diff --git a/src/com/tofvesson/async/Test.java b/src/com/tofvesson/async/Test.java
index 87d2524..6cd9918 100644
--- a/src/com/tofvesson/async/Test.java
+++ b/src/com/tofvesson/async/Test.java
@@ -1,69 +1,9 @@
 package com.tofvesson.async;
 
-import jdk.internal.org.objectweb.asm.ClassWriter;
-import jdk.internal.org.objectweb.asm.MethodVisitor;
-import static org.objectweb.asm.Opcodes.*;
+import com.tofvesson.collections.ShiftingList;
 
 public class Test {
-
-    public Test(){}
-
     public static void main(String[] args) throws Exception {
-
-
-
-
-
-        // Create new class with an automatically calculated max variable and constant pool
-        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
-
-        // Start visiting class
-        cw.visit(V1_8 /* Version of Java to compile with */,
-                ACC_PUBLIC /* Access permissions */,
-                "TClass", /* Simple class name */
-                "Lcom/tofvesson/async/TClass;", /* Fully qualified class signature */
-                "Ljava/lang/Object;", /* Superclass */
-                null /* Interfaces */
-        );
-
-        // Start visiting constructor "TClass()"
-        MethodVisitor mv = cw.visitMethod(
-                ACC_PUBLIC, /* Access permissions */
-                "<init>", /* Method name */
-                "Lcom/tofvesson/async/TClass;", /* Method descriptor */
-                "()V", /* Method signature */
-                null /* Exceptions */
-        );
-
-        // Invoke super() on inherited Object
-        mv.visitVarInsn(ALOAD, 0); // Load "this" from local constant pool and put on stack
-        mv.visitMethodInsn(
-                INVOKESPECIAL, /* How to invoke method ("Special" for invoking super()) */
-                "java/lang/Object", /* Class where method is defined */
-                "<init>", /* Method to invoke */
-                "()V", /* Target method signature */
-                false /* Is target object an object generified to an interface (interface method) */
-        );
-
-        mv.visitMethodInsn(INVOKESTATIC, "com/tofvesson/async/Test", "test", "()V", false);
-
-        // Return
-        mv.visitInsn(RETURN);
-
-        // Stop visiting constructor
-        mv.visitEnd();
-
-        // Stop visiting class
-        cw.visitEnd();
-
-
+        ShiftingList<String, String> l = new ShiftingList<>(5);
     }
-
-    public void run(){
-        System.out.println("Hello");
-    }
-
-    private static void test(){ System.out.println("Called incorrectly"); }
-
-
 }
diff --git a/src/com/tofvesson/collections/ShiftingList.java b/src/com/tofvesson/collections/ShiftingList.java
new file mode 100644
index 0000000..0f78026
--- /dev/null
+++ b/src/com/tofvesson/collections/ShiftingList.java
@@ -0,0 +1,280 @@
+package com.tofvesson.collections;
+
+
+import java.util.*;
+
+public class ShiftingList<K, V> implements Map<K, V> {
+
+    final ShiftingSet<K> keys;
+    final ShiftingSet<V> values;
+
+
+    public ShiftingList(int maxSize){
+        this(maxSize, 0.75f);
+    }
+
+    public ShiftingList(int maxSize, float load){
+        keys = new ShiftingSet<>(maxSize, load);
+        values = new ShiftingSet<>(maxSize, load);
+    }
+
+
+    @Override
+    public int size() {
+        return 0;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return true;
+    }
+
+    @Override
+    public boolean containsKey(Object key) {
+        return false;
+    }
+
+    @Override
+    public boolean containsValue(Object value) {
+        return false;
+    }
+
+    @Override
+    public V get(Object key) {
+        return null;
+    }
+
+    @Override
+    public V remove(Object key) {
+        return null;
+    }
+
+    @Override
+    public void putAll(Map m) {
+
+    }
+
+    @Override
+    public void clear() {
+
+    }
+
+    @Override
+    public Set<K> keySet() {
+
+        return null;
+    }
+
+    @Override
+    public Collection<V> values() {
+        return null;
+    }
+
+    @Override
+    public Set<Entry<K, V>> entrySet() {
+        return null;
+    }
+
+    @Override
+    public V put(K key, V value) {
+        return null;
+    }
+
+
+    /**
+     * Entries dynamically update as underlying sets change
+     * @param <K>
+     * @param <V>
+     */
+    static class ShiftingEntry<K, V> implements Entry<K, V>{
+
+        private ShiftingSet<K> keys;
+        private ShiftingSet<V> values;
+        private int index = 0;
+
+        public ShiftingEntry(ShiftingSet<K> keys, ShiftingSet<V> values, int index){
+            this.keys = keys;
+            this.values = values;
+            this.index = index;
+        }
+
+        @Override
+        public K getKey() {
+            return (K) keys.set[index];
+        }
+
+        @Override
+        public V getValue() {
+            return (V) values.set[index];
+        }
+
+        @Override
+        public V setValue(V value) {
+            V v=getValue();
+            values.set[index]=value;
+            return v;
+        }
+    }
+
+    static class ShiftingSet<E> implements Set<E>{
+
+        Object[] set = new Object[1];
+        final int maxSize;
+        final float loadFactor;
+        int populatedEntries = 0;
+
+        public ShiftingSet(int maxSize, float loadFactor){
+            this.maxSize = maxSize<=0?20:maxSize;
+            this.loadFactor = loadFactor<=0.1?0.75f:loadFactor;
+        }
