Java ZoneId get Available ZoneId values

import java.time.ZoneId;
import java.util.Set;

public class Main {
        public static void main(String[] args) {
                Set<String> zoneIds = ZoneId.getAvailableZoneIds();
                for (String zoneId: zoneIds) {
                        System.out.println(zoneId);
                }/*from  w w  w . j  a v a 2  s.  c o  m*/
        }
}