AIChatbot.java

import java.util.Scanner;

public class AIChatbot {

    static String getResponse(String msg) {

        switch (msg.toLowerCase().trim()) {

            case "hello":
            case "hi":
            case "hey":
                return "Hello! How are you?";

            case "how are you":
                return "I'm doing great! Thanks for asking.";

            case "what is your name":
                return "I'm a simple Java chatbot.";

            case "what can you do":
                return "I can respond to a few predefined messages.";

            case "thank you":
            case "thanks":
                return "You're welcome!";

            case "bye":
            case "exit":
                return "Goodbye! Have a great day.";

            default:
                return "Sorry, I don't understand that yet.";
        }
    }

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        System.out.println("========== JAVA CHATBOT ==========");
        System.out.println("Type 'bye' or 'exit' to end the chat.");

        while (true) {

            System.out.print("\nYou: ");
            String msg = sc.nextLine();

            String response = getResponse(msg);

            System.out.println("Bot: " + response);

            if (msg.equalsIgnoreCase("bye") ||
                msg.equalsIgnoreCase("exit")) {
                break;
            }
        }

        sc.close();
    }
}