设计模式之命令模式，command

Command定义： 将来自客户端的请求传入一个对象，无需了解这个请求激活的动作或有关接受这个请求的处理细节。
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package liu.command.demo;

public abstract class Command {

 Barbecuer receiver;
 
 public Command(Barbecuer receiver){
  this.receiver = receiver;
 }
 abstract public void ExecuteCommand();
}

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package liu.command.demo;

public class BakeMuttonCommand extends Command {

 public BakeMuttonCommand(Barbecuer receiver) {
  super(receiver);
  
 }

 @Override
 public void ExecuteCommand() {
  receiver.BakeMutton();

 }

}

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package liu.command.demo;

public class BakeChickenWingCommand extends Command {

 public BakeChickenWingCommand(Barbecuer receiver) {
  super(receiver);
  
 }

 

 @Override
 public void ExecuteCommand() {
  receiver.BakeChickenWing();

 }

}

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package liu.command.demo;

public class Barbecuer {

 public void BakeMutton(){
  System.out.println("烤羊肉串");
 }
 
 public void BakeChickenWing(){
  System.out.println("烤鸡翅");
 }
}

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package liu.command.demo;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class Waiter {

 private List<Command> orders = new ArrayList<Command>();
 
 public void setOrder(Command command){
  if(command.getClass().equals(BakeChickenWingCommand.class)){
   System.out.println("服务员：鸡翅没有了，请点别的");
  }
  else{
   orders.add(command);
   Date d = new Date();
   
   System.out.println("增加订单"+command.toString()+"；时间："+d.toString());
  }
 }
 
 public void CancelOrder(Command command){
  orders.remove(command);
  Date d = new Date();
  System.out.println("取消订单"+command.toString()+"；时间："+d.toString());
 }
 
 public void Notify(){
  for(Command c:orders){
   c.ExecuteCommand();
  }
 }
}

 ----------------------------------------

 package liu.command.demo;

public class Main {

 /**
  * 命令模式
  */
 public static void main(String[] args) {
  Barbecuer boy = new Barbecuer();
  
  Command bakeMuttonCommand1 = new BakeMuttonCommand(boy);
  Command bakeMuttonCommand2 = new BakeMuttonCommand(boy);
  Command bakeChickenWingCommand = new BakeChickenWingCommand(boy);
  
  Waiter waiter = new Waiter();
  waiter.setOrder(bakeMuttonCommand1);
  waiter.setOrder(bakeMuttonCommand2);
  waiter.setOrder(bakeChickenWingCommand);
  waiter.Notify();

 }

}