用不同的字符替換字符串中的所有字符

Question

你好，所以我有這個代碼，我正在努力，基本上它將是一個游戲，你必須以句子的形式破解代碼。

我遇到的問題是用代碼中的字符替換句子中的字符。

關鍵字Tiger TIGERABCDFHJKLMNOPQSUVWXYZ就是您替換字符的代碼示例。

基本上字母表成為關鍵字然后剩下的未使用的字母我試圖改變句子中的字符與編碼字母，如果這是有道理的。

但是，當我嘗試多次替換字符時，它不能正確更改字母。

在繼續進行游戲的其余部分之前，我需要這部分的幫助。

import javax.swing.JOptionPane;

public class CodeCrackerGame
/*********************************************************
* Code Cracker Game
*********************************************************/
{
  public static void main(String[] args)
  {

    /********************************************
     * 1st Player's SENTENCE
     *******************************************/
    String sentence = JOptionPane.showInputDialog("Enter sentence to be"
        + "encrypted." + "\nThis sentence can be up to 100 characters,"
        + "\nand has a minimum of 7 words.");

    /*Check if hit cancel or x button*/
    if(sentence == null)
    {
      JOptionPane.showMessageDialog(null, "No input", "ERROR", 
          JOptionPane.ERROR_MESSAGE);
      System.exit(0);
    }
    /*Checks if just hit OK*/
    else if(sentence.equals(""))
    {
      JOptionPane.showMessageDialog(null, "No Input", "ERROR", 
          JOptionPane.ERROR_MESSAGE); 
      System.exit(0);
    }

    /*Check if over 100 characters*/
    if(sentence.length() > 100)
    {
      JOptionPane.showMessageDialog(null, "Input has too many characters", 
          "ERROR", JOptionPane.ERROR_MESSAGE);
      System.exit(0);
    }

    int words = 1;
    int i;
    /*Counts spaces to find amount of words*/
    for (i= 0; i< sentence.length(); i++)
     {
      if(sentence.charAt(i)== ' ') 
       {
        words += 1;
       }
     }
    /*Checks if there are less than 7 words*/
    if(words < 7)
    {
      JOptionPane.showMessageDialog(null, "Not enough words", 
          "ERROR", JOptionPane.ERROR_MESSAGE);
      System.exit(0);
    }

    sentence = sentence.toUpperCase();
    /*Check if not alphabetic and if contains illegal punctuation*/
    for (i= 0; i< sentence.length(); i++)
     {
      if(Character.isLetter(sentence.charAt(i)) == false &&
      sentence.charAt(i)!= '!' && sentence.charAt(i)!= ' ' && 
      sentence.charAt(i)!= ',' && sentence.charAt(i)!= '.' &&
      sentence.charAt(i)!= '?' && sentence.charAt(i)!= '-' &&
      sentence.charAt(i)!= ':' && sentence.charAt(i)!= ';' &&
      sentence.charAt(i)!= '(' && sentence.charAt(i)!= ')' &&
      sentence.charAt(i)!= '[' && sentence.charAt(i)!= ']' &&
      sentence.charAt(i)!= '/' && sentence.charAt(i)!= '\'' &&
      sentence.charAt(i)!= '"') 
       {
          JOptionPane.showMessageDialog(null, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
              + "! , . ? - : ; ( ) [ ] / ' \" are allowed", 
              "ERROR", JOptionPane.ERROR_MESSAGE);
          System.exit(0);
       }
     }

    /*Checks if string ends with . ! ?*/
    char c = sentence.charAt(sentence.length()-1);
    if(c != '.' && c != '!' && c != '?')
    {
      JOptionPane.showMessageDialog(null, "Must end with '.' '!' '?'", 
          "ERROR", JOptionPane.ERROR_MESSAGE);
      System.exit(0);
    }
    /*prints out the sentence*/
    JOptionPane.showMessageDialog(null, sentence, 
        "Your message in all CAPS", JOptionPane.INFORMATION_MESSAGE);

    /**************************************************
     * 1st Player's Keyword
     **************************************************/

    String keyword = JOptionPane.showInputDialog("Enter a keyword"
        + "\nwith up to 10 characters");
    /*Check if hit cancel or x button*/
    if(keyword == null)
    {
      JOptionPane.showMessageDialog(null, "No input", "ERROR", 
              JOptionPane.ERROR_MESSAGE);
      System.exit(0);
    }
    /*Checks if just hit OK*/
    else if(keyword.equals(""))
    {
      JOptionPane.showMessageDialog(null, "No Input", "ERROR", 
          JOptionPane.ERROR_MESSAGE); 
      System.exit(0);
    }

