How to integrate a loop in my code

i am new to java my program is getting inputs from user about their car and then it shows the result. But i need to integrate mt "Rövarspråk" in to the code, but i am not really sure how. If the user owns a "Saab" or a "Volvo" the "rövarspråk" loop should change the users "string name". If something is unclear, just tell me and i'll try to explain better

Thanks in advance

public static void main(String[] args) {
    String lookSaab;

    String consonantsx;
    String input;
    String slang;
    String add;
    // String
    int length;
    // int
    Scanner skriv;
    // Scanner

    String reg;
    String year;
    String brand;
    String name;
    String car;
    String when;
    String small;
    String medium;
    String big;
    // String 
    int mod;
    int randomNumber;
    int quota;
    int denominator;
    // int







    reg = JOptionPane.showInputDialog("Ange registreringsnummer");
    year = JOptionPane.showInputDialog("Ange årsmodell"); 
    mod = Integer.parseInt(year); 
    brand = JOptionPane.showInputDialog("Ange bilmärke"); 
    name = JOptionPane.showInputDialog("Ange ägare "
                                           + "(för - och efternamn)"); 
    car = brand + reg;
    Date date = new Date();
    java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("EEE MMM dd");
    when = sdf.format(date);
    denominator = 1500;
    randomNumber = 1500 + (int)(Math.random() * ((40000 - 1500) + 1));
    quota = randomNumber / denominator;

    small = "Liten service";
    medium = "Medium service";
    big = "Stor service";
    if (randomNumber <= 8000){
        JOptionPane.showMessageDialog(null, small, "Typ av service", 1);
    } else if ( randomNumber <= 20000){ 
        JOptionPane.showMessageDialog(null, medium, "Typ av service", 1);
    } else {
        JOptionPane.showMessageDialog(null, big, "Typ av service", 1);
    }

    String resultat = "Bil: " + car + "\n" 
                      + "Årsmodell: " + mod + "\n"  
                      + "Ägare: " + name + "\n"  
                      + "Mästarställning: " + randomNumber + "\n"  
                      + "Inlämnad: " + when + "\n"  
                      + "Klar om: " + quota + " dagar";
    JOptionPane.showMessageDialog(null, resultat, "Resulat", 1);

    lookSaab = "Saab";

    if (brand.equals(lookSaab)){

    }

/**********************************Rövarspråket********************************/

    consonantsx = "bBcCdDeEfFgGhHjJkKlLmMnNpPqQrRsStTvVwWxXzZ"; //Saves all consonants to string
char consonants[] = consonantsx.toCharArray();  //String to charr

System.out.println("Mata in en mening");
skriv = new Scanner(System.in);
input = skriv.nextLine();   //Saves the input
length = input.length();    //Length inc. space
char array[] = input.toCharArray(); // Input to a char array

slang = "";
    System.out.println("På rövarspråk:");
for(int i = 0; i<length; i++) {
        for(int x = 0; x<20; x++){
            if(array[i] == consonants[x])
            {
                add = array[i]+"o"+array[i];
                slang = slang + add;
                break;
            }
            else{
            }
        }
    }
    System.out.println(slang);
}

}