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1, What is the builder model Builder Pattern, also known as Builder Pattern, is an object construction pattern. It can abstract the construction process of complex objects (abstract categories), so that different implementation methods of this abstract process can construct objects with different representations (attributes). Builder mode is ...

Welcome to WeChat official account: FSA full stack operation 👋 1, Foreword Design pattern is a guide to solve specific problems in software engineering. We often say that there are 23 design patterns in Java. As a better Java, Kotlin with multi paradigm has many new language features. What improvements can be made when using the design pat ...

23 visitor mode 23.1 concept Encapsulates some operations that act on each element in a data structure. New operations that act on these elements can be defined without changing the data structure. 23.2 structure Abstract visitor role: defines the behavior of accessing each element. Its parameters are the accessible elements. Theoretica ...

My cousin asked me to repair her radio, which confused me Cousin: brother, my computer blue screen crashed 😓 Me: let me show you. One meal operation Me: you have two memory modules here, but one of them is broken. I'll unload it now and use the good one for the time being. Cousin: Wow! Sure enough, that's great 👍 By the way, broth ...

21 intermediary model 21.1 concept Define a mediation role to encapsulate the interaction between a series of objects, so that the coupling between the original objects is loose, and the interaction between them can be changed independently. Multiple classes are interrelated, showing a complex network structure and over coupling. The medi ...

Dynamic agent (JDK agent) Let's start with a few points: What is dynamic agent? Dynamic agents are still agents in essence However, the relationship between the agent and the represented object is dynamically determined. For example, Wang Ergou's colleague Niu Cuihua did not determine her attorney before the court session, but chose a law ...

1, Definition of singleton mode Definition: ensure that there is only one instance of a class and provide the global access point of the instance. The advantage of this is: for some instances, only one global instance is enough. Using the singleton mode can avoid the frequent creation and destruction of a global class, which consumes system r ...

System status bar status bar analysis (Android o) 1 Overview In the system UI, the status bar provides users with some quick information display and function operation. The user can display more information on the screen in a reasonable way through the drop-down bar. On the 848 platform, there are two configurable status bars: StatusBar a ...

Full analysis of 23 design patterns (implemented in JAVA). Introduction: Composite Pattern, also known as partial overall pattern, is used to treat a group of similar objects as a single object. The combination mode combines objects according to the tree structure, which is used to represent the partial and overall levels. This type of de ...

4. Creation mode The main focus of creative mode is "how to create objects?", Its main feature is "separating the creation and use of objects". This can reduce the coupling degree of the system, and users do not need to pay attention to the creation details of objects. The creation mode is divided into: Singleton modeFac ...