diff --git a/com/xgiovio/ArrayIndexListTest.java b/com/xgiovio/ArrayIndexListTest.java
index 6af9441..6943f9d 100644
--- a/com/xgiovio/ArrayIndexListTest.java
+++ b/com/xgiovio/ArrayIndexListTest.java
@@ -1,10 +1,7 @@
 package com.xgiovio;
 
 import arraylist.ArrayIndexList;
-import general_utility.test_object;
-import sequence.NodeSequence;
-import sequence.Sequence;
-import stack.NodeStack;
+import com.xgiovio.general_utility.test_object;
 
 import java.util.Iterator;
 
diff --git a/com/xgiovio/ArraySequenceTest.java b/com/xgiovio/ArraySequenceTest.java
index a3a11d6..83a6f7b 100644
--- a/com/xgiovio/ArraySequenceTest.java
+++ b/com/xgiovio/ArraySequenceTest.java
@@ -1,6 +1,6 @@
 package com.xgiovio;
 
-import general_utility.test_object;
+import com.xgiovio.general_utility.test_object;
 import position.Position;
 import sequence.ArraySequence;
 
diff --git a/com/xgiovio/ArrayTest.java b/com/xgiovio/ArrayTest.java
index 648b9e4..2b7e455 100644
--- a/com/xgiovio/ArrayTest.java
+++ b/com/xgiovio/ArrayTest.java
@@ -1,7 +1,6 @@
 package com.xgiovio;
 
-import general_utility.test_object;
-import stack.ArrayStack;
+import com.xgiovio.general_utility.test_object;
 import stack.NodeStack;
 
 /**
diff --git a/com/xgiovio/DequeTest.java b/com/xgiovio/DequeTest.java
index f611f36..5315eff 100644
--- a/com/xgiovio/DequeTest.java
+++ b/com/xgiovio/DequeTest.java
@@ -1,9 +1,7 @@
 package com.xgiovio;
 
-import deque.Deque;
 import deque.NodeDeque;
-import general_utility.test_object;
-import stack.NodeStack;
+import com.xgiovio.general_utility.test_object;
 
 /**
  * Created with xgiovio.macbookair.
diff --git a/com/xgiovio/HashDictionaryChainingTest.java b/com/xgiovio/HashDictionaryChainingTest.java
new file mode 100644
index 0000000..4d14ce9
--- /dev/null
+++ b/com/xgiovio/HashDictionaryChainingTest.java
@@ -0,0 +1,88 @@
+package com.xgiovio;
+
+import dictionary.HashDictionaryChaining;
+import dictionary.Logfile;
+import exceptions.EmptyListException;
+import priorityqueue.Entry;
+
+import java.security.InvalidKeyException;
+import java.util.Iterator;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 11/05/2014
+ * Time: 21:17
+ */
+public class HashDictionaryChainingTest {
+
+    public static void main(String[] args) throws InvalidKeyException{
+
+        Logfile<String,Integer> def = new Logfile<String, Integer>();
+
+        HashDictionaryChaining<String,Integer> h = new HashDictionaryChaining<String, Integer>(def,5);
+
+        System.out.println(h.load_factor());
+
+        h.insert("1", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+
+        h.insert("2", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("3", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("4", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("5", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("6", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("7", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("7", 200);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("7", 511);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("8", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("9", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        Entry<String,Integer> t = h.insert("10", 100);
+
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+
+        System.out.println(h);
+        System.out.println(h.raw_size());
+
+
+        Iterator<Entry<String,Integer>> ite =  h.findAll("9").iterator();
+        System.out.println(ite.next());
+
+
+    }
+
+}
diff --git a/com/xgiovio/HashDictionaryLinearProbingTest.java b/com/xgiovio/HashDictionaryLinearProbingTest.java
new file mode 100644
index 0000000..d027bc2
--- /dev/null
+++ b/com/xgiovio/HashDictionaryLinearProbingTest.java
@@ -0,0 +1,102 @@
+package com.xgiovio;
+
+import dictionary.HashDictionaryLinearProbing;
+import priorityqueue.Entry;
+import priorityqueue.MyEntry;
+
+import java.security.InvalidKeyException;
+import java.util.Iterator;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 11/05/2014
+ * Time: 21:17
+ */
+public class HashDictionaryLinearProbingTest {
+
+    public static void main(String[] args) throws InvalidKeyException{
+
+        MyEntry<String,Integer> def = new MyEntry<String, Integer>("null",0);
+
+        HashDictionaryLinearProbing<String,Integer> h = new HashDictionaryLinearProbing(def,5);
+
+        System.out.println(h.load_factor());
+
+        h.insert("1", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+
+        h.insert("2", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("3", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("4", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("5", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("6", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("7", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("7", 200);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("7", 511);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("8", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        h.insert("9", 100);
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+        Entry<String,Integer> t = h.insert("10", 100);
+
+        System.out.println(h.load_factor());
+        System.out.println(h.size());
+
+
+        System.out.println(h);
+        System.out.println(h.raw_size());
+
+
+        Iterator<Entry<String,Integer>> ite =  h.findAll("7").iterator();
+        System.out.println(ite.next());
+        System.out.println(ite.next());
+        System.out.println(ite.next());
+
+        System.out.println(h.load_factor());
+        h.remove(t);
+        System.out.println(h);
+        System.out.println(h.load_factor());
+
+
+
+        Entry<String,Integer> f = h.insert("7", 100);
+        System.out.println(h);
+        h.remove(f);
+        System.out.println(h);
+
+
+
+    }
+
+}
diff --git a/com/xgiovio/Main.java b/com/xgiovio/Main.java
index 24454ef..b5c48d5 100644
--- a/com/xgiovio/Main.java
+++ b/com/xgiovio/Main.java
@@ -3,6 +3,6 @@ package com.xgiovio;
 public class Main {
 
