java - 将字符串中的每个字母替换为字母表中的下一个字母，但保留空格和标点符号？

Question

我需要用字母表中的下一个字母替换文件中的每个字母(没有使用数字，所以不用担心)。但是我应该保留空格和标点符号。该代码可以很好地更改字母，但我不确定如何保留空格和标点符号。如有任何帮助，我们将不胜感激。

import java.io.*; 
import java.util.*;

class Thirteen{
    public static void main(String [] args)throws IOException{

        Scanner keys = new Scanner(System.in);
        Scanner keystwo;

        System.out.println("Please enter an input file name");
        String filename = keys.next();
        File infile = new File(filename);
        keystwo = new Scanner(infile);

        System.out.println("Please enter an output filename");
        String outputfile = keys.next();
        File outfile = new File(outputfile);

        FileOutputStream outstream = new FileOutputStream(outfile);
        PrintWriter display = new PrintWriter(outstream);

        while(keystwo.hasNext()){

            String one = keystwo.next().toLowerCase();
            //convert to stringbuilder to edit
            StringBuilder fine = new StringBuilder(one);

            for(int A = 0; A < fine.length(); A++){

                //read in as character
                char B = fine.charAt(A);
                //convert to ASCII
                int two = (int)B;
                //add one
                int convert = two+1;
                //convert to char
                char C = (char)convert;
                if(C == '{'){
                    C = 'a';
                }
                //print char & add to output file
                display.print(Character.toString(C));
                System.out.print(Character.toString(C));
            }//end for
        }//end while

        keystwo.close();
        display.close();
    }
}//end

Answer 1

在将转换应用于字符串中的当前字符之前，您可以检查它是否是一个字母，如下所示:

if(Character.isLetter(character))
{
//Do conversion here
}

这样转换将仅应用于字母。