Method for Encryption and Decryption with the Viginere Cipher

Viginere.java

public class vigi {
    public static String vigenere(String text, String key, int mode) {
        text = text.toUpperCase();
        text = text.replaceAll(" ", "");
        key = key.toUpperCase();
        String returnText = "";
        for (int i = 0, j = 0; i < text.length(); i++, j++) {
            //i: Zähler für text; j: Zähler für key
            if (j == key.length()) {
                j = 0;
                //Wenn Schlüsselwort durchlaufen, dann wieder von vorne
            }
            if (mode == 1){
                returnText += (char) ((text.charAt(i) + key.charAt(j) - 130) % 26 + 65);
                //Verschlüsselung
            }
            if (mode == 0) {
                returnText += (char) ((text.charAt(i) - key.charAt(j) + 130) % 26 + 65);
                //Entschlüsselung
            }
        }
        return returnText;
    }