return new PlainDatagramSocketImpl();
return new PlainDatagramSocketImpl(fd, localPort);
return new PlainMulticastSocketImpl();
return new PlainServerSocketImpl();
return new PlainServerSocketImpl(fd);
return new PlainSocketImpl2();
gets a SocketImpl with specified proxy. return new PlainSocketImpl2(proxy);
return new PlainSocketImpl2(proxy);
return new PlainSocketImpl2(fd, localport, addr, port);