编辑“︁Java适配器模式”︁（章节）

== 代码示例 ==
下面是一个简单的Java适配器模式实现示例：

<syntaxhighlight lang="java">
// 目标接口
interface MediaPlayer {
    void play(String audioType, String fileName);
}

// 被适配的类
class AdvancedMediaPlayer {
    public void playVlc(String fileName) {
        System.out.println("Playing vlc file: " + fileName);
    }
    
    public void playMp4(String fileName) {
        System.out.println("Playing mp4 file: " + fileName);
    }
}

// 适配器类
class MediaAdapter implements MediaPlayer {
    private AdvancedMediaPlayer advancedMusicPlayer;

    public MediaAdapter(String audioType) {
        if(audioType.equalsIgnoreCase("vlc")) {
            advancedMusicPlayer = new AdvancedMediaPlayer();
        } else if(audioType.equalsIgnoreCase("mp4")) {
            advancedMusicPlayer = new AdvancedMediaPlayer();
        }
    }

    @Override
    public void play(String audioType, String fileName) {
        if(audioType.equalsIgnoreCase("vlc")) {
            advancedMusicPlayer.playVlc(fileName);
        } else if(audioType.equalsIgnoreCase("mp4")) {
            advancedMusicPlayer.playMp4(fileName);
        }
    }
}

// 客户端代码
public class AudioPlayer implements MediaPlayer {
    private MediaAdapter mediaAdapter;

    @Override
    public void play(String audioType, String fileName) {
        // 内置支持mp3格式
        if(audioType.equalsIgnoreCase("mp3")) {
            System.out.println("Playing mp3 file: " + fileName);
        }
        // 使用适配器支持其他格式
        else if(audioType.equalsIgnoreCase("vlc") 
                || audioType.equalsIgnoreCase("mp4")) {
            mediaAdapter = new MediaAdapter(audioType);
            mediaAdapter.play(audioType, fileName);
        }
        else {
            System.out.println("Invalid media type: " + audioType);
        }
    }
}

// 测试类
public class AdapterPatternDemo {
    public static void main(String[] args) {
        AudioPlayer audioPlayer = new AudioPlayer();

        audioPlayer.play("mp3", "song.mp3");
        audioPlayer.play("mp4", "movie.mp4");
        audioPlayer.play("vlc", "video.vlc");
        audioPlayer.play("avi", "movie.avi");
    }
}
</syntaxhighlight>

'''输出结果：'''
<pre>
Playing mp3 file: song.mp3
Playing mp4 file: movie.mp4
Playing vlc file: video.vlc
Invalid media type: avi
</pre>

'''代码解释：'''
1. '''MediaPlayer'''是目标接口，定义了客户端期望的方法play()
2. '''AdvancedMediaPlayer'''是被适配的类，它有特殊的方法playVlc()和playMp4()
3. '''MediaAdapter'''是适配器类，它实现了MediaPlayer接口，并在内部使用AdvancedMediaPlayer
4. '''AudioPlayer'''是客户端类，它通过适配器间接使用AdvancedMediaPlayer的功能