java实战之猜字小游戏

一、题目描述

二、思路

语法基础：StringBuilder 类似列表，可以更改元素。

package Practice;

public class tt {
   public static void main(String[] args) {
       String str = "banana";
       System.out.println(str.indexOf('z')); // -1
       System.out.println(str.indexOf('a', 2)); // 3

StringBuilder words = new StringBuilder();
       for (int i = 0; i < 5; i++)
           words.append('*'); // "*****"
       System.out.println(words.length()); // 5
       System.out.println(words.indexOf("a"));// -1
       System.out.println(words.indexOf("*", 1)); // 1
       words.setCharAt(3, 'a'); // "***a*"
       System.out.println(words);
   }
}

三、代码

package Practice;

import java.util.Scanner;

public class Guess {
   public static String words[] = {"banana", "telecommunication", "programming", "bupt"};
   public static boolean[] guessed = new boolean[words.length]; // 判断猜过
   public static int num_guessed = 0; // 猜过的单词数量
   public static char keep; // 是否继续y or n

public static void main(String[] args) {
//        for(int i = 0; i < guessed.length; i ++ ) System.out.println(guessed[i]);
       Scanner scanner = new Scanner(System.in);

do{
           // 随机产生要猜测的单词  ans
           int index = (int) (Math.random() * words.length);
           String ans = words[index];
           // 再来一次时的重复检测
           while(guessed[index] == true)
           {
               index = (int) (Math.random() * words.length);
               ans = words[index];
           }

// 初始化，StringBuilder类似list
           StringBuilder guessedWord = new StringBuilder();
           for (int i = 0; i < ans.length(); i++)
               guessedWord.append('*');

int numberOfCorrectLettersGuessed = 0, numberOfMisses = 0;

// 模拟过程
           while (numberOfCorrectLettersGuessed < ans.length()) {
               System.out.print("(Guess) Enter a letter in word " + guessedWord
                       + " > ");
               String s = scanner.nextLine();
               char letter = s.charAt(0);

if (guessedWord.indexOf(letter + "") >= 0) { // 猜中，但重复，不算错误次数
                   System.out.println("\t" + letter + " is already in the word");
               } else if (ans.indexOf(letter) < 0) { // 猜错
                   System.out.println("\t" + letter + " is not in the word");
                   numberOfMisses++;
               } else { // 猜中，进行标记与赋值
                   int k = ans.indexOf(letter);
                   while (k >= 0) {
                       guessedWord.setCharAt(k, letter);
                       numberOfCorrectLettersGuessed++;
                       k = ans.indexOf(letter, k + 1);
                   }
               }
           }

System.out.println("The word is " + ans + ". You missed "
                   + numberOfMisses + ((numberOfMisses <= 1) ? " time" : " times"));

guessed[index] = true;
           num_guessed += 1;

if(num_guessed < words.length)
           {
               System.out.print("Do you want to guess for another word? Enter y or n> ");
               keep = scanner.nextLine().charAt(0);
           }

}while(keep == 'y' && num_guessed < words.length);

if(keep == 'y')
           System.out.println("Perfect!!!");
       else
           System.out.println("You have guessed " + num_guessed + ((num_guessed <= 1) ? " word~" : " words~"));

}
}

四、效果图

全部猜完

中途退出

来源：https://blog.csdn.net/whq___/article/details/115861711