Add ShoppingCard

src/main/java/org/example/ShoppingCart.java

@@ -0,0 +1,28 @@
+package org.example;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+
+public class ShoppingCart {
+
+    HashMap<Product, Integer> products = new HashMap<>();
+
+    public void addProduct(Product product) {
+        int currentQuantity = products.getOrDefault(product, 0);
+        products.put(product, currentQuantity + 1);
+    }
+
+    public void removeProduct(Product product) {
+        int currentQuantity = products.getOrDefault(product, 0);
+        if (currentQuantity > 1) {
+            products.put(product, currentQuantity - 1);
+        } else {
+            products.remove(product);
+        }
+    }
+
+    public void clearProducts() {
+        products.clear();
+    }
+}