diff --git a/list/src/main/java/de/vivi/list/ArrayByteList.java b/list/src/main/java/de/vivi/list/ArrayByteList.java
index e0bebcd..21ff0b5 100644
--- a/list/src/main/java/de/vivi/list/ArrayByteList.java
+++ b/list/src/main/java/de/vivi/list/ArrayByteList.java
@@ -30,10 +30,8 @@ public class ArrayByteList implements ByteList {
     @Override
     public void add(int index, byte value) {
         byte[] newArray = new byte[array.length + 1];
-        System.arraycopy(array, 0, newArray, 0, array.length);
-        for (int i = newArray.length - 1; i >= index; i--) {
-            newArray[i] = newArray[i - 1];
-        }
+        System.arraycopy(array, 0, newArray, 0, index);
+        System.arraycopy(array, index, newArray, index + 1, size - index);
         newArray[index] = value;
         array = newArray;
     }
@@ -82,7 +80,7 @@ public class ArrayByteList implements ByteList {
     }
 
     @Override
-    public ArrayByteList copy() {
+    public ByteList copy() {
         ArrayByteList newArrayList = new ArrayByteList();
         newArrayList.array = Arrays.copyOf(array, array.length);
         return newArrayList;
diff --git a/list/src/main/java/de/vivi/list/ArrayByteListIterator.java b/list/src/main/java/de/vivi/list/ArrayByteListIterator.java
index e7d4e70..e2690e5 100644
--- a/list/src/main/java/de/vivi/list/ArrayByteListIterator.java
+++ b/list/src/main/java/de/vivi/list/ArrayByteListIterator.java
@@ -21,14 +21,4 @@ public class ArrayByteListIterator implements Iterator<Byte> {
     public Byte next() {
         return array.get(currentIndex++);
     }
-
-    @Override
-    public void remove() {
-        Iterator.super.remove();
-    }
-
-    @Override
-    public void forEachRemaining(Consumer action) {
-        Iterator.super.forEachRemaining(action);
-    }
 }
diff --git a/list/src/main/java/de/vivi/list/ByteList.java b/list/src/main/java/de/vivi/list/ByteList.java
index 0947f69..72e8850 100644
--- a/list/src/main/java/de/vivi/list/ByteList.java
+++ b/list/src/main/java/de/vivi/list/ByteList.java
@@ -18,7 +18,7 @@ public interface ByteList extends Iterable<Byte> {
 
     String toString();
 
-    ArrayByteList copy();
+    ByteList copy();
 
     void clear();
 }
diff --git a/list/src/main/java/de/vivi/list/LinkedByteList.java b/list/src/main/java/de/vivi/list/LinkedByteList.java
index 0d8bf3a..7a5c73e 100644
--- a/list/src/main/java/de/vivi/list/LinkedByteList.java
+++ b/list/src/main/java/de/vivi/list/LinkedByteList.java
@@ -83,19 +83,6 @@ public class LinkedByteList implements ByteList {
         }
         return current;
     }
-//    NodeLinked node(int index) {
-//        if (index < (size >> 1)) {
-//            NodeLinked x = first;
-//            for (int i = 0; i < index; i++)
-//                x = x.next;
-//            return x;
-//        } else {
-//            NodeLinked x = last;
-//            for (int i = size - 1; i > index; i--)
-//                x = x.prev;
-//            return x;
-//        }
-//    }
 
     @Override
     public byte get(int index) {
@@ -123,8 +110,15 @@ public class LinkedByteList implements ByteList {
     }
 
     @Override
-    public ArrayByteList copy() {
-        return null;
+    public ByteList copy() {
+        LinkedByteList clone = new LinkedByteList();
+        clone.first = clone.last = null;
+        clone.size = 0;
+
+        for (NodeLinked x = first; x != null; x = x.next) {
+            clone.add(x.item);
+        }
+        return clone;
     }
 
     @Override
@@ -139,8 +133,9 @@ public class LinkedByteList implements ByteList {
     }
 
     @Override
-    public Iterator<Byte> iterator() {
-        return null;
+    public LinkedByteListIterator iterator() {
+        LinkedByteListIterator it = new LinkedByteListIterator(this);
+        return it;
     }
 
     @Override
diff --git a/list/src/main/java/de/vivi/list/LinkedByteListIterator.java b/list/src/main/java/de/vivi/list/LinkedByteListIterator.java
index a29cef5..1115998 100644
--- a/list/src/main/java/de/vivi/list/LinkedByteListIterator.java
+++ b/list/src/main/java/de/vivi/list/LinkedByteListIterator.java
@@ -1,6 +1,23 @@
 package de.vivi.list;
 
-public class LinkedByteListIterator {
-    public LinkedByteListIterator(LinkedByteList bytes) {
+import java.util.Iterator;
+import java.util.function.Consumer;
+
+public class LinkedByteListIterator implements Iterator<Byte> {
+    private LinkedByteList linkedList;
+    private int currentIndex;
+
+    public LinkedByteListIterator(LinkedByteList linkedList) {
+        this.linkedList = linkedList;
+    }
+
+    @Override
+    public boolean hasNext() {
+        return currentIndex < linkedList.size();
+    }
+
+    @Override
+    public Byte next() {
+        return linkedList.get(currentIndex++);
     }
 }
diff --git a/list/src/main/java/de/vivi/list/Main.java b/list/src/main/java/de/vivi/list/Main.java
index 963485d..3057002 100644
--- a/list/src/main/java/de/vivi/list/Main.java
+++ b/list/src/main/java/de/vivi/list/Main.java
@@ -33,10 +33,10 @@ public class Main {
 
 
         System.out.println(list);
-
+        System.out.println(list.copy());
 //        list.remove(4);
 //        list.contains(5);
-        System.out.println(list.contains(2));
+//        System.out.println(list.contains(2));
 
 //        list.add(0, (byte) 99);
 //        list.add(3, (byte) 99);
@@ -79,9 +79,9 @@ public class Main {
 //        list.clear();
 //        System.out.println(list);
 
-//        for (byte value : list) {
-//            System.out.print("Hello it " + value + " ");
-//        }
+        for (byte value : list) {
+            System.out.print(value + " ");
+        }
 
     }