Javaデザインパターン・コマンドパターンの実践

// 命令接口
interface Command {
    void execute();
}

// 具体命令：开电视
class TurnOnCommand implements Command {
    private Television television;

    public TurnOnCommand(Television television) {
        this.television = television;
    }

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

// 具体命令：关电视
class TurnOffCommand implements Command {
    private Television television;

    public TurnOffCommand(Television television) {
        this.television = television;
    }

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

// 调用者：遥控器
class RemoteControl {
    private List<Command> commands;

    public RemoteControl() {
        commands = new ArrayList<>();
    }

    public void addCommand(Command command) {
        commands.add(command);
    }

    public void pressButton() {
        for (Command command : commands) {
            command.execute();
        }
    }
}

// 接收者：电视
class Television {
    public void turnOn() {
        System.out.println("电视已打开");
    }

    public void turnOff() {
        System.out.println("电视已关闭");
    }
}

// 主方法
public class Main {
    public static void main(String[] args) {
        // 创建电视
        Television television = new Television();

        // 创建命令
        Command turnOnCommand = new TurnOnCommand(television);
        Command turnOffCommand = new TurnOffCommand(television);

        // 创建遥控器并添加命令
        RemoteControl remoteControl = new RemoteControl();
        remoteControl.addCommand(turnOnCommand);
        remoteControl.addCommand(turnOffCommand);

        // 按下遥控器的按钮
        remoteControl.pressButton();
    }
}