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Order.java

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+package com.ecommerce.orders;
+import com.ecommerce.*;
+import java.util.ArrayList;
+
+public class Order {
+    // id variable is the id
+    private int id;
+    // id counter used to make the id increases each time there is more customer had added
+    private static int idCounter = 0;
+    private Customer customer;
+    private double totalAmount;
+
+
+    public Order(Customer customer){
+        idCounter++;
+        this.customer = customer;
+        this.totalAmount = calcTotal(customer.getShoppingCart());
+        this.id = idCounter;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public Customer getCustomer() {
+        return customer;
+    }
+
+    public double getTotalAmount() {
+        return totalAmount;
+    }
+
+    // to calculate the total amount that the customer should pay
+    private double calcTotal(ArrayList<Product> products){
+        double totalAmount = 0;
+        for(Product i : products){
+            totalAmount = totalAmount + i.getPrice();
+        }
+        return totalAmount;
+    }
+
+}