     public static void main(String[] args) {
-	// write your code here
+
     }
 }
diff --git a/com/xgiovio/NodePositionListTest.java b/com/xgiovio/NodePositionListTest.java
index e1f38e5..3a5bcee 100644
--- a/com/xgiovio/NodePositionListTest.java
+++ b/com/xgiovio/NodePositionListTest.java
@@ -1,7 +1,5 @@
 package com.xgiovio;
 
-import arraylist.ArrayIndexList;
-import general_utility.test_object;
 import position.NodePositionList;
 import position.Position;
 
diff --git a/com/xgiovio/NodeSequenceTest.java b/com/xgiovio/NodeSequenceTest.java
index a242e28..4b6ad11 100644
--- a/com/xgiovio/NodeSequenceTest.java
+++ b/com/xgiovio/NodeSequenceTest.java
@@ -1,7 +1,6 @@
 package com.xgiovio;
 
-import arraylist.ArrayIndexList;
-import general_utility.test_object;
+import com.xgiovio.general_utility.test_object;
 import sequence.NodeSequence;
 
 /**
diff --git a/com/xgiovio/QueueTest.java b/com/xgiovio/QueueTest.java
index 9aedaae..78e9015 100644
--- a/com/xgiovio/QueueTest.java
+++ b/com/xgiovio/QueueTest.java
@@ -1,7 +1,6 @@
 package com.xgiovio;
 
-import general_utility.test_object;
-import queue.ArrayQueue;
+import com.xgiovio.general_utility.test_object;
 import queue.NodeQueue;
 
 /**
diff --git a/general_utility/test_object.java b/com/xgiovio/general_utility/test_object.java
similarity index 90%
rename from general_utility/test_object.java
rename to com/xgiovio/general_utility/test_object.java
index 71a93c6..9349e89 100644
--- a/general_utility/test_object.java
+++ b/com/xgiovio/general_utility/test_object.java
@@ -1,4 +1,4 @@
-package general_utility;
+package com.xgiovio.general_utility;
 
