Crytpo

import java.util.*;

public class crypto {

	public static void main(String[] args) {
		System.out.println("This is a simple encryption program");	  
       System.out.println("Enter some text to have it encrypted");
       Scanner input = new Scanner(System.in);
       String userInput = input.nextLine();
       System.out.println("Enter a number for the caesar cypher.");
       int shift = input.nextInt();
       System.out.println("Enter the number of letters per group.");
       int groups = input.nextInt();
       String cyphertext = encryptString(userInput, shift, groups);
	    System.out.println("This is your encrypted text: " + cyphertext);
	   
	}
		
	
	public static String normalizeText(String userInput) {
			userInput = userInput.replaceAll("[^A-Za-z]","");
             userInput = userInput.toUpperCase();
            // System.out.println("This is your text normalized. "+userInput);
             return userInput;
		}
	public static String shiftAlphabet(int shift) {
	    int start = 0;
	    if (shift < 0) {
	        start = (int) 'Z' + shift + 1;
	    } else {
	        start = 'A' + shift;
	    }
	    String result = "";
	    char currChar = (char) start;
	    for(; currChar <= 'Z'; ++currChar) {
	        result = result + currChar;
	    }
	    if(result.length() < 26) {
	        for(currChar = 'A'; result.length() < 26; ++currChar) {
	            result = result + currChar;
	        }
	    }
	    return result;
	}
	
        public static String caesarify(String userInput, int shift) {
        	 String list = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     	    String shiftedList = shiftAlphabet(shift);
     	    StringBuilder result = new StringBuilder();
     	    for (int i = 0; i < userInput.length(); i++) {
     	      int index = list.indexOf(userInput.charAt(i));
     	      result.append(shiftedList.charAt(index));
     	    }
     	 // System.out.println("This is your caesarfied text. "+result);
     	    return result.toString();
        	}
        public static String groupify(String userInput, int groups) {
    	    StringBuilder result = new StringBuilder();
    	    int textLength = userInput.length();
    	    for (int i = 0; i < textLength; i++) {
    	      result.append(userInput.charAt(i));
    	      if ((i + 1) % groups == 0) {
    	        result.append(" ");
    	      }
    	    }
    	    if (textLength % groups != 0) {
    	      for (int i = 0; i < (groups - textLength % groups); i++) {
    	        result.append('x');
    	      }
    	    }
    	  // System.out.println("This is your ceasarfied and grouped text. "+result);
    	    return result.toString();
    	  }       
        public static String encryptString(String userInput, int shift, int groups) {
    	    String normText = normalizeText(userInput);
    	    String cypherText = caesarify(normText, shift);
    	    String result = groupify(cypherText, groups);
    	   //System.out.println(result);
    	    return result;
    	  }
      
}