java学习笔记-设计模式19(命令模式)

意图

　　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，以及支持可取消的操作

public interface Command {
    public void exe();
}

public class MyCommand implements Command {  

    private Receiver receiver;  

    public MyCommand(Receiver receiver) {
        this.receiver = receiver;
    }  

    @Override
    public void exe() {
        receiver.action();
    }
}

public class Receiver {
    public void action(){
        System.out.println("command received!");
    }
}

public class Invoker {  

    private Command command;  

    public Invoker(Command command) {
        this.command = command;
    }  

    public void action(){
        command.exe();
    }
}

public class Test {  

    public static void main(String[] args) {
        Receiver receiver = new Receiver();
        Command cmd = new MyCommand(receiver);
        Invoker invoker = new Invoker(cmd);
        invoker.action();
    }
}

　　转自：http://blog.csdn.net/zhangerqing/article/details/8243942