void createImpl() throws SocketException {
if (impl == null) {
if (factory != null) {
impl = factory.createDatagramSocketImpl();
checkOldImpl();
} else {
boolean isMulticast = (this instanceof MulticastSocket) ? true : false;
impl = DefaultDatagramSocketImplFactory.createDatagramSocketImpl(isMulticast);
checkOldImpl();
}
}
// creates a udp socket
impl.create();
created = true;
}
/**
* Creates an unbound datagram socket with the specified DatagramSocketImpl.
*
* @param impl an instance of a <B>DatagramSocketImpl</B> the subclass wishes to use on the
* DatagramSocket.
* @since 1.4
*/
protected DatagramSocket(DatagramSocketImpl impl) {
if (impl == null) throw new NullPointerException();
this.impl = impl;
checkOldImpl();
}