Add TT7.java

Author: seanprashad

Miscellaneous/TT7.java

@@ -0,0 +1,89 @@
+import java.util.*;
+
+interface ShoppingCart {
+    void addItem(String itemType, int number);
+
+    void printReceipt();
+}
+
+class TT7 implements ShoppingCart {
+
+    private class Item {
+        private String name;
+        private double price;
+
+        public Item(String n, double p) {
+            name = n;
+            price = p;
+        }
+    }
+
+    private class LineItem {
+        private Item item;
+        private int quantity;
+
+        public LineItem(Item i, int q) {
+            item = i;
+            quantity = q;
+        }
+
+        public double getPrice() {
+            return item.price;
+        }
+
+        public int getQuantity() {
+            return quantity;
+        }
+
+        public String toString() {
+            return String.format("%-20s$%-19.2f%-20s$%.2f", item.name, item.price, quantity, item.price * quantity);
+        }
+    }
+
+    private List<LineItem> lineItems;
+    private Map<String, Double> itemPrices;
+    private double grandTotal;
+
+    public TT7() {
+        grandTotal = 0.0;
+        lineItems = new ArrayList<>();
+        itemPrices = new HashMap<>();
+
+        itemPrices.put("Apple", 0.30);
+        itemPrices.put("Pear", 1.20);
+    }
+
+    public void addItem(String itemType, int number) {
+        double itemPrice = itemPrices.getOrDefault(itemType, 0.0);
+        lineItems.add(new LineItem(new Item(itemType, itemPrice), number));
+    }
+
+    public void printReceipt() {
+        printReceiptHeader();
+
+        for (LineItem li : lineItems) {
+            System.out.println(li);
+            grandTotal += (li.getPrice() * li.getQuantity());
+        }
+
+        printGrandTotal(grandTotal);
+    }
+
+    private void printReceiptHeader() {
+        System.out.printf("%-20s%-20s%-20s%-20s\n", "Item", "Unit price", "Quantity", "Total");
+    }
+
+    private void printGrandTotal(double grandTotal) {
+        System.out.printf("\n%-60s$%-20.2f\n", "Total:", grandTotal);
+    }
+
+    public static void main(String[] args) {
+        TT7 tt7 = new TT7();
+
+        tt7.addItem("Pear", 2);
+        tt7.addItem("Apple", 3);
+
+        tt7.printReceipt();
+        return;
+    }
+}