设计模式之命令模式

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1类图

2java示例

public class Test {public static void main(String[] args) {Seller riceSeller=new RiceSeller();Seller meatSeller=new MeatSeller();OrderMenuItem riceOrder=new OrderRice();OrderMenuItem meatOrder=new OrderMeat();riceOrder.setSeller(riceSeller);meatOrder.setSeller(meatSeller);Waiter waiter=new Waiter();waiter.setOrder(riceOrder);waiter.Order();waiter.setOrder(meatOrder);waiter.Order();}}

public class Waiter {private OrderMenuItem order;public void setOrder(OrderMenuItem order) {this.order = order;}public void Order(){this.order.order();}}

public interface Seller {void sell();}

public class MeatSeller implements Seller {@Overridepublic void sell() {System.out.println("sell meat");}}

public class RiceSeller implements Seller {@Overridepublic void sell() {System.out.println("sell rice");}}

public abstract class OrderMenuItem {protected Seller seller;public void setSeller(Seller seller) {this.seller = seller;}public abstract void order();}

public class OrderMeat extends OrderMenuItem {@Overridepublic void order() {this.seller.sell();}}

public class OrderRice extends OrderMenuItem {@Overridepublic void order() {this.seller.sell();}}

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