Adapter Pattern Example for Media Player Implementation in Java

adapter_demo/Advanced_Media_Player.java

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+package com.example.adapterpattern;
+
+// Step 1: Target interface
+interface MediaPlayer {
+    void play(String audioType, String fileName);
+}
+
+// Step 2: Adaptee class
+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);
+        }
+    }
+}
+
+// Step 3: Advanced Media Player (Adaptee)
+interface AdvancedMediaPlayer {
+    void playVlc(String fileName);
+    void playMp4(String fileName);
+}
+
+class VlcPlayer implements AdvancedMediaPlayer {
+    public void playVlc(String fileName) {
+        System.out.println("Playing vlc file: " + fileName);
+    }
+
+    public void playMp4(String fileName) {
+        // Do nothing
+    }
+}
+
+class Mp4Player implements AdvancedMediaPlayer {
+    public void playVlc(String fileName) {
+        // Do nothing
+    }
+
+    public void playMp4(String fileName) {
+        System.out.println("Playing mp4 file: " + fileName);
+    }
+}
+
+// Step 4: Concrete class using adapter
+class AudioPlayer implements MediaPlayer {
+    MediaAdapter mediaAdapter;
+
+    @Override
+    public void play(String audioType, String fileName) {
+        if (audioType.equalsIgnoreCase("mp3")) {
+            System.out.println("Playing mp3 file: " + fileName);
+        } else if (audioType.equalsIgnoreCase("vlc") || audioType.equalsIgnoreCase("mp4")) {
+            mediaAdapter = new MediaAdapter(audioType);
+            mediaAdapter.play(audioType, fileName);
+        } else {
+            System.out.println("Invalid media type: " + audioType);