cart done

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

@@ -12,4 +12,19 @@ public class Cart {
     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/User.java

@@ -50,4 +50,8 @@ public class User {
         }
         return false;
     }
+
+    public int hashCode(){
+        return Objects.hash(this.getId(), this.getName());
+    }
 }