82 of 234 Test passing

src/main/java/rocks/zipcode/io/quiz4/generics/Group.java

 package rocks.zipcode.io.quiz4.generics;
 
+import java.util.ArrayList;
 import java.util.Iterator;
 
 /**
  * @author leon on 18/12/2018.
  */
-public class Group<_> {
+public class Group<_> implements GroupInterface<_>{
+
+    ArrayList<_> group = new ArrayList<>();
+
     public Group() {
-        throw new UnsupportedOperationException("Method not yet implemented");
+
     }
 
     public Integer count() {
-        return null;
+        return group.size();
     }
 
     public void insert(_ value) {
+        group.add(value);
     }
 
     public Boolean has(_ value) {
-        return null;
+        return group.contains(value);
     }
 
     public _ fetch(int indexOfValue) {
-        return null;
+        return group.get(indexOfValue);
     }
 
     public void delete(_ value) {
+        group.remove(value);
     }
 
     public void clear() {
+        group.clear();
     }
 
     public Iterator<_> iterator() {
-        return null;
+        return group.iterator();
+    }
+
+    public String toString(){
+        String output = "[";
+        for(_ i : group){
+            output = output + i + ", ";
+        }
+        output = output.substring(0, output.length()- 2) + "]";
+
+        return output;
     }
 }