Question

我正在为我的作业编写一个刽子手程序，我遇到了一个小问题。在我的程序中，要分开单词，我使用'|'符号。例如，这是要猜的词：

U N I T E D | S T A T E S | O F | A M E R I C A

我有一个显示no的StringBuffer变量。破折号这里，

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

我尝试使用以下代码插入分隔符“|”

if(guessword.indexOf('|') == -1)
    System.out.print(" ");
else
    guessit.setCharAt(guessword.indexOf('|'),'|');

我知道它错了，它只插入一个分隔符。你能帮我把分离器插到正确的位置吗？你也可以尝试删除System.out.print（“”）;因为它不必要地留下空间。我可以使用休息;代替对于上面的例子，我将显示为

_ _ _ _ _ _ | _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

我其实想要

_ _ _ _ _ _ | _ _ _ _ _ _ | _ _ | _ _ _ _ _ _ _

我的主要方法如下

public static void main()throws IOException
{
    Hangman obj = new Hangman();
    InputStreamReader isr = new InputStreamReader(System.in);
    BufferedReader br = new BufferedReader(isr);
    PrintWriter p = new PrintWriter(System.out,true);

    p.println("Lets play HANGMAN");
    p.println();
    p.println("Enter your choice according to the following options.\n
               NOTE: Words are related to the topics given below.\n
               1. Sports\n2. Movies\n3. Computer\n4. Food\n5. Countries");
    p.println();
    int choice = Integer.parseInt(br.readLine());
    obj.clearScreen();
    String bothwordandclue[] = new String[2];

    if(choice == 1)
        bothwordandclue = obj.Sports();
    else if(choice == 2)
        bothwordandclue = obj.Movies();
    else if(choice == 3)
        bothwordandclue = obj.Computers();
    else if(choice == 4)
        bothwordandclue = obj.Food();
    else if(choice == 5)
        bothwordandclue = obj.Countries();
    else
        p.println("Wrong choice");

    int counter = 6;
    String guessword = bothwordandclue[0];
    String wordclue = bothwordandclue[1];

    int lengthofword = (int)(Math.round(((double)guessword.length()/2)));
    int checkguess = 0;
    String a;
    StringBuffer guessit = new StringBuffer();

    for (int i = 0;i < lengthofword; i++)
        guessit = guessit.append("_ ");

    guessit.delete((2 * lengthofword)-1,(2 * lengthofword));

    if(guessword.indexOf('|') == -1)
        System.out.print(" ");
    else
        guessit.setCharAt(guessword.indexOf('|'),'|');

    p.println(guessit);
    do
    {
        p.println();
        p.println("Enter your guess letter in capitals");
        String guessletter = br.readLine();
        obj.clearScreen();

        for(int i = 0;i<lengthofword;i++)
        {
            if(guessletter.charAt(0) == guessword.charAt(2*i))
            {
                guessit.setCharAt(2*i,guessletter.charAt(0));
                checkguess=1;
            }                
        }
        if(checkguess == 1)
        {
            p.println("Correct Guess");
            p.println(guessit);
        }
        else
        {
            counter--;
            p.println("Wrong guess. You have " + counter + 
                                    " incorrect guesses left");
            p.println(guessit);
        }
        checkguess = 0;
        a = guessit.toString();
        if(a.equals(guessword))
        {
            p.println("You guessed the word!!!!!");
            counter=0;
        }        
    }while(counter>0);
}

Answer 1

问题是setCharAt和indexOf仅适用于每个索引，这就是它只替换第一个索引的原因。您将不得不多次迭代guessword。您既可以使用Java的一些其他内置String函数，也可以使用简单的for循环，即

for(int i = 0; i < guessword.length(); i++){
    if(guessword.charAt(i) == '|')
        guessit.setCharAt(i, '|');
}

Answer 2

您只能使用indexOf执行此操作。只需要使用该方法的另一个版本，即从哪里开始搜索。请在此处查看您需要的String#indexOf(String str, int fromIndex)。

int index = guessword.indexOf("|");
while(index >= 0) {
   guessIt.setCharAt(index, '|')

   // Start searching for next "|" after this index
   index = guessword.indexOf("|", index+1));  
}

Answer 3

请参阅String.replaceAll

如果你不了解正则表达式：

Regular expression on wikipedia

Regular expression cheat sheet

如何在单词之间添加分隔符？

3 个答案: