我是否在我的dart代码中正确使用了策略模式？

abstract class Strategy {
  void execute();
}

class ConcreteStrategyA implements Strategy {
  @override
  void execute() {
    // 实现具体的算法A
  }
}

class ConcreteStrategyB implements Strategy {
  @override
  void execute() {
    // 实现具体的算法B
  }
}

class Context {
  Strategy _strategy;

  Context(this._strategy);

  void executeStrategy() {
    _strategy.execute();
  }
}

void main() {
  // 创建具体的策略对象
  Strategy strategyA = ConcreteStrategyA();
  Strategy strategyB = ConcreteStrategyB();

  // 创建上下文对象，并设置具体的策略
  Context context = Context(strategyA);

  // 执行策略
  context.executeStrategy();

  // 切换策略
  context = Context(strategyB);
  context.executeStrategy();
}