适配器模式

2个接口，普通播放器，高级播放器

普通播放器 MediaPlayer

public  interface MediaPlayer {
	void play(String audioType, String fileName);
}

高级播放器 AdvancedMediaPlayer

public interface AdvancedMediaPlayer {
	void playVlc(String fileName);
	void playMp4(String fileName)
}

vlc播放器实现

public class VlcPlayer implements AdvancedMediaPlayer {
	public void playVlc(String fileName){
		System.out.println("vlc play :" + fileName);
	}
	public void playMp4(String fileName){
	
	}
}

mp4播放器实现

public class Mp4Player implements AdvancedMediaPlayer {
	public void playVlc(String fileName){
	
	}
	public void playMp4(String fileName){
		System.out.println("mp4 play:" + fileName);
	}
}

创建适配器，实现MediaPlayer

public MediaAdapter implements MediaPlayer {

	AdvancedMediaPlayer advancedMediaPlayer;
	public MediaAdapter(String audioType){
		switch(audioType){
			case "vlc":
				advancedMediaPlayer =  new VlcPlayer();
				break;
			case "mp4":
				advancedMediaPlayer =  new Mp4Player();
				break;
		}
	}
	
	public void play(String audioType, String fileName){
		switch(audioType){
			case "vlc":
				advancedMediaPlayer.playVlc(fileName);
				break;
			case "mp4":
				advancedMediaPlayer.playMp4(fileName);
				break;
		}
	}
}

引用适配器，进行定义开发

public AudioPlayer implements MediaPlayer {
	MediaAdapter mediaAdapter;
	public void play(String audioType, String fileName){
		switch(audioType){
			case "mp3":
				System.out.println("mp3 play:" + fileName);
				break;
			case "vlc":
				mediaAdapter = new  MediaAdapter("vlc");
				mediaAdapter.play(audioType,fileName);
				break;
			case "mp4":
				mediaAdapter = new  MediaAdapter("mp4");
				mediaAdapter.play(audioType,fileName);
				break;
		}
	}
}

main函数测试

public class AdapterPatternDemo {
   public static void main(String[] args) {
      AudioPlayer audioPlayer = new AudioPlayer();
      audioPlayer.play("mp3", "beyond the horizon.mp3");
      audioPlayer.play("mp4", "alone.mp4");
      audioPlayer.play("vlc", "far far away.vlc");
   }
}