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cs5/5_6/Program.cs

@@ -0,0 +1,61 @@
+namespace _5_6
+{
+    public interface ICDPlayer
+    {
+        void Play();
+        void Stop();
+        void PreviousTrack();
+        void NextTrack();
+        int CurrentTrack
+        {
+            get;
+        }
+    }
+    public class CDPlayer : ICDPlayer
+    {
+        private int currentTrack = 0;
+        public void Play()
+        {
+            Console.WriteLine("启动CD。。。");
+        }
+        public void Stop()
+        {
+            Console.WriteLine("停止播放CD。。。");
+        }
+        public void PreviousTrack()
+        {
+            if (currentTrack > 0)
+            {
+                currentTrack--;
+            }
+            Console.WriteLine("上一音轨：");
+        }
+        public void NextTrack()
+        {
+            Console.WriteLine("下一音轨：");
+            currentTrack++;
+        }
+        public int CurrentTrack
+        {
+            get
+            {
+                return currentTrack;
+            }
+        }
+    }
+    public class Program
+    {
+        static void Main(string[] args)
+        {
+            CDPlayer mycd = new CDPlayer();
+            mycd.Play();
+            Console.WriteLine("当前音轨：" + mycd.CurrentTrack);
+            mycd.NextTrack();
+            Console.WriteLine("当前音轨：" + mycd.CurrentTrack);
+            mycd.PreviousTrack();
+            Console.WriteLine("当前音轨：" + mycd.CurrentTrack);
+            mycd.Stop();
+
+        }
+    }
+}