Understand that the Adapter pattern Adapter pattern is a structural design pattern, which is used to convert incompatible interfaces to the interfaces expected by client code. By using the Adapter pattern, developers can make incompatible classes work together, thus improving code reusability and flexibility. The role of Adapter pattern The Adapter pattern has an important role and value in software development, which is mainly reflected in the following aspects: 1 In software development, it is common to encounter situations where different classes have incompatible interfaces. The Adapter pattern can solve the interface incompatibility problem by converting these incompatible interfaces so that they can work together. For example, suppose there is an audio player that can only accept MP3 format audio, but we hope it can play audio files in other formats, such as WAV, MP4, etc. At this time, you can use the Adapter pattern to write an adapter class to convert audio files of other formats to MP3 format, so that the audio player can play audio files of different formats. 2. Improving reusability and extensibility The Adapter pattern enables incompatible classes to work together, thereby improving code reusability. By using the Adapter pattern, we can integrate the existing class library, interface or component with the new system without modifying the existing code, thus reducing the risk of code modification. In addition, the Adapter pattern allows us to add new adapter classes as needed to support more interfaces or class libraries. In this way, the scalability of the system is ensured and it can be easily integrated with other systems. 3. Improve code readability Adapter pattern can make the code clearer and easier to read. By using the Adapter pattern, we can use proper naming and encapsulation to convert various incompatible classes and implement corresponding interfaces in the adapter class. In this way, the client code can more clearly understand and use these classes, improving the readability of the code. Summary: The Adapter pattern is a design pattern that can solve the interface incompatibility problem, improve reusability and extensibility, and improve code readability. Its role and usage in software development are very important, as it can help developers better integrate different classes, interfaces, and components. Understanding and applying the Adapter pattern can make our code more flexible and extensible, thus improving development efficiency and system quality.