私有枚举构造函数

此构造函数是私有的。那是什么意思？enum

public enum SLocale {

    EN_US(Locale.US, "www.abc.com", "www.edc.com", "www.vvv.com",
            "www.earn.com");

    List<String> domains;
    Locale loc;
    IMap map;

    private SLocale(Locale loc, String... domains) {
        this.domains = Arrays.asList(domains);
        this.loc = loc;
        this.siteMap = Factory.getMap(loc);
    }

    public List<String> getDomains() {
        return domains;
    }

    public Locale getLoc() {
        return loc;
    }

    public ISiteMap getMap() {
        return map;
    }
}