/**
 * 出题策略工厂类，根据role返回对应策略
 */
public class QuestionStrategyFactory {
    public static QuestionStrategy getStrategy(String role) {
        switch (role) {
            case "小学":
                return new ElementaryQuestionStrategy();
            case "初中":
                return new MiddleSchoolQuestionStrategy();
            case "高中":
                return new HighSchoolQuestionStrategy();
            default:
                throw new IllegalArgumentException("未知的角色: " + role);
        }
    }
}