 /**
  * Created with xgiovio.macbookair.
diff --git a/com/xgiovio/hash/functions.java b/com/xgiovio/hash/functions.java
new file mode 100644
index 0000000..7d6514f
--- /dev/null
+++ b/com/xgiovio/hash/functions.java
@@ -0,0 +1,31 @@
+package com.xgiovio.hash;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 11/05/2014
+ * Time: 19:25
+ */
+public class functions {
+
+
+    //http://m.smithworx.com/cs235/notes/view.php?file=extra%20notes/rodham/35-36-com.xgiovio.hash-tables/HashFunctions.java
+    public static int hash_horner( String key, int tableSize ) {
+
+        int hashVal = 0;
+
+        for ( int i = 0; i < key.length(); ++i ) {
+            hashVal = (hashVal * 37) + key.charAt( i );
+        }
+
+        hashVal %= tableSize;
+
+        if ( hashVal < 0 ) {
+            hashVal += tableSize;
+        }
+
+        return hashVal;
+    }
+
+
+}
diff --git a/dictionary/Dictionary.java b/dictionary/Dictionary.java
new file mode 100644
index 0000000..bcfd78e
--- /dev/null
+++ b/dictionary/Dictionary.java
@@ -0,0 +1,24 @@
+package dictionary;
+
+import exceptions.InvalidEntryException;
+import priorityqueue.Entry;
+
+import java.security.InvalidKeyException;
+
+
+public interface Dictionary<K,V> {
+
+  public int size();
+
+  public boolean isEmpty();
+
+  public Entry<K,V> find(K key)    throws InvalidKeyException;
+
+  public Iterable<Entry<K,V>> findAll(K key)   throws InvalidKeyException;
+
+  public Entry<K,V> insert(K key, V value)    throws InvalidKeyException;
+
+  public Entry<K,V> remove(Entry<K, V> e)     throws InvalidEntryException;
+
+  public Iterable<Entry<K,V>> entries(); 
+}
diff --git a/dictionary/HashDictionaryChaining.java b/dictionary/HashDictionaryChaining.java
new file mode 100644
index 0000000..bcaa415
--- /dev/null
+++ b/dictionary/HashDictionaryChaining.java
@@ -0,0 +1,192 @@
+package dictionary;
+
+import arraylist.ArrayIndexList;
+import arraylist.IndexList;
+import exceptions.HashExceptionKey;
+import exceptions.InvalidEntryException;
+import position.NodePositionList;
+import position.PositionList;
+import priorityqueue.Entry;
+import priorityqueue.MyEntry;
+import sun.rmi.log.ReliableLog;
+
+import java.security.InvalidKeyException;
+import java.util.Iterator;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 11/05/2014
+ * Time: 19:28
+ */
+public class HashDictionaryChaining <K,V> implements Dictionary<K,V> {
+
+        IndexList<Logfile<K,V>> table = null;
+        Logfile<K,V> AVAIBLE = null;
+        int avaible_slots = 0;
+        int elements = 0;
+
+    public HashDictionaryChaining ( Logfile<K,V> IN_AVAIBLE, int in_size){
+        table = new ArrayIndexList<Logfile<K, V>>(in_size);
+        AVAIBLE = IN_AVAIBLE;
+
+        for (int i= 0 ; i< in_size ;i++){
+            table.add(i,AVAIBLE);
+            avaible_slots ++;
+        }
+    }
+
+    public   float load_factor () throws InvalidKeyException{
+        float ret =  (size() / (float)raw_size());
+        if ( ret >= 0.9 ) {
+            reformat();
+            return load_factor();
+        }
+        return ret;
+    }
+
+    public  int raw_size (){
+        return table.size();
+    }
+
+    @Override
+    public int size() {
+        return elements;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return (size() == 0);
+    }
+
+    protected int hash ( K key, int size){
+
+        if (  (key instanceof String) )
+            return com.xgiovio.hash.functions.hash_horner( (String)key ,size );
+        throw new HashExceptionKey();
+    }
+
+
+    @Override
+    public Entry<K, V> find(K key) throws InvalidKeyException {
+
+            checkKey(key);
+            int h = hash(key, raw_size());
+            if (table.get(h) == AVAIBLE)
+                return null;
+            Logfile<K, V> n = table.get(h);
+            return n.find(key);
+    }
+
+    @Override
+    public Iterable<Entry<K, V>> findAll(K key) throws InvalidKeyException {
+        checkKey(key);
+        int h = hash(key,raw_size());
+        if (table.get(h) == AVAIBLE)
+            return null;
+        Logfile<K, V> n = table.get(h);
+        return n.entries();
+    }
+
+    @Override
+    public Entry<K, V> insert(K key, V value) throws InvalidKeyException {
+             checkKey(key);
+             if (load_factor() >= 0.9 )
