Method of

Ports/CLDC11/src/java/time/ZoneId.java:12–29

(String zoneId)

    }

    public static ZoneId of(String zoneId) {
        if (zoneId == null) {
            throw new NullPointerException();
        }
        if ("Z".equals(zoneId) || "UTC".equals(zoneId) || "GMT".equals(zoneId)) {
            return ZoneOffset.UTC;
        }
        if (zoneId.startsWith("+") || zoneId.startsWith("-")) {
            return ZoneOffset.of(zoneId);
        }
        if (zoneId.startsWith("UTC+") || zoneId.startsWith("UTC-")) {
            return ZoneOffset.of(zoneId.substring(3));
        }
        if (zoneId.startsWith("GMT+") || zoneId.startsWith("GMT-")) {
            return ZoneOffset.of(zoneId.substring(3));
        }
        return new ZoneId(zoneId);
    }

    public static ZoneId systemDefault() {
        return of(TimeZone.getDefault().getID());