4 u

import java.util.Scanner;
import java.lang.StringBuffer;

public class ShiftCypher {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.println("Please enter a string to encrypt");
        String word = in.nextLine();
        System.out.println("Encrypted: " + encrypt(word, 6));
        //System.out.println("Decrypted: " + decrypt(encrypt(word, 3), 3));
        //String hashed = encrypt(word, 5);
        //crack(hashed);
    }

    static String encrypt(String message, int shift) {
        StringBuilder s = new StringBuilder();
        int length = message.length();
        for(int k=0; k < length; k++) {
            char c = (char)(message.charAt(k));
            if (c == ' ') {
                s.append(' ');
                continue;
            }
            if(c > 'z') {
                s.append((char)(message.charAt(k) - (26-shift)));
            } else  {
                s.append((char)(message.charAt(k) + shift));
            }
        }
        return s.toString();
    }

    static String decrypt(String message, int shift) {
        StringBuilder s = new StringBuilder();
        int length = message.length();
        for (int k=0; k < length; k++) {
            char c = (char)(message.charAt(k));
            if (c == ' ') {
                s.append(' ');
                continue;
            }
            if (c > 'z') {
                s.append((char)(message.charAt(k) - (26-shift)));
            } else {
                s.append((char)(message.charAt(k) - shift));
            }
        }
        return s.toString();
    }

    static void crack(String message) {
        StringBuilder s = new StringBuilder();
        for (int j=0; j < 26; j++) {
            for (int k=0; k < message.length(); k++) {
                char c = (char)(message.charAt(k));
                if (c == ' ') {
                    s.append(' ');
                }
                s.append((char)(message.charAt(k) -  j));
            }
            System.out.println(s);
            s.delete(0, s.length());
        }
    }
}