From ba178e05fd342cae9519a469e26fdbaba8310572 Mon Sep 17 00:00:00 2001
From: Daniel Zikol <3020574@stud.hs-mannheim.de>
Date: Sat, 13 Dec 2025 17:19:05 +0100
Subject: [PATCH] #Feat - addProdukt, removeProduct implementiert

---
 Shop/resources/quellen.txt                    |  7 +++-
 .../main/java/shop/backend/Cart.java          | 34 +++++++++++++++++++
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/Shop/resources/quellen.txt b/Shop/resources/quellen.txt
index f612cc3..b7181b5 100644
--- a/Shop/resources/quellen.txt
+++ b/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
\ No newline at end of file
+https://www.youtube.com/watch?v=eHjbvgw4hsI
+
+
+Baeldung - ConcurrentModificationException
+https://www.baeldung.com/java-concurrentmodificationexception
+
diff --git a/Shop/src/de/th_mannheim/informatik/main/java/shop/backend/Cart.java b/Shop/src/de/th_mannheim/informatik/main/java/shop/backend/Cart.java
index af36137..f04bc7c 100644
--- a/Shop/src/de/th_mannheim/informatik/main/java/shop/backend/Cart.java
+++ b/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);
+    }
+}