Introduction to Adapter pattern 
Adapter is a common design pattern, which is used to convert the interface of a class to another interface expected by the client. In other words, the Adapter pattern enables incompatible classes to work together because their interfaces become compatible after being converted by the adapter. The Adapter pattern can provide interoperability between different interfaces. It encapsulates specific implementation details, making client calls simple and convenient.
Common application scenarios of Adapter pattern 1 Object Adapter pattern Object Adapter pattern is a common implementation of Adapter pattern. In an object adapter, the adapter converts its expected interface into a target interface for use by the client by containing an instance of the adapted object. For example, when a system needs to use a third-party library or API, and the interface of this library is incompatible with the system interface, we can use the Adapter pattern to convert the interface of the third-party library into the desired interface of the system, so as to achieve interoperability between the two.
2. Class Adapter pattern Class Adapter pattern is another implementation of Adapter pattern. In a class adapter, the adapter converts its expected interface into a target interface by inheriting the adapted class. By inheriting the adapted class, the adapter can override the methods of the parent class to achieve adaptation functionality. The Adapter pattern is common in some scenarios where there is only a single adaptation target.
Advantages of Adapter pattern Adapter pattern has many advantages, making it one of the design patterns widely used in software development.
First, the Adapter pattern can improve code reusability. By using the Adapter pattern, we can reuse existing classes and adapt them to meet different interface requirements. In this way, we don't need to modify the source code of existing classes, just wrap and transform them through adapters.
Secondly, the Adapter pattern can provide good scalability. When it is necessary to add new adapters to support different interfaces, we can easily extend the adapter class without modifying existing code. This flexibility makes the system easier to expand and maintain.
Finally, the Adapter pattern can improve the flexibility of the system. Through the Adapter pattern, we can abstract the interface, which makes the system more flexible. When external interfaces change, we only need to modify the implementation of the adapter without modifying existing code, thereby improving the maintainability and scalability of the system.
Summarize that the Adapter pattern is a design pattern that can improve Code reuse, scalability and flexibility, and it is widely used in software development. Through the Adapter pattern, we can convert incompatible interfaces into compatible interfaces, so that various components in the system can cooperate with each other. Understanding the principle and application scenarios of the Adapter pattern is of great significance for improving the efficiency and quality of software development.
