Private доступ на java

Подскажите пожалуйста как правильно использовать private доступ методу.

private static final String[] days = {"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};

public void printDayWeek(int numbDayWeek) {
    if (numbDayWeek >= 1 && numbDayWeek <= 7) {
        System.out.println(days[numbDayWeek - 1]);
    } else {
        System.err.println("Incorrect input data");
    }
}