Java适配器模式
2021-06-20 08:05
标签：dia pattern pre imp play pack 结构图 new auth 默认的MediaPlayer接口只能播放mp3格式的音乐，然而我们现在想播放vlc和mp4格式的音乐， 怎么做呢？ 这里我们引入AdvancedMediaPlayer接口，AdvancedMediaPlayer接口可以播放vlc和mp4格式的音乐。 怎么将AdvancedMediaPlayer接口“适配”到MediaPlayer接口中呢？ 这里引入MediaAdapter类，这个类用来适配vlc和mp4格式的音乐 最后用AudioPlayer类实现MediaPlayer接口,适配的工作交给MediaAdapter类 类结构图如下： VlcPlayer.java Mp4Player.java MediaPlayer.java MediaAdapter.java AudioPlayer.java AdvancedMediaPlayer.java AdapterPatternDemo.java 运行结果 Java适配器模式 标签：dia pattern pre imp play pack 结构图 new auth 原文地址：https://www.cnblogs.com/Java-Starter/p/9688911.html
package com.advance.adapter;
/**
* @Auther: 谷天乐
* @Date: 2018/9/20 22:58
* @Description:
*/
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
}
}
package com.advance.adapter;
/**
* @Auther: 谷天乐
* @Date: 2018/9/20 22:58
* @Description:
*/
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);
}
}
package com.advance.adapter;
/**
* @Auther: 谷天乐
* @Date: 2018/9/20 22:57
* @Description:
*/
public interface MediaPlayer {
public void play(String audioType, String fileName);
}
package com.advance.adapter;
/**
* @Auther: 谷天乐
* @Date: 2018/9/20 22:58
* @Description:
*/
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);
}
}
}
package com.advance.adapter;
/**
* @Auther: 谷天乐
* @Date: 2018/9/20 22:59
* @Description:
*/
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");
}
}
}
package com.advance.adapter;
/**
* @Auther: 谷天乐
* @Date: 2018/9/20 22:57
* @Description:
*/
public interface AdvancedMediaPlayer {
public void playVlc(String fileName);
public void playMp4(String fileName);
}
package com.advance.adapter;
/**
* @Auther: 谷天乐
* @Date: 2018/9/20 22:59
* @Description:
*/
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");
audioPlayer.play("avi", "mind me.avi");
}
}
Playing mp3 file. Name: beyond the horizon.mp3
Playing mp4 file. Name: alone.mp4
Playing vlc file. Name: far far away.vlc
Invalid media. avi format not supported