命令模式

命令接口
命令具体类
命令接收者
命令发送者

public interface Command {
    void turnOff();
    void turnOn();

}

public class TurnOnCommand implements Command {
    Light light;

    public TurnOnCommand(Light light) {
        this.light = light;
    }


    @Override
    public void turnOff() {
        light.turnOff();
    }

    @Override
    public void turnOn() {
        light.turnOn();
    }
}

public class Light {
    public void turnOn(){
        System.out.println("开灯");
    }
    public void turnOff(){
        System.out.println("关灯");
    }
}

public class Actor {
    Command command;

    public Actor(Command command) {
        this.command = command;
    }
    public void executeTurnOn(){
        command.turnOn();
    }
    public void executeTurnOff(){
        command.turnOff();
    }
}

测试

public class Test {
    public static void main(String[] args) {
        Actor actor = new Actor(new TurnOnCommand(new Light()));
        actor.executeTurnOn();
        actor.executeTurnOff();
    }
}