设计模式之命令模式

 

 

public class CommandTest1{public static void main(String[] args){Barbecuer boy = new Barbecuer();boy.BakeMutton();boy.BakeMutton();boy.BakeMutton();boy.BakeMutton();boy.BakeChickenWing();boy.BakeMutton();boy.BakeChickenWing();}}class Barbecuer{public void BakeMutton(){System.out.println("考羊肉串!");}public void BakeChickenWing(){System.out.println("考鸡翅膀!");}} 

 

 

public class CommandTest2{public static void main(String[] args){Barbecuer boy = new Barbecuer();Command bakeMutonCommand1 = new BakeMuttonCommand(boy);Command bakeMutonCommand2 = new BakeMuttonCommand(boy);Command bakeChickenWingCommand1 = new BakeChickenWingCommand(boy);Waiter girl = new Waiter();girl.SetOrder(bakeMutonCommand1);girl.Notify();girl.SetOrder(bakeMutonCommand2);girl.Notify();girl.SetOrder(bakeChickenWingCommand1);girl.Notify();System.out.println();}}abstract class Command{protected Barbecuer receiver;public Command(Barbecuer receiver){this.receiver = receiver;}abstract public void ExcuteCommand();}class BakeMuttonCommand extends Command{public BakeMuttonCommand(Barbecuer receiver){super(receiver);}public void ExcuteCommand(){receiver.BakeMutton();}}class BakeChickenWingCommand extends Command{public BakeChickenWingCommand(Barbecuer receiver){super(receiver);}public void ExcuteCommand(){receiver.BakeChickenWing();}}class Waiter{private Command command;public void SetOrder(Command command){this.command = command;//System.out.println(command.toString());}public void Notify(){command.ExcuteCommand();}} 

 

 

import java.util.*;public class CommandTest3{public static void main(String[] args){Barbecuer boy = new Barbecuer();Command bakeMutonCommand1 = new BakeMuttonCommand(boy);Command bakeMutonCommand2 = new BakeMuttonCommand(boy);Command bakeChickenWingCommand1 = new BakeChickenWingCommand(boy);Waiter girl = new Waiter();girl.SetOrder(bakeMutonCommand1);girl.SetOrder(bakeMutonCommand2);girl.SetOrder(bakeChickenWingCommand1);girl.Notify();System.out.println();}}class Waiter{private List<Command> orders = new ArrayList<Command>();public void SetOrder(Command command){if(command.toString() == "BakeChickenWingCommand"){System.out.println("服务于：鸡翅没有了，请点别的烧烤");}else{orders.add(command);System.out.println("增加订单："+command.toString()+" 时间："+(new Date()).toString());}}public void CancelOrder(Command command){orders.remove(command);System.out.println("取消订单："+command.toString()+" 时间："+(new Date()).toString());}public void Notify(){for(Command cmd : orders){cmd.ExcuteCommand();}}} 

 

 

public class CommandTest4{public static void main(String[] args){Receiver r = new Receiver();Command c = new ConcreteCommand(r);Invoker i = new Invoker();i.SetCommand(c);i.ExecuteCommand();System.out.println();}}abstract class Command{protected Receiver receiver;public Command(Receiver receiver){this.receiver = receiver;}abstract public void Execute();}class ConcreteCommand extends Command{public ConcreteCommand(Receiver receiver){super(receiver);}public void Execute(){receiver.Action();}}class Invoker{private Command command;public void SetCommand(Command command){this.command = command;}public void ExecuteCommand(){command.Execute();}}class Receiver{public void Action(){System.out.println("执行");}}