Cipher

Scanner keyboard = new Scanner(System.in); //DAD'S CODE

        String userText;
        int shift = 0;
        String newText = null;

        userText = keyboard.nextLine();
        shift = keyboard.nextInt();
        int userTextnum = userText.length();
        System.out.println(userTextnum);
        String encrypted = null;
        String decrypted = null;
        char [] userTextChars = userText.toCharArray();
        char [] userTextChars2 = userText.toCharArray();
        if (userText != null) {


                    for (int k = 0; ; k++) {

                        char userChar = userText.charAt(k);
                            System.out.println(userChar);
                            int usernum = (int) userChar;
                            System.out.println(usernum);
                            int rem = (usernum + shift) % 126;

                            System.out.println(rem);
                            userTextChars[k] = (char) rem;
                            userText = String.valueOf(userTextChars);
                            encrypted = userText;
                        if (k == userTextnum -1 ) {
                            for (int l = 0; ; l++) {
                                char userChar2 = userText.charAt(l);
                                int usernum2 = (int) userChar2;
                                System.out.println(userChar2);
                                System.out.println(usernum2 - shift);
                                usernum2 = ((((usernum2 - shift) % 126) * 126) / 126) - shift;
                                userTextChars[l] = (char) usernum2;
                                userText = String.valueOf(userTextChars);
                                decrypted = userText;
                                if (l == userTextnum - 1) {
                                    break;
                                }
                            }
                            break;

                       }
                    }
            }
        System.out.println(encrypted);
        System.out.println(decrypted);
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 Scanner keyboard = new Scanner(System.in); //MY CODE

        char [] cipher = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};

        String userText;
        int shift = 0;


        userText = keyboard.nextLine();
        shift = keyboard.nextInt();

        char [] userTextChars = userText.toCharArray();
        if (userText != null) {

            for (int i = 0; i <= 25; i++) {

                if (i == userText.length()) {
                    break;

                } else {
                    for (int k = 0; ; k++) {

                        char userChar = userText.charAt(i);

                        if (userChar == cipher[k]) {

                            int recycle = (k + shift) % cipher.length;
                            userTextChars[i] = cipher[recycle];
                            userText = String.valueOf(userTextChars);

                            break;

                       }
                    }

                }
            }
        System.out.println(userText);


        }
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  Scanner keyboard = new Scanner(System.in); #NEW CODE I WILL USE (SIMPLIFIED)

        String [] alphabet = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
        String wordToNum;
        String numToWord;
        String encrypt = null;
        String decrypt = null;

        wordToNum = keyboard.nextLine();
        numToWord = keyboard.nextLine();

        if (wordToNum != null) {

            for (int i = 0; i <= 25; i++){
                String loopNum = Integer.toString(i);

                wordToNum = wordToNum.replaceAll(alphabet[i], loopNum);

            }

        }

        if (numToWord != null) {

            for (int l = 0; l <= 25; l++){
                String loopNum2 = Integer.toString(l);

                numToWord = numToWord.replaceAll(loopNum2, alphabet[l]);

            }

        }

        System.out.println(wordToNum);
        System.out.println(numToWord);