César Cipher avec le code Java - Ne lit que les majuscules

Question

Je suis juste un programmeur débutant, et je suis là pour trouver un bug dans mon programme. Le programme lit uniquement les lettres majuscules dans mon fichier texte, même si j'ai une casse minuscule dans mes méthodes de cryptage et de décryptage. Je suppose que c'est un problème avec la méthode caesarEncipher. (Ignorer mon cas Decipher dans la principale, je vais arriver à bientôt.)

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

public class Cipher { 

    public static void main(String[] args) throws FileNotFoundException { 
     Scanner scan = new Scanner(System.in); 
     System.out.println("Welcome to CaesarCipher"); 
     System.out.println(); 
     System.out.println("Enter 1 to Encipher, 2 to Decipher, or -1 to exit"); 
     int choice = 0; 
     do { 
      choice = scan.nextInt(); 
      if (choice == 1) { 
       System.out.println("What non-negative shift should be used?"); 
       int shift = scan.nextInt(); 
       System.out.println("What is the input file name?"); 
       String input = scan.next(); 
       System.out.println("What is the output file name?"); 
       String output = scan.next(); 
       System.out.println(caesarEncipher(input, shift, output)); 
      } else if (choice == 2) { 

      } else if (choice == -1) { 
       System.out.println("Thank you for using CaesarCipher"); 
       break; 
      } 
     } while (choice != 1 && choice != 2 && choice != -1); 
    } 

    public static String caesarEncipher(String inputString, int shift, String output) throws FileNotFoundException { 
     File outFile = new File(output); 
     PrintStream encoded = new PrintStream(outFile); // creates new file for the output 
     File input = new File(inputString); // creates file with String to scan 
     Scanner scan = new Scanner(input); // creates Scanner 
     while (scan.hasNextLine()) { 
      String cipher = scan.nextLine();   // gets next line of file 
      String encipher = "";     // String to be added to new file 
      int i; 
      for (i = 0; i < cipher.length(); i++) { 
       String curr = cipher.substring(i, i + 1); // current character 
       String newChar = encrypt(curr, shift); 
       encipher = encipher + newChar; 
      } 
      encoded.println(encipher); 
     } 
     encoded.close(); 
     return "DONE"; 
    } 

    public static String encrypt(String str, int shift) { 
     String encrypted = ""; 
     for (int i = 0; i < 1; i++) { 
      int c = str.charAt(i); 
      if (Character.isUpperCase(c)) {//if uppercase 
       c = c + (shift % 26); 
       if (c > 'Z') { //resets if it passes 'Z' 
        c = c - 26; 
       } else if (Character.isLowerCase(c)) {// if lowercase 
        c = c + (shift % 26); 
        if (c > 'z') { // resets if it passes 'z' 
         c = c - 26; 
        } 
       } 
       encrypted = encrypted + (char) c; // adds the encrypted character to the string 
      } 
     } 
     return encrypted; 
    } 

    public static String decrypt(String str, int shift) { 
     String decrypted = ""; 
     for (int i = 0; i < 1; i++) { 
      int c = str.charAt(i); 
      if (Character.isUpperCase(c)) //if uppercase 
      { 
       c = c + (shift % 26); 
       if (c < 'A') { //resets if it passes 'A' 
        c = c + 26; 
       } 
      } else if (Character.isLowerCase(c)) // if lowercase 
      { 
       c = c + (shift % 26); 
       if (c < 'a') { // resets if it passes 'a' 
        c = c + 26; 
       } 
      } 
      decrypted = decrypted + (char) c; // adds the derypted character to the string 
     } 
     return decrypted; 
    } 
} 

Answer 1

Dans encrypt() Méthode: Cette partie du Code

else if(Character.isLowerCase(c)) { 
     c=c+(shift%26); 
     if(c>'z') { 
      c=c-26; 
     } 
    } 
    encrypted=encrypted+(char)c; 

appartient à if(c>'Z') au lieu de if(Character.isUpperCase(c))