+
+        @Override
+        public int size() {
+            return set.length;
+        }
+
+        @Override
+        public boolean isEmpty() {
+            return set.length==1 && set[0]==null;
+        }
+
+        @Override
+        public boolean contains(Object o) {
+            if(o==null) return false;
+            for(Object o1 : set)
+                if(o.equals(o1))
+                    return true;
+            return false;
+        }
+
+        @Override
+        public Iterator<E> iterator() {
+            return new ShiftingIterator<>(this);
+        }
+
+        @Override
+        public Object[] toArray() {
+            return set;
+        }
+
+        @Override
+        public <T> T[] toArray(T[] a) {
+            return (T[]) set;
+        }
+
+        @Override
+        public boolean add(E e) {
+            if(contains(e)) return false;
+            populatedEntries=populatedEntries<maxSize?populatedEntries+1:populatedEntries;
+            Object[] o = new Object[Math.min((int)(100/(100/populatedEntries*loadFactor)), maxSize)];                   // Dynamically update array size according to loadFactor and max Size
+            System.arraycopy(set, 1, o, 2, o.length - 2);
+            o[0] = e;
+            return true;
+        }
+
+        @Override
+        public boolean remove(Object o1) {
+            boolean b = false;
+            for(int i = 0; i<populatedEntries; ++i) if(o1.equals(set[i])){ set[i] = null; b = true; --populatedEntries; break; }
+            adaptLoad();
+            shift();
+            return b;
+        }
+
+        @Override
+        public boolean containsAll(Collection<?> c) {
+            int i = 0;
+            int j = 0;
+            for(Object o : c) {
+                ++j;
+                for (Object o1 : set)
+                    if (o.equals(o1)) ++i;
+            }
+            return j==i;
+        }
+
+        @Override
+        public boolean addAll(Collection<? extends E> c) {
+            ArrayList<Object> l = new ArrayList<>();
+            for(Object e : c)
+                for (Object o : set) {
+                    if (e.equals(o)){
+                        l.remove(e);
+                        break;
+                    }
+                    l.add(e);
+                }
+            if(l.size()==0) return false;
+            int tmp = populatedEntries;
+            populatedEntries=populatedEntries+l.size()<maxSize?populatedEntries+l.size():maxSize;
+            Object[] o = new Object[Math.min((int)(100/(100/populatedEntries*loadFactor)), maxSize)];                   // Create new array
+            for(int i = l.size(); i>0; --i) if(i<o.length-1) o[l.size()-i] = l.get(i);                                  // Move new values to start of array relative to their position
+            if(l.size()<tmp) for(int i = 0; i<tmp-l.size(); ++i) if(l.size()+i<o.length) o[l.size()] = set[i];          // Move old values to relative location
+            set = o;                                                                                                    // Update reference
+            return true;
+        }
+
+        @Override
+        public boolean retainAll(Collection<?> c) {
+            return false;
+        }
+
+        @Override
+        public boolean removeAll(Collection<?> c) {
+            int i = 0;                                                                                                  // Tracker for how many entries were removed
+            for(Object o : c)                                                                                           // Check against every element to remove
+                for(int j = 0; j<populatedEntries; ++j)                                                                 // Check again all populated entries
+                    if(o.equals(set[j])){
+                        ++i;
+                        set[j] = null;
+                    }
+            if(i==0) return false;
+            shift();
+            return true;
+        }
+
+        @Override
+        public void clear() {
+            populatedEntries = 0;
+            set = new Object[1];
+        }
+
+        /**
+         * Shifts the values to fill unpopulated array slots.
+         */
+        void shift(){
+            for(int i = 0; i<populatedEntries; ++i) if(set[i]==null) System.arraycopy(set,i+1,set,i,populatedEntries-i);// Shift populated slots towards the start of the array
+        }
+
+        /**
+         * Adapt array size according to populated elements and load factor.
+         */
+        void adaptLoad(){
+            if(((int)(100/(100/populatedEntries*loadFactor)))==set.length) return;
+            Object[] o = new Object[Math.min((int)(100/(100/populatedEntries*loadFactor)), maxSize)];
+            System.arraycopy(set, 0, o, 0, o.length);
+            set = o;
+        }
+    }
+
+    static class ShiftingIterator<E> implements Iterator<E>{
+
+        private final ShiftingSet<E> s;
+        private int ctr = -1;
+
+        public ShiftingIterator(ShiftingSet<E> s){
+            this.s=s;
+        }
+
+        @Override
+        public boolean hasNext() {
+            return ctr+1<=s.set.length-1;
+        }
+
+        @Override
+        public E next() {
+            if(!hasNext()) return null;
+            return (E) s.set[++ctr];
+        }
+    }
+}