Programmer Think

background When the internal data of a class is too complex (it is usually a class that is responsible for holding data, such as Config, VO, PO, Entity...). To create it, you may need to understand the internal structure of this class and how these things are organized and assembled. At this time, the learning cost will be increased and it ...

Factory mode 1. General factory mode Factory Pattern is one of the most commonly used design patterns in Java. This type of design pattern belongs to creation pattern, which provides the best way to create objects. In factory mode, when creating objects, we do not expose the creation logic to the client, and point to the newly created object ...

This article is based on the ideas required by the project to learn from the improved ideas of other bloggers. The ideas will be the same, but this article does belong to my original creation, and the reference link will be displayed at the end of the article (ah, good official...) Let's talk about the functional requirements of the project, ...

Related links: [design mode] column: [design mode] column Relevant examples can be downloaded: Examples of common Java design patterns Command mode Command Pattern is a data-driven design pattern, which belongs to behavioral pattern. The request is wrapped in the object in the form of command and passed to the calling object. The calling ...

objective Simple call and less repetitive code Independent of third-party libraries (only including Retrofit+Okhttp + collaboration) You can start immediately even if you don't understand the collaborative process at all (template code) What does it mean to write Kotlin code in Kotlin's way? Compare the following two codes: mViewModel.wx ...

1. Basic concepts 1. Definition Enables multiple objects to process requests, thereby avoiding coupling between the sender and receiver of the request. Connect these objects into a chain and pass requests along that chain until one object processes it. 4. Examples of similar backgrounds Request process, need main procedure approval wi ...

Bridge mode In the design of software components, if the responsibility division is not clear, the result of inheritance tends to be a rapid expansion of subclasses with duplicate code as demand changes. motivation Because of some fixed inherent implementation logic, they have two or more changing dimensions, and even more. How do you c ...

Design pattern 1, Overview 1. Definition: a set of widely known, widely used, classified and catalogued reliable template code design experience summary. 2. Features: high cohesion and low coupling (also the ultimate goal) 3. Core idea: isolate changes and encapsulate changes 4. Significance: using design patterns can enhance the reusa ...

Strategy mode Definition: define a series of algorithms, encapsulate them one by one, and make them replaceable. This pattern allows the algorithm to vary independently of the customers using it. Advantages: (1) policy pattern provides a way to manage related algorithm families. The hierarchical structure of policy class defines an algorithm ...

Responsibility chain model 1, Definition Responsibility chain pattern: multiple objects have the opportunity to process the request, so as to avoid the coupling relationship between the sender and receiver of the request. Connect these objects into a chain and pass the request along the chain until an object has finished processing i ...