Java Chatbot开发：基于接口实现问答逻辑与不可变数据访问

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

public interface Chatty {

    // Chat levels
    int LEVEL_MIN = 1;
    int LEVEL_MAX = 3;

    // Question & answer repertoires (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."
    );

    /**
     * Ask a question
     *
     * @return the question
     */
    String question();

    /**
     * Answer a given question by a given robot
     *
     * @param question A given question
     * @return An answer
     */
    String answer(String question);
}

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Set; // 确保导入

public class ChatBot implements Chatty {
    private final Random random = new Random();
    private final List<String> availableQuestions; // 缓存问题列表以供随机访问

    public ChatBot() {
        // 在构造函数中初始化问题列表，方便随机选取
        this.availableQuestions = new ArrayList<>(QA.keySet());
    }

    @Override
    public String question() {
        if (availableQuestions.isEmpty()) {
            return "I don't have any questions right now."; // 处理没有问题的情况
        }
        // 从可用问题列表中随机选择一个问题
        return availableQuestions.get(random.nextInt(availableQuestions.size()));
    }

    // ... answer() 方法将在下一节实现
}

// ... ChatBot 类的其他部分

    @Override
    public String answer(String question) {
        // 使用 getOrDefault() 方法，如果问题不存在，则返回一个默认的回复
        return QA.getOrDefault(question, "I don't know how to answer that question.");
    }
}

import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Set; // 确保导入

public class ChatBot implements Chatty {
    private final Random random = new Random();
    private final List<String> availableQuestions;

    public ChatBot() {
        this.availableQuestions = new ArrayList<>(QA.keySet());
    }

    @Override
    public String question() {
        if (availableQuestions.isEmpty()) {
            return "I don't have any questions right now.";
        }
        return availableQuestions.get(random.nextInt(availableQuestions.size()));
    }

    @Override
    public String answer(String question) {
        return QA.getOrDefault(question, "I don't know how to answer that question.");
    }

    public static void main(String[] args) {
        ChatBot bot = new ChatBot();
        System.out.println("Bot asks: " + bot.question()); // Bot随机提问
        System.out.println("User asks: Hello, how are you?");
        System.out.println("Bot answers: " + bot.answer("Hello, how are you?")); // 回答已知问题

        System.out.println("User asks: What is your favorite color?");
        System.out.println("Bot answers: " + bot.answer("What is your favorite color?")); // 回答未知问题
    }
}

import java.util.Map;
import java.util.Set; // 确保导入 Set

public interface ChattyOptimized { // 可以考虑直接修改原Chatty接口
    int LEVEL_MIN = 1;
    int LEVEL_MAX = 3;

    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."
    );

    /**
     * Get all available questions
     *
     * @return a Set of all questions
     */
    Set<String> getQuestions();

    /**
     * Get an answer for a given question
     *
     * @param question A given question
     * @return An answer, or a default message if question is not found
     */
    String getAnswer(String question);
}

import java.util.Set;

public class ChatBotOptimized implements ChattyOptimized {

    @Override
    public Set<String> getQuestions() {
        // 直接返回不可变Map的键集，这是一个Set视图
        return QA.keySet();
    }

    @Override
    public String getAnswer(String question) {
        // 同样利用 getOrDefault 处理未知问题
        return QA.getOrDefault(question, "I