose one of server available classes ( like product catalog ) and use it directly without instantiate • Producer provide an interface to client to use the desired object in his job. .
- 8. • Create an Interface for product s use same implementation (TOYOTA) • Impalement this interface with all products in same category that the factory will produce (Corolla , Camry , Yaris) • You can create an abstract class to inherit all shared implementation like “ buy new car procedures .” • Create factory method would be responsible for instantiating needed object s • When the client uses the object , the factory responsible for instantiating the object