command模式学习笔记

class Receiver {

	public void action() {
		System.out.println("receiver do the action");
	}
}

interface Command {
	public void excecute();
}

class ConcreteCommand implements Command {

	Receiver receiver;

	ConcreteCommand(Receiver receiver) {
		this.receiver = receiver;
	}

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

}

class Invoker {

	private Command command;

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

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

public class Client {

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