Feat: adds amiyah jones' lesson 14 exception system

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/Lesson14.java

@@ -3,6 +3,6 @@
 public class Lesson14 {
 
   public static void main(String[] args) {
-    System.out.println("Hello World");
+    System.out.println("Hello world");
   }
 }

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/ecommerce/EcommerceSystem.java

@@ -17,8 +17,11 @@ public void addProduct(String productId, String name) {
     products.put(productId, new Product(productId, name));
   }
 
-  public String placeOrder(String productId, int quantity) {
+  public String placeOrder(String productId, int quantity) throws ProductNotFoundException {
     Product product = products.get(productId);
+    if (product == null) {
+      throw new ProductNotFoundException("Product with ID " + productId + " not found");
+    }
     String orderId = UUID.randomUUID().toString();
     orders.put(orderId, new Order(orderId, product, quantity));
     return orderId;
@@ -28,8 +31,11 @@ public void cancelOrder(String orderId) {
     orders.remove(orderId);
   }
 
-  public String checkOrderStatus(String orderId) {
+  public String checkOrderStatus(String orderId) throws OrderNotFoundException {
     Order order = orders.get(orderId);
+    if (order == null) {
+      throw new OrderNotFoundException("Order with ID " + orderId + " not found");
+    }
     return "Order ID: "
         + orderId
         + ", Product: "

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/ecommerce/OrderNotFoundException.java

@@ -5,4 +5,8 @@
 
 package com.codedifferently.lesson14.ecommerce;
 
-class OrderNotFoundException {}
+class OrderNotFoundException extends Exception {
+  public OrderNotFoundException(String message) {
+    super(message);
+  }
+}

lesson_14/exceptions/exceptions_app/src/main/java/com/codedifferently/lesson14/ecommerce/ProductNotFoundException.java

@@ -5,4 +5,8 @@
 
 package com.codedifferently.lesson14.ecommerce;
 
-class ProductNotFoundException {}
+class ProductNotFoundException extends Exception {
+  public ProductNotFoundException(String message) {
+    super(message);
+  }
+}