Adapter_Struct_Design

Example Adapter Design Pattern

This project demonstrates the use of the Adapter Design Pattern to convert between incompatible interfaces. It includes the implementation of an AudioPlayer class that plays audio files, and an adapter (MediaAdapter) that allows it to play video files using an existing VideoPlayer interface.

The Adapter Pattern allows the AudioPlayer to work with the MediaPlayer interface, enabling different types of media to be played in a unified way.

Purpose of the Adapter Pattern

The Adapter Design Pattern is used to allow classes with incompatible interfaces to work together. In this case, the AudioPlayer class is designed to play audio files, while the VideoPlayer interface handles video files. The MediaAdapter class is used to convert between these two incompatible interfaces, enabling the AudioPlayer to handle both audio and video playback through a unified interface.

How the Adapter Works

• MediaPlayer Interface: Defines the general contract for playing media files (audio and video).
• AudioPlayer Class: Implements the MediaPlayer interface and is capable of playing audio files.
• VideoPlayer Interface: Defines the contract for playing video files.
• MediaAdapter Class: Implements the MediaPlayer interface and is used to convert calls to the VideoPlayer interface, making it compatible with the AudioPlayer.

When the AudioPlayer is asked to play a video, the MediaAdapter redirects the call to the VideoPlayer to play the video.

How to Run the Project

1. Clone the repository

2. Navigate to the project directory

3. Compile the Java files: javac -d out/production/classes src/main/java/org/example/*.java

4. Run the application: java -cp out/production/classes org.example.Main

This will run the Main class, which demonstrates the use of the Adapter Design Pattern.

Key Classes in the Adapter Pattern

• MediaPlayer Interface: Defines the play() method that all media players (audio/video) must implement.

• AudioPlayer Class: Implements the MediaPlayer interface and provides functionality to play audio files.

• VideoPlayer Interface: Defines the playVideo() method for video playback.

• MediaAdapter Class: Implements the MediaPlayer interface and delegates the play() method to the VideoPlayer class when playing a video.

• Main Class: The entry point of the program, where the AudioPlayer and MediaAdapter are instantiated and used to play both audio and video.

Expected Output

When running the Main class, the following output will be displayed:

Conclusion

The Adapter Design Pattern allows for the flexibility of using incompatible interfaces without changing the existing code. By using an adapter, we can extend the functionality of a class to support new types of media (audio and video) while maintaining a consistent interface. This pattern demonstrates how software components can be integrated more effectively without modifying their original design.