CECS 277
LAB ASSIGNMENT 7
Assigned date:4/29
Due date: 5/6
30 points

1. Visitor pattern
Design a ordering system application.

The customer can order the following items:

• laptop computers
  20% discount if the labtop is the Microsoft Surface
• Mobil phones
  Apple phone
  Apply $30 discount If the price is greater than $400.00
  Samsung phone
  Apply 20% discount if the phone is Galaxy S8
• Video game
  Sony-Playstation - 20% discount
  30% discount for buying two Microsoft Xbox One consoles.

Write a main method that accepts the customer orders, displays the orders and the total cost of all the orders.

2. Command pattern
//class Stock

public class Stock {

    private String name;
    private double price;

    public Product(String name, double price) {
        this.name = name;
        this.price = price;
    }

    public void buy(int quantity){
        System.out.println(“BOUGHT: “ + quantity + “x “ + this);
    }

    public void sell(int quantity){
        System.out.println(“SOLD: “ + quantity + “x “ + this);
    }

    public String toString() {
        return “Product [name=” + name + “, price=” + price + “]”;
    }

}

a. Create two command classes that allows the customer to buy and sold stocks.
b. Write a main method to test it.

3. Memento pattern

Design a simple calculator that allows to restores the previous additon operation of two numbers.