first

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

     public long getId(){
         return this.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);
+    }
 }

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

 
     @Override
     public int size() {
-        return -1;
+        return entries.size();
     }
 
     @Override
     public boolean isEmptry() {
-        return false;
+        return entries.size()==0;
     }
 
     @Override
     public Cart get(User key) {
         // find the cart associate with the key
+        for(int i=0; i<entries.size(); i++){
+
+        }
         return null;
     }
 

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

     public void setName(String name) {
         this.name = name;
     }
+
+
+    public boolean equals(Object obj) {
+        boolean same = false;
+        User user = (User) obj;
+        if(user.getName()== null){
+            if(user.getId() == this.id){
+                same = true;
+            }
+        }else if((user.getId() == this.id) && (user.getName().equalsIgnoreCase(this.name))){
+            same = true;
+        }
+        return same;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(id, name);
+    }
 }