Java:使用onComplete回调简单实现Command模式？

// Command接口
public interface Command {
    void execute();
    void setCallback(Callback callback);
}

// 具体的命令类
public class ConcreteCommand implements Command {
    private Callback callback;

    @Override
    public void execute() {
        // 执行具体的命令操作
        // ...
        
        // 执行完命令后调用回调
        if (callback != null) {
            callback.onComplete();
        }
    }

    @Override
    public void setCallback(Callback callback) {
        this.callback = callback;
    }
}

// 回调接口
public interface Callback {
    void onComplete();
}

// 使用示例
public class Main {
    public static void main(String[] args) {
        Command command = new ConcreteCommand();
        Callback callback = new Callback() {
            @Override
            public void onComplete() {
                System.out.println("Command执行完成后的回调操作");
            }
        };
        command.setCallback(callback);
        command.execute();
    }
}