Command

public interface Command {

public void excute();

}

public class Light {

public void on() {

System.out.println("return on");

}

public void off() {

System.out.println("return off");

}

}

public class LightOnCommand implements Command{

private Light light;

public LightOnCommand(Light light) {

this.light = light;

}

@Override

public void excute() {

light.on();

}

}

public class SampleRemoteControl {

private Command command;

public void setComand(Command command) {

this.command = command;

}

public void buttonWarPressed() {

command.excute();

}

}

public class Test {

public static void main(String[] args) {

Light light = new Light();

Command command = new LightOnCommand(light);

SampleRemoteControl control = new SampleRemoteControl();

control.setComand(command);

control.buttonWarPressed();

}

}