    /*Check if keyword is greater than 10 characters*/
    if(keyword.length() > 10)
    {
      JOptionPane.showMessageDialog(null, "Keyword has too many characters", 
          "ERROR", JOptionPane.ERROR_MESSAGE);
      System.exit(0);
    }
    /*Check if keyword is less than 3 characters*/
    if(keyword.length() < 3)
    {
      JOptionPane.showMessageDialog(null, "Keyword has too little characters", 
          "ERROR", JOptionPane.ERROR_MESSAGE);
      System.exit(0);
    }

    keyword = keyword.toUpperCase();
    /*Check if not alphabetic*/
    for (i= 0; i< keyword.length(); i++)
     {
      if(Character.isLetter(keyword.charAt(i)) == false) 
       {
          JOptionPane.showMessageDialog(null, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
              +" are allowed", 
              "ERROR", JOptionPane.ERROR_MESSAGE);
          System.exit(0);
       }
     }
    /*Removes all duplicate letters from the keyword*/
    String temp = "";
    int position = 0;
    while(position < keyword.length())
    {
      temp = keyword.substring(position + 1);
      temp = temp.replaceAll(keyword.charAt(position) + "", "");
      keyword = keyword.substring(0, position + 1) + temp;
      position ++;
   }
    /*Adds the keyword to the alphabet creating a new alphabet*/
    int x=0;
    String output =("");
    String alpha ="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    while(x <alpha.length())
    { 
      if(keyword.indexOf(alpha.charAt(x)) == -1)
      {
      output=output += alpha.charAt(x);
      }
      x++;
    }

    String map = (keyword + output);
    System.out.println(map);

    String newSentence = sentence;
    newSentence = newSentence.replace(alpha.charAt(0), map.charAt(0));
    newSentence = newSentence.replace(alpha.charAt(1), map.charAt(1));
    newSentence = newSentence.replace(alpha.charAt(2), map.charAt(2));
    newSentence = newSentence.replace(alpha.charAt(3), map.charAt(3));
    newSentence = newSentence.replace(alpha.charAt(4), map.charAt(4));
    newSentence = newSentence.replace(alpha.charAt(5), map.charAt(5));
    newSentence = newSentence.replace(alpha.charAt(6), map.charAt(6));
    newSentence = newSentence.replace(alpha.charAt(7), map.charAt(7));
    newSentence = newSentence.replace(alpha.charAt(8), map.charAt(8));
    newSentence = newSentence.replace(alpha.charAt(9), map.charAt(9));
    newSentence = newSentence.replace(alpha.charAt(10), map.charAt(10));
    newSentence = newSentence.replace(alpha.charAt(11), map.charAt(11));
    newSentence = newSentence.replace(alpha.charAt(12), map.charAt(12));
    newSentence = newSentence.replace(alpha.charAt(13), map.charAt(13));
    newSentence = newSentence.replace(alpha.charAt(14), map.charAt(14));
    newSentence = newSentence.replace(alpha.charAt(15), map.charAt(15));
    newSentence = newSentence.replace(alpha.charAt(16), map.charAt(16));
    newSentence = newSentence.replace(alpha.charAt(17), map.charAt(17));
    newSentence = newSentence.replace(alpha.charAt(18), map.charAt(18));
    newSentence = newSentence.replace(alpha.charAt(19), map.charAt(19));
    newSentence = newSentence.replace(alpha.charAt(20), map.charAt(20));
    newSentence = newSentence.replace(alpha.charAt(21), map.charAt(21));
    newSentence = newSentence.replace(alpha.charAt(22), map.charAt(22));
    newSentence = newSentence.replace(alpha.charAt(23), map.charAt(23));
    newSentence = newSentence.replace(alpha.charAt(24), map.charAt(24));
    newSentence = newSentence.replace(alpha.charAt(25), map.charAt(25));

    System.out.println(newSentence);


    /******************************************
     * 2nd players Guess
     * ****************************************/

    String guess = JOptionPane.showInputDialog(null,sentence + "\n" +
        "Player 2 Enter a guess"
        + "\form example a=b");

}

Answer 1

apache commons lang庫具有實用方法replaceChars() ，它“編碼”一個字符串 - 它正是你需要的。

以下是如何使用它的示例：

 String output = StringUtils.replaceChars(input, 
     "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "TIGERABCDFHJKLMNOPQSUVWXYZ");

Answer 2

查看字符串，用正則表達式全部替換。 你的作業中有太多的重復。 簡化它。