+                 reformat();
+             int h = hash(key,raw_size());
+             if (table.get(h) == AVAIBLE) {
+                 Logfile<K, V> n = new Logfile<K, V>();
+                 table.set(h,n);
+                 avaible_slots--;
+                 elements++;
+                 return n.insert(key,value);
+             } else {
+                 Logfile<K, V> n = table.get(h);
+                 elements++;
+                 return n.insert(key,value);
+             }
+    }
+
+    @Override
+    public Entry<K, V> remove(Entry<K, V> e) throws InvalidEntryException {
+        if (e == null)
+            throw new InvalidEntryException();
+        int h = hash(e.getKey(),raw_size());
+        if (table.get(h) == AVAIBLE)
+            throw new InvalidEntryException();
+        Logfile<K, V> n = table.get(h);
+        Entry<K,V> t =  n.remove(e);
+        elements--;
+        if (n.size() == 0){
+            table.set(h,AVAIBLE);
+            avaible_slots++;
+        }
+       return t;
+    }
+
+    @Override
+    public Iterable<Entry<K, V>> entries() {
+
+        NodePositionList<Entry<K,V>> ret = new NodePositionList<Entry<K, V>>();
+
+        for (int i = 0 ; i< raw_size() ;i++){
+            if (table.get(i) != AVAIBLE){
+                Iterator<Entry<K,V>> local_it = table.get(i).entries().iterator();
+                for (;local_it.hasNext();){
+                    ret.addLast(local_it.next());
+                }
+            }
+
+        }
+        return ret;
+    }
+
+
+    protected void checkKey(K key) throws InvalidKeyException {
+        if (key == null )
+            throw new InvalidKeyException("Invalid key");
+    }
+
+
+    void reformat () throws InvalidKeyException{
+
+        Iterable<Entry<K,V>> ite = entries();
+        int new_size = raw_size() * 2;
+        IndexList<Logfile<K,V>>  table2 = new ArrayIndexList<Logfile<K, V>>(new_size);
+        avaible_slots = 0;
+        elements = 0;
+
+        for (int i= 0 ; i< (new_size) ;i++){
+            table2.add(i,AVAIBLE);
+        }
+        table = table2;
+
+        for (Entry<K,V> e : ite){
+            insert(e.getKey(),e.getValue());
+
+        }
+    }
+
+
+    public String toString() {
+
+        Iterator<Entry<K,V>> it = entries().iterator();
+
+        String to_return = "";
+        to_return = to_return + "[";
+
+        for (;it.hasNext();){
+            Entry<K,V>  t = it.next();
+
+            if (it.hasNext())  {
+
+                to_return+=(t.toString() + " , ");
+            }    else {
+
+                to_return+=(t.toString());
+            }
+        }
+
+        return to_return+= "]";
+    }
+}
diff --git a/dictionary/HashDictionaryLinearProbing.java b/dictionary/HashDictionaryLinearProbing.java
new file mode 100644
index 0000000..cb8d0eb
--- /dev/null
+++ b/dictionary/HashDictionaryLinearProbing.java
@@ -0,0 +1,229 @@
+package dictionary;
+
+import arraylist.ArrayIndexList;
+import arraylist.IndexList;
+import exceptions.HashExceptionKey;
+import exceptions.InvalidEntryException;
+import position.NodePositionList;
+import priorityqueue.Entry;
+import priorityqueue.MyEntry;
+
+import java.security.InvalidKeyException;
+import java.util.Iterator;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 11/05/2014
+ * Time: 19:28
+ */
+public class HashDictionaryLinearProbing<K,V> implements Dictionary<K,V> {
+
+        IndexList<Entry<K,V>> table = null;
+        Entry<K,V> AVAIBLE = null;
+        int avaible_slots = 0;
+        int elements = 0;
+
+    public HashDictionaryLinearProbing(Entry<K, V> IN_AVAIBLE, int in_size){
+        table = new ArrayIndexList<Entry<K, V>>(in_size);
+        AVAIBLE = IN_AVAIBLE;
+
+        for (int i= 0 ; i< in_size ;i++){
+            table.add(i,AVAIBLE);
+            avaible_slots ++;
+        }
+    }
+
+    public   float load_factor () throws InvalidKeyException{
+        float ret =  (size() / (float)raw_size());
+        if ( ret >= 0.5 ) {
+            reformat();
+            return load_factor();
+        }
+        return ret;
+    }
+
+    public  int raw_size (){
+        return table.size();
+    }
+
+    @Override
+    public int size() {
+        return elements;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return (size() == 0);
