说明：  猜单词游戏（Java）。游戏开始，随机从10个单词中选择一个作为被猜单词，游戏者输入一个字母，如果单词中出现此字母，则显示出所有出现的位置上的该字母。如果游戏者输入？，则随机显示出一种字母。直至单词被猜出。
(Guess the word game (Java). Beginning of the game, from 10 randomly selected a word as the word is guessed, players enter a letter, if the word appears in this letter, showing the location of all occurrences on the letter. If the player input? , Then shows a random letters. Until the word is guessed.)