update,

_resources/it114105/itp3914/Lab12/Ex1/Invoice.java

@@ -0,0 +1,42 @@
+public class Invoice {
+	private String invNumber;
+	private Item [] itemList;
+	private int itemCount;
+	
+	public Invoice(String invNumber, int itemNum) {
+		// 1. Set instance variable invNumber
+		// 2. Create an array of Item with number of elements specified 
+		//    by parameter itemNum. Refer to Topic 4.6, Slide 9
+		// 3. Set itemCount to 0, as there is no Item initially.
+		this.invNumber = invNumber;
+        itemList = new Item[itemNum];
+        itemCount = 0;
+	}
+ 
+	public String getInvNumber() {
+		return invNumber;
+	}
+ 
+	public Item[] getItemList() {
+		return itemList;
+	}
+	
+	public int getItemCount() {
+		return itemCount;
+	}
+ 
+	public Item getItem(int index) {
+		return itemList[index];
+	}
+ 
+	public void addItem(String productCode, double price, int quantity) {
+		if (itemCount < itemList.length) {
+			// create a new Item; Refer to Topic 4.6, Slide 9
+			// save item to appropriate element in itemList
+			itemList[itemCount] = new Item(productCode, price, quantity);
+			itemCount++;
+		} else {
+			System.out.println("Failed to add new item; max already");
+		}
+	}
+}