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This article shares with you the content of a sample analysis of the method factory pattern in java. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Main points of factory method model:

-in order to avoid the shortcomings of the simple factory model, OCP is not fully satisfied.

-the biggest difference between the factory method model and the simple factory model is that the simple factory model has only one factory class (for a project or a separate module). The factory method pattern has a set of factories that implement the same interface (used to produce fixed products in the same hierarchy and support the addition of arbitrary products)

2 method factory mode

I still use a code example to explain!

1. First of all, write out the Animal interface and Dog,Cat classes like a simple factory. I won't write the code here. Friends who want to see the code can read an article.

two。 Let's first create the AnimalFactory interface:

Public interface AnimalFactory {

Animal createAniaml ()

}

3. Continue to create DogFactory,CatFactory classes and inherit the AnimalFactory interface

Public class CatFactory implements AnimalFactory {

@ Override

Public Animal createAniaml () {

Return new Cat ()

}

}

Public class DogFactory implements AnimalFactory {

@ Override

Public Animal createAniaml () {

Return new Dog ()

}

}

4. Finally, let's test our code:

Public class Test {

Public static void main (String [] args) {

Animal A1 = new DogFactory () .createAniaml ()

Animal a2 = new CatFactory () .createAniaml ()

A1.speak ()

A2.speak ()

}

}

Running result:

Woof! woof!

Meow, Meow, Meow!

Process finished with exit code 0

Analysis: compared with the simple factory model, the method factory model solves the problem of OCP, but it has a very bad place-that is, the structure is too complex, because we have created two more factory classes, if we want to add some factories in the future, we need to create a lot of classes, so now this model is used less, and most of them are still simple factory patterns.

Thank you for reading! This is the end of this article on "sample Analysis of method Factory patterns in java". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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