head hurts

PlaylistChallenge.iml

@@ -13,5 +13,7 @@
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.12" level="project" />
     <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+    <orderEntry type="library" name="Maven: junit:junit:4.12" level="project" />
+    <orderEntry type="library" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
   </component>
 </module>

pom.xml

@@ -16,5 +16,10 @@
             <version>4.12</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>RELEASE</version>
+        </dependency>
     </dependencies>
 </project>

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

@@ -4,11 +4,33 @@ public class Music {
 
     private String[] playList;
 
-    public Music(String[] playList){
-        this.playList = playList;
+   public Music(String[] playList){
+       this.playList = playList;
     }
 
     public Integer selection(Integer startIndex, String selection){
-        return null;
+        int lengthOfList = playList.length;
+        int goForward = 0;
+        int goBack = 0;
+        int Index = 0;
+
+        //go through playList, song=index
+        for(int i = 0; i < playList.length; i++){
+            if (selection.equals(playList[i])){
+                Index = i;
+
+         //
+                if(Index > startIndex) {
+                    goForward = Index - startIndex;
+
+                    if (Index < lengthOfList - 1) {
+                        goBack = lengthOfList - 1 - Index;
+                    }
+                }
+            }
+        }
+            if (goForward < goBack){
+            return goBack;
+            }else return goForward;
     }
 }