done with lab

src/main/java/io/zipcoder/Music.java

@@ -5,10 +5,83 @@ public class Music {
     private String[] playList;
 
     public Music(String[] playList){
+
         this.playList = playList;
     }
 
-    public Integer selection(Integer startIndex, String selection){
-        return null;
+    public int MoveForward(int currentPosition)
+    {
+        int nextPosition = 0;
+        if (currentPosition != playList.length-1)
+        {
+            nextPosition = currentPosition+1;
+        }
+        else nextPosition = 0;
+
+        return nextPosition;
+
+    }
+
+    public int MoveBackward(int currentPosition)
+    {
+        int nextPosition = 0;
+        if (currentPosition != 0)
+        {
+            nextPosition = currentPosition-1;
+        }
+        else nextPosition = playList.length-1;
+
+        return nextPosition;
+    }
+
+    public Integer selection(Integer startIndex, String selection)
+    {
+        Integer noClickForward = 0;
+        Integer noClickBackward = 0;
+        //forward
+        int currentIndex = startIndex;
+        int nextIndex = MoveForward(currentIndex);
+        for (int i=0; i<playList.length ; i++)
+        {
+            if (playList[nextIndex].equalsIgnoreCase(selection))
+            {
+                i=playList.length;
+
+            }
+            else
+            {
+                currentIndex++;
+                nextIndex = MoveForward(currentIndex);
+
+            }
+            noClickForward++;
+        }
+
+        currentIndex = startIndex;
+        nextIndex = MoveBackward(currentIndex);
+        for (int i=0; i<playList.length ; i++)
+        {
+            if (playList[nextIndex].equalsIgnoreCase(selection))
+            {
+                i=playList.length;
+
+            }
+            else
+            {
+                currentIndex++;
+                nextIndex = MoveBackward(currentIndex);
+
+            }
+            noClickBackward++;
+        }
+
+        if (noClickForward>noClickBackward)
+        {
+            return noClickBackward;
+        }
+        else {
+            return noClickForward;
+        }
+
     }
 }