用JAVA写一个适配器模式的例子
时间: 2023-04-08 16:05:26 浏览: 98
好的,我可以回答这个问题。适配器模式是一种结构型设计模式,它允许将不兼容的对象包装在适配器中,以便它们可以与其他对象进行交互。以下是一个使用JAVA编写的适配器模式的例子:
首先,我们有一个接口,称为MediaPlayer:
public interface MediaPlayer {
public void play(String audioType, String fileName);
}
然后,我们有两个类,一个是AdvancedMediaPlayer,它可以播放不同类型的音频文件:
public interface AdvancedMediaPlayer {
public void playVlc(String fileName);
public void playMp4(String fileName);
}
public class VlcPlayer implements AdvancedMediaPlayer{
@Override
public void playVlc(String fileName) {
System.out.println("Playing vlc file. Name: "+ fileName);
}
@Override
public void playMp4(String fileName) {
//什么也不做
}
}
public class Mp4Player implements AdvancedMediaPlayer{
@Override
public void playVlc(String fileName) {
//什么也不做
}
@Override
public void playMp4(String fileName) {
System.out.println("Playing mp4 file. Name: "+ fileName);
}
}
现在,我们需要一个适配器,它可以将AdvancedMediaPlayer适配到MediaPlayer接口:
public class MediaAdapter implements MediaPlayer {
AdvancedMediaPlayer advancedMusicPlayer;
public MediaAdapter(String audioType){
if(audioType.equalsIgnoreCase("vlc") ){
advancedMusicPlayer = new VlcPlayer();
}else if (audioType.equalsIgnoreCase("mp4")){
advancedMusicPlayer = new Mp4Player();
}
}
@Override
public void play(String audioType, String fileName) {
if(audioType.equalsIgnoreCase("vlc")){
advancedMusicPlayer.playVlc(fileName);
}
else if(audioType.equalsIgnoreCase("mp4")){
advancedMusicPlayer.playMp4(fileName);
}
}
}
最后,我们可以使用适配器来播放不同类型的音频文件:
public class AudioPlayer implements MediaPlayer {
MediaAdapter mediaAdapter;
@Override
public void play(String audioType, String fileName) {
//播放 mp3 音乐文件的内置支持
if(audioType.equalsIgnoreCase("mp3")){
System.out.println("Playing mp3 file. Name: " + fileName);
}
//mediaAdapter 提供了播放其他文件格式的支持
else if(audioType.equalsIgnoreCase("vlc")
|| audioType.equalsIgnoreCase("mp4")){
mediaAdapter = new MediaAdapter(audioType);
mediaAdapter.play(audioType, fileName);
}
else{
System.out.println("Invalid media. " + audioType + " format not supported");
}
}
}
这就是一个适配器模式的例子。