first attempt

src/main/java/org/zipcoder/store/Cart.java

@@ -5,6 +5,19 @@ import java.util.Objects;
 public class Cart {
     private final long id;
 
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Cart cart = (Cart) o;
+        return id == cart.id;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id);
+    }
+
     public Cart(long id) {
         this.id = id;
     }

src/main/java/org/zipcoder/store/ListMap.java

@@ -1,6 +1,7 @@
 package org.zipcoder.store;
 
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
 
 public class ListMap implements MyMap {
@@ -9,40 +10,62 @@ public class ListMap implements MyMap {
 
     @Override
     public int size() {
-        return -1;
+        return entries.size();
     }
 
     @Override
     public boolean isEmptry() {
-        return false;
+        return (size()==0);
     }
 
     @Override
     public Cart get(User key) {
-        // find the cart associate with the key
-        return null;
+        Iterator<Entry> entryIterator = entries.iterator();
+        Entry retrievedEntry;
+        Cart retrievedCart = null;
+        while (entryIterator.hasNext()){
+            retrievedEntry = entryIterator.next();
+            if (retrievedEntry.getKey().equals(key)){
+                retrievedCart = retrievedEntry.getValue();
+            }
+        }
+        return retrievedCart;
     }
 
     @Override
     public void put(User key, Cart value) {
-        // add the key, value entry to the entries list
+        Entry newEntry = new Entry(key, value);
+        entries.add(newEntry);
     }
 
 
     @Override
     public List<User> getKeys() {
-        // get all the keys in the map
-        return null;
+        List<User> entriesUser = new ArrayList<>();
+        for (Entry e : entries){
+            entriesUser.add(e.getKey());
+        }
+        return entriesUser;
     }
 
     @Override
     public List<Cart> getValues() {
-        // get all the values in the map
-        return null;
+        List<Cart> entriesCart = new ArrayList<>();
+        for (Entry e : entries){
+            entriesCart.add(e.getValue());
+        }
+        return entriesCart;
     }
 
     @Override
     public Cart remove(User key) {
-        return null;
+        Cart removedCart = null;
+        for (int i=0; i<entries.size(); i++){
+            if (entries.get(i).getKey() == key){
+                removedCart = entries.get(i).getValue();
+                entries.remove(entries.get(i));
+            }
+        }
+        return removedCart;
     }
 }

src/main/java/org/zipcoder/store/MyHashMap.java

@@ -11,7 +11,6 @@ public class MyHashMap implements MyMap{
 
     public MyHashMap(){
         entries = new List[BUCKET_SIZE];
-
         for(int i = 0; i < BUCKET_SIZE; i++) {
             entries[i] = new ArrayList<>();
         }
@@ -19,22 +18,30 @@ public class MyHashMap implements MyMap{
 
     @Override
     public int size() {
-        return -1;
+        int totalEntries = 0;
+        for(int i = 0; i < BUCKET_SIZE; i++) {
+            totalEntries += entries[i].size();
+        }
+        return totalEntries;
     }
 
     @Override
     public boolean isEmptry() {
-        return false;
+        return (size() == 0);
     }
 
     @Override
     public Cart get(User key) {
+        for(int i = 0; i < BUCKET_SIZE; i++) {
+            entries[i] = new ArrayList<>();
+        }
         return null;
     }
 
     @Override
     public void put(User key, Cart value) {
-
+        Entry newEntry = new Entry(key, value);
+        entries[0].add(newEntry);
     }
 
     @Override

src/main/java/org/zipcoder/store/User.java

@@ -22,6 +22,21 @@ public class User {
         this.name = name;
     }
 
+    @Override
+    public boolean equals(Object o){
+        User u = (User) o;
+        if(name != null && u.getName() != null) {
+            return(id == u.getId() && name.equals(u.getName()));
+        } else {
+            return(id == u.getId());
+        }
+    }
+
+    @Override
+    public int hashCode(){
+        return Objects.hash(id, name);
+    }
+
     public long getId() {
         return id;
     }

src/test/java/org/zipcoder/store/ListMapTest.java

@@ -175,57 +175,57 @@ public class ListMapTest {
     }
 
 //    I commented this out because it takes a long time to run. Uncomment it when implement your put method, uncomment this test
-//    @Test
-//    public void testPutAndGet_WithManyItems(){
-//        // Given
-//        int numberOfEntries = 70000;
-//
-//        for (int i = 0; i < numberOfEntries; i++) {
-//            myMap.put(new User(i), new Cart(i));
-//        }
-//
-//
-//        for (int i = 0; i < numberOfEntries; i++) {
-//            // When
-//            Cart actualCart = myMap.get(new User(i));
-//            Cart expectedCart = new Cart(i);
-//
-//            // Then
-//            Assert.assertEquals(actualCart, expectedCart);
-//        }
-//    }
+    @Test
+    public void testPutAndGet_WithManyItems(){
+        // Given
+        int numberOfEntries = 70000;
+
+        for (int i = 0; i < numberOfEntries; i++) {
+            myMap.put(new User(i), new Cart(i));
+        }
+
+
+        for (int i = 0; i < numberOfEntries; i++) {
+            // When
+            Cart actualCart = myMap.get(new User(i));
+            Cart expectedCart = new Cart(i);
+
+            // Then
+            Assert.assertEquals(actualCart, expectedCart);
+        }
+    }
 
 //    BONUS
-//    @Test
-//    public void testRemove(){
-//        // Given
-//        User user1 = new User("Lena");
-//        Cart cart1 = new Cart(11);
-//
-//        User user2 = new User("Jamal");
-//        Cart cart2 = new Cart(21);
-//
-//        User user3 = new User("Kelvin");
-//        Cart cart3 = new Cart(31);
-//
-//        // When
-//        myMap.put(user1, cart1);
-//        myMap.put(user2, cart2);
-//        myMap.put(user3, cart3);
-//
-//        // Then
-//        Cart actualCart = myMap.remove(user2);
-//
-//        Assert.assertEquals(cart2, actualCart);
-//        Assert.assertNull(myMap.get(user2));
-//    }
-//
-//    @Test
-//    public void testRemove_CartNotInTheMap(){
-//        // Given
-//        User user1 = new User("Lena");
-//
-//        // When & Then
-//        Assert.assertNull(myMap.remove(user1));
-//    }
+    @Test
+    public void testRemove(){
+        // Given
+        User user1 = new User("Lena");
+        Cart cart1 = new Cart(11);
+
+        User user2 = new User("Jamal");
+        Cart cart2 = new Cart(21);
+
+        User user3 = new User("Kelvin");
+        Cart cart3 = new Cart(31);
+
+        // When
+        myMap.put(user1, cart1);
+        myMap.put(user2, cart2);
+        myMap.put(user3, cart3);
+
+        // Then
+        Cart actualCart = myMap.remove(user2);
+
+        Assert.assertEquals(cart2, actualCart);
+        Assert.assertNull(myMap.get(user2));
+    }
+
+    @Test
+    public void testRemove_CartNotInTheMap(){
+        // Given
+        User user1 = new User("Lena");
+
+        // When & Then
+        Assert.assertNull(myMap.remove(user1));
+    }
 }