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1. Basic introduction definition Convert the interface of a class into another interface desired by the customer, so that those classes that cannot work together due to incompatible interfaces can work together. Main solution The main solution is that in the software system, some "existing objects" are often put into the new enviro ...

In the first two sections, we introduced the principles of object-oriented design in detail Opening and closing principle and Richter substitution principle , in this section, we will introduce the dependency inversion principle. 1, Definition of dependency inversion principle Dependency Inversion Principle (DIP) is an article published by Ro ...

1. What is the agent model    proxy mode refers to providing a proxy for other objects to control access to this object. In some cases, one object is not suitable or cannot directly reference another object, and the proxy object can act as an intermediary between the client class and the target object.      & ...

1. Template mode The simple understanding of template design pattern is templating, standardization, and also a form of calculation and solution coupling. For example, two classes implement an interface, such as student class and teacher class, which inherit the classes of Tsinghua University. How can they distinguish between teachers and stud ...

Chain of responsibility Recently, I am developing a more complex system. At present, the workflow module is written in the system (workflow is designed by architects in the company). A workflow checks the attributes and parameters of an object, while different workflows may redundancy some of the check codes. The verification of individual ...

2.2.4 FrameLayout Introduction to this section FrameLayout can be said to be the simplest of the six layouts. This layout directly opens up a blank area on the screen. When we add controls to it, they will be placed in the upper left corner of this area by default. However, this layout mode does not have any positioning mode, so its applicati ...

[import] The word "adaptation" should be familiar. It often appears in electricity. The family voltage is 220V, but our electrical appliances, such as mobile phones, have a low charging rated voltage, and the charging voltage of computers is also different. However, we need to use the same power supply, and the adapter can turn the p ...

It's still the beginning. The strategy mode seems to be very popular recently. Please look downWhat is the strategic model?In fact, we have explained the structural mode before, and the rest are all behavioral modes. The distinction between the three modes is as follows:Creative mode: how to create an objectStructural pattern: how is the struct ...

Classification of design patterns: Design patterns are generally divided into three categories: Creative pattern: factory method pattern, abstract factory pattern, singleton pattern, builder pattern, prototype pattern. Structural mode: adapter mode, decorator mode, agent mode, appearance mode, bridge mode, combination mode and sharing mode. ...

preface: Simple factory pattern and strategy pattern are two design patterns that most programmers come into contact with the earliest when learning design patterns or use more in work practice. One is creative and the other is behavioral. However, there are some similarities between the two different types of models. At the same time, it can ...