EncryptDecrypt

MAIN CLASS
import java.util.Scanner;
public class main
{
    public static void main(String []args){
        Scanner scan = new Scanner(System.in); 
        String choice = "";
        while (!choice.equals("end")){
             System.out.println("Would you like to Encrypt or Decrypt?");
             choice = scan.nextLine();
            if(choice.equals("encrypt")){
            System.out.println("ENTER SOMETHING TO ENCRYPT:");
            String secret = scan.nextLine();
            Encryptor.encrypt(secret);
        }
        else if (choice.equals("decrypt")){
            System.out.println("ENTER SOMETHING TO DECRYPT:");
            String desecret = scan.nextLine();
            Decryptor.decrypt(desecret);
        }
        
    }
}
}

ENCRYPTION CLASS

public class Encryptor {
        public static void encrypt(String s){
            String newStr = ""; //Empty string for later use
            for(int i=0; i<s.length(); i++){  //makes code run for each char   
                char cha = s.charAt(i); //Sets each individual char to var
                if (cha == ' '){ //for spaces 
                    String newOne = Character.toString((char)cha);//char-string
                    newStr = newStr+newOne; //this adds my new created above string to the other one
                }
                else {
                    int OrgCha = (int)cha; 
                    int OrgChara = OrgCha += 4; // shifting the letter 4
                    if (OrgChara > 'z'){ //For letters w x y z 
                        OrgChara -= 26;
                    }
                    char OrgChar = (char)OrgChara; //int of new letter to character
                    String newOne = Character.toString((char)OrgChar);
                    newStr = newStr+newOne;  //adds two strings 
                }
            }
            System.out.println(newStr); //print string 
    }
}

DECRYPTION CLASS
public class Decryptor
{
 public static void decrypt(String s){
        String newStr = "";
            for(int i=0; i<s.length(); i++){     
            char cha = s.charAt(i);
            if (cha == ' '){
               String newOne = Character.toString((char)cha);
               newStr = newStr+newOne;    
            }
            else {int OrgCha = (int)cha;
            int OrgChara = OrgCha -= 4;
            if (OrgChara < 'a'){
                        OrgChara += 26;
                    }
            char OrgChar = (char)OrgChara;
            String newOne = Character.toString((char)OrgChar);
            newStr = newStr+newOne;   
        }
    }
    System.out.println(newStr);
    
}
}