Java接口中不可变Map的问答方法实现与优化

import java.util.HashMap;
import java.util.Map;
import java.util.Set; // 可能需要导入Set

public interface Chatty {

    // 聊天等级
    int LEVEL_MIN = 1;
    int LEVEL_MAX = 3;

    // 问答知识库，使用Map.of创建不可变Map
    Map<String,String> QA = Map.of(
            "Hello, how are you?", "I'm great, thanks.",
            "What are you?", "I am a chatbot",
            "Do you have a hobby?", "I like chatting with you.",
            "Can you tell a joke?", "You are very funny!",
            "What is the capital of UK?", "London",
            "Do you like Java?", "Yes of course.",
            "Are you a robot?", "Yes I’m a robot, but I’m a smart one!",
            "Do you get smarter?", "I hope so."
    );

    /**
     * 获取所有可提问的问题集合
     *
     * @return 所有问题的Set集合
     */
    Set<String> getQuestions(); // 优化后的方法名

    /**
     * 根据给定问题生成答案
     *
     * @param question 用户提出的问题
     * @return 机器人的回答
     */
    String answer(String question);
}

@Override
public Set<String> getQuestions() {
    return QA.keySet();
}

@Override
public String answer(String question) {
    // 如果问题存在于QA中，则返回对应答案；否则返回默认回复
    return QA.getOrDefault(question, "I don't know how to answer that question.");
}

import java.util.Set; // 导入Set

public class ChatBot implements Chatty {

    @Override
    public Set<String> getQuestions() {
        // 返回Chatty接口中QA Map的所有键（问题）集合
        return QA.keySet();
    }

    @Override
    public String answer(String question) {
        // 从QA Map中查找问题的答案，如果不存在则返回默认回复
        return QA.getOrDefault(question, "I don't know how to answer that question.");
    }

    // 示例：可以添加其他ChatBot特有的逻辑或状态
    public void greet() {
        System.out.println("Hello! I am a simple chatbot. Ask me something!");
    }

    public static void main(String[] args) {
        ChatBot myBot = new ChatBot();
        myBot.greet();

        System.out.println("\nAvailable questions:");
        for (String q : myBot.getQuestions()) {
            System.out.println("- " + q);
        }

        System.out.println("\n--- Chat Session ---");
        String userQuestion1 = "What are you?";
        System.out.println("User: " + userQuestion1);
        System.out.println("Bot: " + myBot.answer(userQuestion1));

        String userQuestion2 = "Do you like Java?";
        System.out.println("User: " + userQuestion2);
        System.out.println("Bot: " + myBot.answer(userQuestion2));

        String userQuestion3 = "What is your favorite color?"; // 未知问题
        System.out.println("User: " + userQuestion3);
        System.out.println("Bot: " + myBot.answer(userQuestion3));
    }
}