Java-88-设计模式-4-适配器模式

packagecom.xing.design.adapter;
/***  媒体播放器接口* @author xing* @createTime*/publicinterfaceMediaPlayer {
/***  播放* @param audioType 类型* @param fileName 文件名*/publicvoidplay(StringaudioType, StringfileName);
}
MP3：packagecom.xing.design.adapter;
publicclassMp3PlayerimplementsMediaPlayer{
@Overridepublicvoidplay(StringaudioType, StringfileName) {
//播放 mp3 音乐文件的内置支持if(audioType.equalsIgnoreCase("mp3")){
System.out.println("播放 mp3 file. Name: "+fileName);         
    }else{
System.out.println("无效的媒体类型. "+audioType+"不支持播放");
    }
  }
}

packagecom.xing.design.adapter;
/***  mp4只能播放MP4* @author xing* @createTime*/publicclassMp4PlayerimplementsMediaPlayer{
@Overridepublicvoidplay(StringaudioType, StringfileName) {
if("mp4".equals(audioType)) {
System.out.println("播放 mp4 file. Name: "+fileName);      
    }else {
System.out.println("无效的媒体类型. MP4播放器不支持"+audioType+"类型播放");
    }
  }
}

packagecom.xing.design.adapter;
/***  适配器* @author xing* @createTime*/publicclassMediaAdapterimplementsMediaPlayer{
/*** MP4播放器*/Mp4Playermp4Player;
publicMediaAdapter(StringaudioType){
if(audioType.equalsIgnoreCase("mp4")){
mp4Player=newMp4Player();
    }else {
System.out.println("只可适配MP4格式，如需扩展，在此处引入。");
    }
  }
@Overridepublicvoidplay(StringaudioType, StringfileName) {
mp4Player.play(audioType, fileName);
  }
}

packagecom.xing.design.adapter;
publicclassMp3PlayerimplementsMediaPlayer{
MediaAdaptermediaAdapter;
@Overridepublicvoidplay(StringaudioType, StringfileName) {
//播放 mp3 音乐文件的内置支持if(audioType.equalsIgnoreCase("mp3")){
System.out.println("播放 mp3 file. Name: "+fileName);         
    }elseif(audioType.equalsIgnoreCase("mp4")){
//mediaAdapter 提供了播放其他文件格式的支持mediaAdapter=newMediaAdapter(audioType);
mediaAdapter.play(audioType, fileName);
    }else{
System.out.println("无效的媒体类型. "+audioType+"不支持播放");
    }
  }
}

packagecom.xing.design.adapter;
publicclassAdapterPatternDemo {
publicstaticvoidmain(String[] args) {
// MP3播放Mp4Playermp4=newMp4Player();
System.out.println("用mp4播放器播放:");
mp4.play("mp3","2.MP3");
mp4.play("mp4","2.MP4");
Mp3Playerplayer=newMp3Player();
System.out.println("通过适配器用mp3播放器播放不同类型:");
player.play("mp3", "3.mp3");
player.play("mp4", "4.mp4");
player.play("vlc", "v.vlc");
  }
}