Added methods to Item and Player, adjusted comments on Merchant:

*Added the increase and decreaseQuantity methods to the Item class and
added the buy method to the player class

MerchantRPGCSE2102/src/model/Item.java

@@ -50,6 +50,31 @@ else if(calculatedPrice < _minPrice)
 		return _adjustedPrice;
 	}
 
+	/**
+	 * This method increases the quantity of the items
+	 * 
+	 * @param amount is the amount that the item will be increased by
+	 */
+	public void increaseQuantity(int amount)
+	{
+		_quantity += amount;
+	}
+
+	/**
+	 * This method decreases the quantity of the items
+	 * 
+	 * @param amount is the amount that the item will be decreased by
+	 */
+	public void decreaseQuantity(int amount)
+	{
+		if(amount > getQuantity())
+		{
+			System.out.println("Player does not have sufficient amount of" + getItemName());
+		}
+		else
+			_quantity -= amount;
+	}
+
 	/**
 	 * Returns the item's name
 	 * 

MerchantRPGCSE2102/src/model/Merchant.java

@@ -104,7 +104,7 @@ public void setDailyRandomPercentage(int minPercent, int maxPercent)
 	}
 
 	/**
-	 * This method searches through the merchant's inventory for the specified item name and returns the corresponding item's price
+	 * This method searches through the merchant's inventory for the specified item name and returns the corresponding item's adjusted price
 	 * 
 	 * @param	itemName	string containing the name of the item to search for
 	 * @return				the price of the item

MerchantRPGCSE2102/src/model/Player.java

@@ -42,10 +42,23 @@ private void generatePlayerInventory(ArrayList<String> itemList)
 	 * 
 	 * @param itemName			string containing the name of the item to be purchased
 	 * @param targetMerchant	the merchant who the player is purchasing from
+	 * @param amount			the amount of the item that the player is buying
 	 */
-	public void buy(String itemName, Merchant targetMerchant)
+	public void buy(String itemName, Merchant targetMerchant, int amount)
 	{
+		int totalPrice = targetMerchant.getItemPrice(itemName)* amount; //calculates the total price of the items
 
+		if(totalPrice > getPlayerCash())
+		{
+			System.out.println("You do not have sufficent cash");		//will output error message if total price is over the player's cash amount
+			//will have to loop back out to Transaction class
+		}
+		else
+		{
+			deductCash(totalPrice);
+			Item targetItem = getItem(itemName);
+			targetItem.increaseQuantity(amount);
+		}
 	}
 
 	/**
@@ -58,6 +71,24 @@ public void sell(String itemName, Merchant targetMerchant)
 	{
 
 	}
+
+	/**
+	 * Searches through the player's inventory for the item corresponding to the specified item name
+	 * 
+	 * @param	itemName	string containing the name of the item
+	 * @return	the item matching the specified item name
+	 */
+	public Item getItem(String itemName)
+	{
+		for(int i = 0; i < _playerInventory.length; i++)
+		{
+			if(_playerInventory[i].getItemName().equals(itemName))
+				return _playerInventory[i];
+		}
+
+		System.out.println("No such item exists");	// item was not found by searching the inventory
+		return null;
+	}
 
 	/**
 	 * Decreases the player's cash by the specified amount