public static void main(String[] args) {
MediatorImpl mediator = new MediatorImpl();
System.out.println("-----------採購人員採購電腦-----------");
Purchase purchase = new Purchase(mediator);
purchase.buyIBMComputer(100);
System.out.println("-----------銷售人員銷售電腦-----------");
Sale sale = new Sale(mediator);
sale.sellIBMComputer(1);
System.out.println("-----------庫房管理人員清倉處理-----------");
Stock stock = new Stock(mediator);
stock.clearStock();
// 用一個中介物件封裝一系列的物件交互作用，中介者使各物件不需要直接的互動，從而使其偶和鬆散，而且可以獨立的改變他們之間的交互作用
// Define an object that encapsulates how a set of objects interact. Mediator promotes loose
// coupling by keeping objects from referring to each other explicitly. and it lets you vary
// their interaction independently.
}
private void sellComputer(int number) {
if (stock.getStockNumber() < number) {
purchase.buyIBMComputer(number);
}
stock.decrease(number);
}