命令模式

命令模式：将一个请求封装为一个对象，从而使你可用不同的请求对客户进行参数化；对请求排队或记录请求日志，以及支持可撤消的操作。

//命令接受者

public class Receiver {

public void Action(){

System.out.println("烧茄子");

}

}

 

//命令抽象类  

public abstract class Command {

protected Receiver receiver;

public Command(Receiver receiver){

this.receiver = receiver; }

public abstract void Execute(); }

 

//命令实现类 

public class ConcreateCommand extends Command{

public ConcreateCommand(Receiver receiver) {

super(receiver);

}

public void Execute() {

receiver.Action();

}

}

//调用者类 

public class Invoker {

private Command command;

public void SetCommand(Command command){

this.command = command;

}

public void ExecuteCommand(){

command.Execute();

}

}

 

//测试类

public class Test {  

public static void main(String[] args) {

Receiver receiver = new Receiver(); //创建接受者

Command command = new ConcreateCommand(receiver); //创建命令

Invoker invoker = new Invoker(); //创建执行者

//设置并执行命令

invoker.SetCommand(command);

invoker.ExecuteCommand(); } }