diff --git a/13-design-patterns/snippets/design-patterns/behavioral/command/BuyStock.java b/13-design-patterns/snippets/design-patterns/behavioral/command/BuyStock.java
index 76712c61..ac3c1609 100644
--- a/13-design-patterns/snippets/design-patterns/behavioral/command/BuyStock.java
+++ b/13-design-patterns/snippets/design-patterns/behavioral/command/BuyStock.java
@@ -7,6 +7,7 @@ public BuyStock(Stock abcStock) {
         this.abcStock = abcStock;
     }
 
+    @Override
     public void execute() {
         abcStock.buy();
     }
diff --git a/13-design-patterns/snippets/design-patterns/behavioral/command/CommandPatternDemo.java b/13-design-patterns/snippets/design-patterns/behavioral/command/CommandPatternDemo.java
index ef9e3620..215d80a6 100644
--- a/13-design-patterns/snippets/design-patterns/behavioral/command/CommandPatternDemo.java
+++ b/13-design-patterns/snippets/design-patterns/behavioral/command/CommandPatternDemo.java
@@ -5,8 +5,8 @@ public class CommandPatternDemo {
     public static void main(String[] args) {
         Stock abcStock = new Stock();
 
-        BuyStock buyStockOrder = new BuyStock(abcStock);
-        SellStock sellStockOrder = new SellStock(abcStock);
+        Order buyStockOrder = new BuyStock(abcStock);
+        Order sellStockOrder = new SellStock(abcStock);
 
         Broker broker = new Broker();
         broker.takeOrder(buyStockOrder);
diff --git a/13-design-patterns/snippets/design-patterns/behavioral/command/SellStock.java b/13-design-patterns/snippets/design-patterns/behavioral/command/SellStock.java
index 278bdcda..16e372d2 100644
--- a/13-design-patterns/snippets/design-patterns/behavioral/command/SellStock.java
+++ b/13-design-patterns/snippets/design-patterns/behavioral/command/SellStock.java
@@ -7,6 +7,7 @@ public SellStock(Stock abcStock) {
         this.abcStock = abcStock;
     }
 
+    @Override
     public void execute() {
         abcStock.sell();
     }
diff --git a/13-design-patterns/snippets/design-patterns/behavioral/strategy/StrategyPatternDemo.java b/13-design-patterns/snippets/design-patterns/behavioral/strategy/StrategyPatternDemo.java
index fd9bdaf7..546ff7dd 100644
--- a/13-design-patterns/snippets/design-patterns/behavioral/strategy/StrategyPatternDemo.java
+++ b/13-design-patterns/snippets/design-patterns/behavioral/strategy/StrategyPatternDemo.java
@@ -15,7 +15,7 @@ public static void main(String[] args) {
         cart.pay(new PaypalStrategy("jeff.bezos@amazon.com", "mypwd"));
 
         // pay by credit card
-        cart.pay(new CreditCardStrategy("Jeff Bezos", "1234567890123456", "786", "12/22"));
+        cart.pay(new CreditCardStrategy("Jeff Bezos", "1234567890123456", "786", "12/24"));
     }
 
 }