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Factory mode effect: It realizes the separation of creator and caller Detailed classification: Simple factory mode It is used to produce any product in the same hierarchical structure (for adding new products, the existing code needs to be overwritten) Factory mode method It is used to produce fixed products with the same level struct ...

1, Smelly and long if... else No more nonsense. First look at the following code publicinterface IPay { void pay(); } @Service publicclass AliaPay implements IPay { @Override public void pay() { System.out.println("===Launch Alipay payment==="); } } @Service publicclass WeixinPay implements IPay { ...

Factory pattern is a design pattern used to create objects. We do not expose the logic of object creation, but encapsulate the logic in a function, so this function can become a factory. Factory patterns can be divided into: 1 Simple factory 2 Factory method 3 Abstract factory Simple factory Simple factory pattern is very easy to understand ...

Abstract: This paper will describe the interface isolation principle and Dependency Inversion Principle in SOLID principle. This article is shared from the Huawei cloud community "practice the design pattern of GoF 23: SOLID principle (Part 2)", author: yuan Runzi. In< Practice 23 design modes of GoF: SOLID principle (I) >In ...

Basic introduction and advanced series of articles on Android development are being released and shared with you. Interested partners can follow bloggers! Explore and learn Android technology together to help you fight on the road of programming! catalogue 1, RadioButton radio box 2, CheckBox check box 3, Spinner drop-down box 4, ListVie ...

20 programming specifications to quickly improve code quality It is mainly divided into three parts: Naming and Comments Naming How long is the most appropriate name? There are two extremes of named length: 1 Full name nomenclature 2 Familiar with word abbreviations and nomenclature Advantages: more accurate and intuitive Disa ...

1, What is an adapter 1) Adapter pattern transforms the interface of a class into another interface expected by the client. The main purpose is compatibility, so that two classes that cannot work together due to interface mismatch can work together. Its alias is wrapper 2) The adapter mode is a structural mode 3) It is mainly divided into th ...

summary Proxy mode: first, there must be an interface. Both proxy class and proxy class implement the same interface. Finally, the proxy is the method of the proxy class. Proxy pattern is a design pattern that is widely used in Java development. Agent design is to provide an agent for an object to control access to the object. Any call to the ...

1, What is a simple factory 1) Simple factory mode belongs to the creation mode, which is a kind of factory mode. The simple factory pattern is that a factory object determines which product class instance to create. Simple factory model is the simplest and most practical model in the factory model family 2) Simple factory pattern: defines a ...

1. Why do you need to use design patterns? Using design patterns to reconstruct the whole code can improve the reusability and scalability of the code and reduce code redundancy. 2. Talk about the six principles of design mode? Open Close Principle: the Open Close Principle is open to extensions and closed to modifications. When the prog ...