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It is also called static factory mode. In fact, it does not belong to 23 design modes. His realization is mainly Define a class that dynamically determines which instance of a product class (which inherits from a parent class or interface) should be created according to the passed in parameters. In fact, the instantiation of a specific clas ...

Recommended reading Design pattern C + + factory method pattern Brand awareness is gradually increasing, not only producing one product. If we continue to use one factory for one product, then if there are three brands Huawei, Xiaomi and apple. They each want three products: mobile phones, headphones and laptops. At this time, we need to create ...

If the cost of creating objects is relatively large, and there is little difference between different objects of the same class (most fields are the same), in this case, we can create new objects by copying (or copying) existing objects (prototypes), so as to save creation time. This method of creating objects based on prototypes is called Prot ...

Tip: after the article is written, the directory can be generated automatically. Please refer to the help document on the right for how to generate it Android layout In the Android APP project, there are several layout methods: linear layout, relative layout, flat layout, absolute layout, etc. The most used are linear layout and relativ ...

During the development of some application projects, voice detection functions are sometimes needed, that is, the functions of recognizing knocking, door ringing, car horn sound and so on. For small and medium-sized developers, developing and building this ability alone is time-consuming and labor-consuming. However, the voice recognition servi ...

Design pattern - singleton pattern concept Basic introduction The so-called singleton design pattern is to take certain methods to ensure that there is only one object instance for a class in the whole software system, and the class only provides a method to obtain its object instance (static method); Single case mode of eight writing me ...

Abstract: Design Pattern is a set of code design experience that is repeatedly used, known by most people, classified and catalogued. The purpose of using Design Pattern is to reuse code, make code easier to be understood by others and ensure code reliability. This article is shared from Huawei cloud community< Come on, here are the Go la ...

adapter design pattern Model introduction Design mode: structural design mode. Adapter pattern is a structural design pattern with high frequency of use. If there are incompatible interfaces in the system, we can introduce an adapter class as an intermediate class to make two classes that cannot work together because of incompatible int ...

In Alibaba java development manual, it is pointed out that thread resources must be provided through thread pool, and it is not allowed to create threads displayed in the application. On the one hand, the creation of threads is more standardized, which can reasonably control the number of threads; On the other hand, the detail management of thr ...

There are many logging frameworks in Java. In project development, we often use them to print log information. Among them, log4j, logback, JUL(java.util.logging) provided by JDK and JCL(Jakarta Commons Logging) of Apache are commonly used. Most logging frameworks provide similar functions, such as printing logs at different levels (debug, info ...