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In the previous section, we talked about LinearLayout, which is also the first layout you learned. It supports multiple views in a linear manner (horizontal or vertical) combination. The most practical one is the weight attribute. Using weight well can make your linear layout more flexible and beautiful. However, in the example in the previous ...

Prototype mode (Prototype Pattern) is used to create duplicate objects while ensuring performance. This type of design pattern belongs to the creation pattern, which provides the best way to create objects. This pattern implements a prototype interface, which is used to create clones of the current object. This pattern is used when the cost of ...

summary Decorator Pattern allows adding new functions to an existing object without changing its structure. It is used as a wrapper for an existing class. To extend the functionality of an object, the decorator pattern provides a more flexible alternative than inheritance. Combination is better than inheritance. When to use: You need to ext ...

1, Simple factory mode 1.1 simple factory mode Simple Factory Pattern specifically defines a class to be responsible for creating instances of other classes. The created instances usually have a common parent class. Simple factory mode is a way to instantiate objects. As long as you enter the name of the object to be instantiated, you can cr ...

1, Basic introduction English Name: MediatorConcept: encapsulate a series of object interactions with a mediation object. The mediator makes the objects interact without display, so that their coupling is loose, and the interaction between them can be changed independentlyMode type: structuralDesign principle:Main features: a class is only res ...

Related links: [design mode] column: [design mode] column Relevant examples can be downloaded: Examples of common Java design patterns Adapter mode preface In real life, there are often instances where two objects cannot work together due to incompatible interfaces. At this time, a third party needs to adapt. For example, a Chinese s ...

brief introduction Commons chain is a subproject of apache commons. It is mainly used in the "responsibility chain" scenario. The call process of action in struts is supported by the "chain" framework If your project also has requirements based on this scenario, you can consider using itThe so-called "responsibility ch ...

Factory mode: effect: It realizes the separation of caller and calleeDetailed classification Simple factory modeFactory method modelAbstract factory pattern Meet the seven principles of OOP Opening and closing principleDependency Inversion PrincipleDimitt's law Three modes Simple factory mode: It is used to produce any product in ...

Recently, I participated in several interviews and felt deeply about the application of several common design patterns. In order to strengthen their own understanding, and also hope to give some junior developers some reference learning, I decided to start writing a few blog posts on common PHP design patterns. The working reasons will be updat ...

Abstract factory The object creation mode bypasses new to avoid the tight coupling caused by the object creation (new needs to rely on specific classes), so as to support the stability of object creation. It is the first step after abstracting the interface motivation It mainly solves a series of "interdependent objects". The F ...