+    }
+
+    protected int hash ( K key, int size){
+
+        if (  (key instanceof String) )
+            return com.xgiovio.hash.functions.hash_horner( (String)key ,size );
+        throw new HashExceptionKey();
+    }
+
+
+
+    @Override
+    public Entry<K, V> find(K key) throws InvalidKeyException {
+
+            checkKey(key);
+            int h = hash(key, raw_size());
+            int count = 0;
+            int i = 0;
+            for (;count < raw_size();){
+                if (table.get(h+i) == AVAIBLE)
+                    return null;
+                if (table.get(h+i).getKey().equals(key))
+                    return table.get(h+i);
+                i= (i + 1)% raw_size();
+                count++;
+            }
+        return null;
+    }
+
+    @Override
+    public Iterable<Entry<K, V>> findAll(K key) throws InvalidKeyException {
+        checkKey(key);
+        NodePositionList<Entry<K,V>> to_return = new NodePositionList<Entry<K, V>>();
+        int h = hash(key, raw_size());
+        int count = 0;
+        int i = 0;
+        for (;count < raw_size();){
+            if (table.get(h+i) == AVAIBLE)
+                return to_return;
+            if (table.get(h+i).getKey().equals(key))
+                to_return.addLast( table.get(h+i));
+            i= (i + 1)% raw_size();
+            count++;
+        }
+        return to_return;
+    }
+
+    @Override
+    public Entry<K, V> insert(K key, V value) throws InvalidKeyException {
+             checkKey(key);
+             if (load_factor() >= 0.5 )
+                 reformat();
+             int h = hash(key,raw_size());
+             if (table.get(h) == AVAIBLE) {
+                 MyEntry<K, V> n = new MyEntry<K, V>(key,value);
+                 table.set(h,n);
+                 avaible_slots--;
+                 elements++;
+                 return n;
+             } else {
+                 int i = 1;
+                 int count = 1;
+                 for ( ; count < raw_size() ;) {
+                     if (table.get(h + i) == AVAIBLE) {
+                         MyEntry<K, V> n = new MyEntry<K, V>(key, value);
+                         table.set(h + i, n);
+                         avaible_slots--;
+                         elements++;
+                         return n;
+                     }
+                     i = (i + 1) % raw_size();
+                     count++;
+                 }
+                 return null; // non dovresti essere qui a causa del load factor
+             }
+    }
+
+    @Override
+    public Entry<K, V> remove(Entry<K, V> e) throws InvalidEntryException {
+        if (e == null)
+            throw new InvalidEntryException();
+        int h = hash(e.getKey(),raw_size());
+        if (table.get(h) == AVAIBLE)
+            throw new InvalidEntryException();
+        if (table.get(h) == e) {
+            Entry<K, V> removed = table.get(h);
+            table.remove(h);
+            table.set(h,AVAIBLE);
+            elements--;
+            avaible_slots++;
+            return removed;
+        }
+        int count = 1;
+        for (int i = 1; count < raw_size() ; i = (i + 1) % raw_size()){
+            if (table.get(h + i) == AVAIBLE)
+                throw new InvalidEntryException();
+            if (table.get(h + i) == e) {
+                Entry<K, V> removed = table.get(h + i);
+                table.remove(h + i);
+                table.set(h + i,AVAIBLE);
+                elements--;
+                avaible_slots++;
+                return removed;
+            }
+            count++;
+        }
+        throw new InvalidEntryException();
+
+    }
+
+    @Override
+    public Iterable<Entry<K, V>> entries() {
+
+        NodePositionList<Entry<K,V>> ret = new NodePositionList<Entry<K, V>>();
+
+        for (int i = 0 ; i< raw_size() ;i++){
+            if (table.get(i) != AVAIBLE){
+                ret.addLast(table.get(i));
+            }
+        }
+        return ret;
+    }
+
+
+    protected void checkKey(K key) throws InvalidKeyException {
+        if (key == null )
+            throw new InvalidKeyException("Invalid key");
+    }
+
+
+    void reformat () throws InvalidKeyException{
+
+        Iterable<Entry<K,V>> ite = entries();
+        int new_size = raw_size() * 2;
