public interface Command() {
	public void execute();
}

public class MyCommand implements Command {
	private Receiver receiver;

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

	@Override
	public void execute() {
		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.execute();
	}
}

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();
	}
}