用不同的字符替换字符串中的所有字符

Question

你好，所以我有这个代码，我正在努力，基本上它将是一个游戏，你必须以句子的形式破解代码。

我遇到的问题是用代码中的字符替换句子中的字符。

关键字Tiger TIGERABCDFHJKLMNOPQSUVWXYZ就是您替换字符的代码示例。

基本上字母表成为关键字然后剩下的未使用的字母我试图改变句子中的字符与编码字母，如果这是有道理的。

但是，当我尝试多次替换字符时，它不能正确更改字母。

在继续进行游戏的其余部分之前，我需要这部分的帮助。

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库具有实用方法replaceChars() ，它“编码”一个字符串 - 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，用正则表达式全部替换。 你的作业中有太多的重复。 简化它。