+        IndexList<Entry<K,V>>  table2 = new ArrayIndexList<Entry<K, V>>(new_size);
+        avaible_slots = 0;
+        elements = 0;
+
+        for (int i= 0 ; i< (new_size) ;i++){
+            table2.add(i,AVAIBLE);
+        }
+        table = table2;
+
+        for (Entry<K,V> e : ite){
+            insert(e.getKey(),e.getValue());
+
+        }
+    }
+
+
+    public String toString() {
+
+        Iterator<Entry<K,V>> it = entries().iterator();
+
+        String to_return = "";
+        to_return = to_return + "[";
+
+        for (;it.hasNext();){
+            Entry<K,V>  t = it.next();
+
+            if (it.hasNext())  {
+
+                to_return+=(t.toString() + " , ");
+            }    else {
+
+                to_return+=(t.toString());
+            }
+        }
+
+        return to_return+= "]";
+    }
+}
diff --git a/dictionary/Logfile.java b/dictionary/Logfile.java
new file mode 100644
index 0000000..712bc01
--- /dev/null
+++ b/dictionary/Logfile.java
@@ -0,0 +1,131 @@
+package dictionary;
+
+import exceptions.InvalidEntryException;
+import position.NodePositionList;
+import position.Position;
+import priorityqueue.Entry;
+import priorityqueue.MyEntry;
+
+import java.security.InvalidKeyException;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 11/05/2014
+ * Time: 19:04
+ */
+public class Logfile<K,V> implements Dictionary<K,V> {
+
+      NodePositionList<Entry<K,V>> list = new NodePositionList<Entry<K,V>>();
+
+    @Override
+    public int size() {
+        return list.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return list.isEmpty();
+    }
+
+    @Override
+    public Entry<K, V> find(K key) throws InvalidKeyException {
+        checkKey(key);
+        for(Position<Entry<K,V>> p: list.positions()){
+            Entry<K,V> e= p.element();
+            if(e.getKey().equals(key)){
+                return e;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Iterable<Entry<K, V>> findAll(K key) throws InvalidKeyException {
+        checkKey(key);
+        NodePositionList<Entry<K,V>> to_return = new NodePositionList<Entry<K,V>>();
+        for(Position<Entry<K,V>> p: list.positions()){
+            Entry<K,V> e= p.element();
+            if(e.getKey().equals(key)){
+                to_return.addLast(e);
+            }
+        }
+        return to_return;
+    }
+
+    @Override
+    public Entry<K, V> insert(K key, V value) throws InvalidKeyException {
+        checkKey(key);
+        LocationAwareEntry<K,V> t = new LocationAwareEntry<K, V>(key,value);
+        list.addLast(t);
+        t.setLocation(list.last());
+        return  t;
+    }
+
+    @Override
+    public Entry<K, V> remove(Entry<K, V> e) throws InvalidEntryException {
+        LocationAwareEntry<K,V> t = checkEntry(e);
+        list.remove(t.location());
+        t.setLocation(null);
+        return t;
+    }
+
+    @Override
+    public Iterable<Entry<K, V>> entries() {
+        return list;
+    }
+
+    //aux
+    protected void checkKey(K key) throws InvalidKeyException {
+        if (key == null )
+            throw new InvalidKeyException("Invalid key");
+    }
+
+    // inner class
+    protected static class LocationAwareEntry<K,V> extends MyEntry<K,V> {
+        protected Position<Entry<K, V>> loc = null;
+
+        public LocationAwareEntry(K k, V v) {
+            super(k, v);
+        }
+
+        public LocationAwareEntry(K k, V v, Position pos) {
+            super(k, v);
+            loc = pos;
+        }
+
+
+
+        protected Position < Entry<K,V>> location() {
+            return loc;
+        }
+        protected Position < Entry<K,V> >setLocation(Position< Entry<K,V>> pos) {
+            Position <Entry<K,V>> oldPosition = location();
+            loc = pos;
+            return oldPosition;
+        }
+        protected K setKey(K k) {
+            K oldKey = getKey();
+            key = k;
+            return oldKey;
+        }
+        protected V setValue(V v) {
+            V oldValue = getValue();
+            value = v;
+            return oldValue;
+        }
+
+        public String toString() { return "(" + key  + "," + value + ")"; }
+
+
+
+    }
+
+
+    protected LocationAwareEntry<K,V>   checkEntry(Entry<K,V> e) throws InvalidEntryException
+    {
