如何为以下代码编写语音对象？

Question

到目前为止，我计划在城市公交车上模拟CAD系统。我处于它的开始阶段，这只是为了基本上创造声音。我此时没有创建语音对象的经验。我的问题是，我如何创建一个语音对象来读取以下消息？

import java.util.*;
import java.io.*;

public class message {
  public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    String message = "";
    System.out.print("Please enter a number between 1 through 5");
    int num = input.nextInt();
    if (num == 1)
      message = "Please do not use profanity on the bus";
    if (num == 2)
      message = "Help us get you there faster. If able, please use the rear exit";
    if (num == 3)
      message = "Please remember, seats are not for feet.";
    if (num == 4)
      message = "Thank you for using headphones, also please keep your cell phone conversations quiet.";
    if (num == 5)
      message = "Please do not speak with the driver while the bus is moving.";
    System.out.println(message);
  }
}

到目前为止，我把它设置为在LED显示屏上打印，我试图弄清楚如何将语音合并到这个系统中，以便在我选择一个消息时说出消息。任何帮助将不胜感激。