723 
 724     private static Set<SocketOption<?>> options;
 725     private static boolean optionsSet = false;
 726 
 727     @Override
 728     public Set<SocketOption<?>> supportedOptions() {
 729         synchronized (MulticastSocket.class) {
 730             if (optionsSet) {
 731                 return options;
 732             }
 733             try {
 734                 DatagramSocketImpl impl = getImpl();
 735                 options = Collections.unmodifiableSet(impl.supportedOptions());
 736             } catch (SocketException ex) {
 737                 options = Collections.emptySet();
 738             }
 739             optionsSet = true;
 740             return options;
 741         }
 742     }

























 743 }

 723 
 724     private static Set<SocketOption<?>> options;
 725     private static boolean optionsSet = false;
 726 
 727     @Override
 728     public Set<SocketOption<?>> supportedOptions() {
 729         synchronized (MulticastSocket.class) {
 730             if (optionsSet) {
 731                 return options;
 732             }
 733             try {
 734                 DatagramSocketImpl impl = getImpl();
 735                 options = Collections.unmodifiableSet(impl.supportedOptions());
 736             } catch (SocketException ex) {
 737                 options = Collections.emptySet();
 738             }
 739             optionsSet = true;
 740             return options;
 741         }
 742     }
 743 
 744     @Override
 745     public synchronized boolean getReuseAddress() throws SocketException {
 746         try {
 747             return super.getReuseAddress() || getOption(StandardSocketOptions.SO_REUSEPORT);
 748         } catch (IOException ex) {
 749             SocketException se = new SocketException(ex.getMessage());
 750             se.addSuppressed(ex);
 751             throw se;
 752         }
 753     }
 754 
 755     @Override
 756     public synchronized void setReuseAddress(boolean on) throws SocketException {
 757         super.setReuseAddress(on);
 758         if (supportedOptions().contains(StandardSocketOptions.SO_REUSEPORT)) {
 759             try {
 760                 setOption(StandardSocketOptions.SO_REUSEPORT, on);
 761             } catch (IOException ex) {
 762                 SocketException se = new SocketException(ex.getMessage());
 763                 se.addSuppressed(ex);
 764                 throw se;
 765             }
 766         }
 767     }
 768 }