+        if(e == null || !(e instanceof LocationAwareEntry) || isEmpty()  )
+            throw new InvalidEntryException("entrata non valida");
+        return (LocationAwareEntry) e;
+    }
+}
diff --git a/exceptions/HashExceptionKey.java b/exceptions/HashExceptionKey.java
new file mode 100644
index 0000000..04c1d4c
--- /dev/null
+++ b/exceptions/HashExceptionKey.java
@@ -0,0 +1,18 @@
+package exceptions;
+
+/**
+ * Signals that the boundaries of a data structure have been illegally
+ * traversed (e.g. past the end of a list).
+ * @author Roberto Tamassia
+ */
+//Copyright (c) 2003 Brown University, Providence, RI
+//Additional modifications and methods by xgiovio
+
+public class HashExceptionKey extends RuntimeException {
+  public HashExceptionKey(String message) {
+    super (message);
+  }
+    public HashExceptionKey() {
+        super ("Please use a string key or define an hash function");
+    }
+}
diff --git a/map/ListMap.java b/map/ListMap.java
new file mode 100644
index 0000000..3adf21d
--- /dev/null
+++ b/map/ListMap.java
@@ -0,0 +1,113 @@
+package map;
+
+import position.NodePositionList;
+import position.Position;
+import position.PositionList;
+import priorityqueue.Entry;
+import priorityqueue.MyEntry;
+
+import java.security.InvalidKeyException;
+import java.util.Iterator;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 11/05/2014
+ * Time: 18:01
+ */
+public class ListMap<K,V> implements Map<K,V> {
+
+    private PositionList<Entry<K,V>> L;
+
+    public ListMap(){
+        L =new NodePositionList<Entry<K,V>>();
+    }
+
+    @Override
+    public int size() {
+        return L.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return (L.isEmpty());
+    }
+
+
+
+
+    public V put(K key, V value) throws InvalidKeyException {
+        checkKey(key);
+        for(Position<Entry<K,V>> p: L.positions()){
+            Entry<K,V> e= p.element();
+            if(e.getKey().equals(key)){
+                V v = e.getValue();
+                L.set(p, new MyEntry<K,V>(key,value));
+                return v;
+            } }
+        L.addLast(new MyEntry<K,V>(key,value));
+        return null;
+    }
+
+    public V get(K key) throws InvalidKeyException{
+        checkKey(key);
+        for(Position<Entry<K,V>> p: L.positions()){
+            Entry<K,V> e= p.element();
+            if(e.getKey().equals(key)) return e.getValue();
+        }
+        return null;
+    }
+
+
+    public V remove(K key) throws InvalidKeyException {
+        checkKey(key);
+        for(Position<Entry<K,V>> p: L.positions()){
+            Entry<K,V> e= p.element();
+            if(e.getKey().equals(key)){
+                V v = e.getValue();
+                L.remove(p);
+                return v;
+            }
+        }
+        return null;
+    }
+
+    @Override
+    public Iterable<K> keys() {
+        Iterator<Entry<K,V>> it = L.iterator();
+        NodePositionList<K> ret = new NodePositionList<K>();
+        for (;it.hasNext();){
+            ret.addLast(it.next().getKey());
+        }
+        return ret;
+    }
+
+    @Override
+    public Iterable<V> values() {
+        Iterator<Entry<K,V>> it = L.iterator();
+        NodePositionList<V> ret = new NodePositionList<V>();
+        for (;it.hasNext();){
+            ret.addLast(it.next().getValue());
+        }
+        return ret;
+    }
+
+    @Override
+    public Iterable<Entry<K, V>> entries() {
+        return L;
+    }
+
+
+
+    // auxiliar
+    protected void checkKey(K key) throws InvalidKeyException {
+              if (key == null )
+                throw new InvalidKeyException("Invalid key");
+    }
+
+
+    @Override
+    public String toString() {
+        return L.toString();
+    }
+}
diff --git a/map/Map.java b/map/Map.java
new file mode 100644
index 0000000..7361e96
--- /dev/null
+++ b/map/Map.java
@@ -0,0 +1,25 @@
+package map;
+
+import priorityqueue.Entry;
+
+import java.security.InvalidKeyException;
+
+public interface Map<K,V> {
+
+  public int size();
+
+  public boolean isEmpty();
+
+  public V put(K key, V value) throws InvalidKeyException;
+
+  public V get(K key) throws InvalidKeyException;
+
+  public V remove(K key) throws InvalidKeyException;
+
+  public Iterable<K> keys();
+
+  public Iterable<V> values();
+
+  public Iterable<Entry<K,V>> entries();
+}
+