原文： https://howtodoinjava.com/puzzles/hilo-guessing-game-in-java/

你们中的许多人在您的童年时代一定玩过 HiLo 游戏。 即使不完全相同，游戏也可能与此类似。 很好玩吧？ 那如果我们现在成年了怎么办？ 让我们以自己的方式再次玩这个游戏。 让我们为此构建一个 Java 程序，然后开始玩这个精彩的游戏 HiLo。

用 Java 编写 HiLo 游戏

在下面的程序中，我尝试用 Java 语言模拟 HiLo 游戏。 我为此版本的游戏设定了两个简单的规则：

  1. 最多猜 6 次密码。
  2. 密码是 1 到 100（含）之间的整数。

每次您猜到一个低于密码的数字（只有 JRE 知道）时，都会打印“LO”。 同样，如果您猜到一个比密码高的数字，则会打印“HI”。 您必须调整下一个猜测，以便能够在六次尝试中猜测正确的数字。

  1. package hilo;
  3. import java.io.BufferedReader;
  4. import java.io.IOException;
  5. import java.io.InputStreamReader;
  6. import java.util.Random;
  8. public class HiLo {
  10.     private Random generator;
  11.     private int generatedNumber;
  12.     private int numberOfAttempts;
  13.     BufferedReader reader = null;
  15.     public HiLo() {
  16.         generator = new Random();
  17.         reader = new BufferedReader(new InputStreamReader(System.in));
  18.     }
  20.     public void start() throws IOException {
  22.         boolean wantToPlay = false;
  23.         boolean firstTime = true;
  25.         do {
  26.             System.out.println();
  27.             System.out.println();
  28.             System.out.println("Want to play the game of Hi and Lo??");
  29.             if (wantToPlay = prompt()) {
  30.                 generatedNumber = generateSecretNumber();
  31.                 numberOfAttempts = 0;
  32.                 if (firstTime) {
  33.                     describeRules();
  34.                     firstTime = false;
  35.                 }
  36.                 playGame();
  37.             }
  39.         } while (wantToPlay);
  41.         System.out.println();
  42.         System.out.println("Thanks for playing the game. Hope you loved it !!");
  43.         reader.close();
  44.     }
  46.     private void describeRules() {
  47.         System.out.println();
  48.         System.out.println("Only 2 Rules:");
  49.         System.out.println("1) Guess the secret number in maximum 6 tries.");
  50.         System.out.println("2) The secret number is an integer between 1 and 100, inclusive :-)");
  51.         System.out.println();
  52.         System.out.println();
  53.     }
  55.     private int generateSecretNumber() {
  56.         return (generator.nextInt(100) + 1);
  57.     }
  59.     private void playGame() throws IOException {
  61.         while (numberOfAttempts < 6) {
  63.             int guess = getNextGuess();
  65.             if (guess > generatedNumber) {
  66.                 System.out.println("HI");
  67.             } else if (guess < generatedNumber) {
  68.                 System.out.println("LO");
  69.             } else {
  70.                 System.out.println("Brave Soul, You guessed the right number!! Congratulations !!");
  71.                 return;
  72.             }
  73.             numberOfAttempts++;
  74.         }
  76.         System.out.println("Sorry, you didn't guess the right number in six attempts. In other two words, YOU LOST !!!!");
  77.         System.out.println("The secret number was " + generatedNumber);
  79.     }
  81.     private boolean prompt() {
  83.         boolean answer = false;
  85.         try {
  87.             boolean inputOk = false;
  88.             while (!inputOk) {
  89.                 System.out.print("Y / N : ");
  90.                 String input = reader.readLine();
  91.                 if (input.equalsIgnoreCase("y")) {
  92.                     inputOk = true;
  93.                     answer = true;
  94.                 } else if (input.equalsIgnoreCase("n")) {
  95.                     inputOk = true;
  96.                     answer = false;
  97.                 } else {
  98.                     System.out.println("Ohh come on. Even Mr. Bean knows where are 'y' and 'n' in the keyboard?? Please try again:");
  99.                 }
  100.             }
  102.         } catch (IOException e) {
  103.             e.printStackTrace();
  104.             System.exit(-1);
  105.         }
  107.         return answer;
  108.     }
  110.     private int getNextGuess() throws IOException {
  112.         boolean inputOk = false;
  113.         int number = 0;
  114.         String input = null;
  115.         while (!inputOk) {
  116.             try {
  118.                 System.out.print("Please guess the secret number: ");
  119.                 input = reader.readLine();
  120.                 number = Integer.parseInt(input);
  121.                 if (number >= 1 && number <= 100) {
  122.                     inputOk = true;
  123.                 } else {
  124.                     System.out.println("Really? You didn't read the rules boy. Your number is not between 1 and 100 (" + number + ").");
  125.                 }
  126.             } catch (NumberFormatException e) {
  127.                 System.out.println("Invalid input (" + input + ")");
  128.             }
  129.         }
  131.         return number;
  132.     }
  133. }

玩 HiLo 游戏

现在，游戏已准备就绪。 播放吧。

  1. package hilo;
  3. import java.io.IOException;
  5. public class PlayGame
  6. {
  7.    public static void main(String[] args)
  8.    {
  9.       HiLo hiLo = new HiLo();
  10.       try {
  11.           hiLo.start();
  12.       } catch (IOException e) {
  13.          e.printStackTrace();
  14.       }
  15.    }
  16. }
  18. Output:
  20. Want to play the game of Hi and Lo??
  21. Y / N : y
  23. Only 2 Rules:
  24. 1) Guess the secret number in maximum 6 tries.
  25. 2) The secret number is an integer between 1 and 100, inclusive.
  27. Please guess the secret number: 40
  28. LO
  29. Please guess the secret number: 60
  30. LO
  31. Please guess the secret number: 80
  32. HI
  33. Please guess the secret number: 70
  34. LO
  35. Please guess the secret number: 75
  36. LO
  37. Please guess the secret number: 77
  38. HI
  39. Sorry, you didn't guess the right number in six attempts. In other two words, YOU LOST !!!!
  40. The secret number was 76

希望您喜欢这个游戏。

祝您学习愉快！