#Feat - addProdukt, removeProduct implementiert

Shop/resources/quellen.txt

@@ -13,4 +13,9 @@ Code Gym - Get and Set
 https://codegym.cc/de/groups/posts/getter-und-setter-in-java
 
 Bro Code - How to read a File
-https://www.youtube.com/watch?v=eHjbvgw4hsI
+https://www.youtube.com/watch?v=eHjbvgw4hsI
+
+
+Baeldung - ConcurrentModificationException
+https://www.baeldung.com/java-concurrentmodificationexception
+

Shop/src/de/th_mannheim/informatik/main/java/shop/backend/Cart.java

@@ -1,8 +1,42 @@
 package shop.backend;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public class Cart {
 
+private List<CartPosition> positions;
 
+public Cart(){
+    this.positions = new ArrayList<>();
+
+}
+
+public void addProduct(Product prod, int quantity){
+    //Ich überprüfe damit ob es das Produkt gibt
+    for(CartPosition pos : positions){
+        //Ist es das Produkt? Hat es dieselbe ID? ---> Ja ---> Quantity erhöhen---->break
+        if(pos.getProduct().getProdID() == prod.getProdID()){
+            pos.setQuantity(pos.getQuantity() + quantity); //Damit erhöhe ich quantity
+            break;
+        }
+        positions.add(new CartPosition(prod, quantity));
+    }
+}
+public void removeProduct(int productID){
+    CartPosition gettinYETTED = null;
+    for(CartPosition pos : positions){
+
+        if(pos.getProduct().getProdID() == productID){
+            gettinYETTED = pos;
+            break; // Gefunden, abbrechnen
+        }
+    }
+    //
+    if(gettinYETTED != null){
+        positions.remove(gettinYETTED);
+    }
+}