public boolean isA(TokenClass klassi) {
    if(this.tokens.get(this.currentIndex).getKl() == klassi){
        return true;
    }
    return false;
}
private boolean formalparams(){
        boolean result = formalparam();
        if (result) {
            int index;
            do {
                index = this.currentIndex;
            } while (isA(TokenClass.COMMA) && formalparam());
            this.currentIndex = index;
        }
        return result;
    }