题目描述：

编写一个猜字游戏。随机产生一个单词，提示用户一次猜测一个字母，如运行示例所示。单词中的每个字母显示为一个星号。当用户猜测正确后，正确的字母显示出来。当用户猜出一个单词，显示猜错的次数，并且询问用户是否继续对另外一个单词进行游戏。声明一个数组来存储单词，如下所示：

代码：

import java.util.Scanner;

public class Test25 {
          
   

	public static void main(String[] args) {
          
   
		Scanner in = new Scanner(System.in);
		
		String[] words = {
          
   "write","happy","sun","love","study","cat"};
		int[] words_guessed = new int[words.length];	//定义数组保存已经猜过的单词的下标
		
		for(int i =0; i < words.length; i++)			//初始化数组元素
			words_guessed[i] = words.length;
		
		for(int i =0; i < words.length; i++)
		{
          
   
			int r = getRandom(words.length,words_guessed);
			words_guessed[i] = r;
			guessGame(words[r]);
			
			System.out.print("Do you want to guess another word?Enter y or n:");
			
			while(true)
			{
          
   
				char option = new java.util.Scanner(System.in).next().charAt(0);
				if(option == n) 
				{
          
   
					in.close();
					return;
				}
				else if(option != y)
					System.out.println("Enter error!Re-enter:");
				else
					break;
			}
		}
		
		System.out.println("No more words");
		in.close();

	}
	
	//游戏主体
	public static void guessGame(String word) {
          
   
		String[] answer = new String[word.length()];
		int miss_count = 0;
		char your_answer;
		int flag;			//0:猜错  1:猜对  2:已经猜过
		
		for(int i = 0; i < answer.length; i++)
			answer[i] = "*";
		
		while(true)
		{
          
   
			flag = 0;
			System.out.print("(Guess) Enter a letter in word ");
			printArrays(answer);
			System.out.print(" > ");
			your_answer = new java.util.Scanner(System.in).next().charAt(0);
			for(int i = 0; i < word.length(); i++)
			{
          
   
				if(your_answer == word.charAt(i))
				{
          
   
					if(your_answer != answer[i].charAt(0)) 
					{
          
   
						answer[i] = String.valueOf(your_answer);
						flag = 1;
					}
					else
					{
          
   
						flag = 2;
						break;
					}
				}
			}
			if(overGuess(answer))
			{
          
   
				System.out.print("The word is ");
				printArrays(answer);
				System.out.println(". You missed "+miss_count+" time");
				return;
			}
			if(flag == 0) 
			{
          
   
				System.out.println(your_answer+" is not in the word");
				miss_count++;
			}
			else if(flag == 2)
			{
          
   
				System.out.println(your_answer+" is already in the word");
			}
		}
	}
	
	//随机数选择:返回[0，upper_bound)的随机整数,不包括numbers
	public static int getRandom(int upper_bound,int... numbers)
	{
          
   
		int random = (int)(Math.random() * upper_bound);
	    for (int i = 0;i < numbers.length;i++)
	    {
          
   
	    	if (random == numbers[i])
	    	{
          
   
	    		random = (int)(Math.random() * upper_bound);
	    		i = 0;
	    	}
	    }
	    return random;
	}
	
	//判断是否猜完
	public static boolean overGuess(String[] answer) {
          
   
		for(int i = 0; i < answer.length; i++)
		{
          
   
			if(answer[i].charAt(0) == *)
				return false;
		}
		return true;
	}
	
	//输入数组元素
	public static void printArrays(String[] array) {
          
   
		for(int i = 0; i < array.length; i++)
			System.out.print(array[i]);
	}
	
}

运行截图：