Class Definition, creation of DomainParticipant and Topic of HelloSubscriber

HelloSubscriberBeginning.java

public class HelloSubscriber extends DataReaderAdapter {

// For clean shutdown sequence
private static boolean shutdown_flag = false;

public static final void main(String[] args) {

// Create the DDS Domain participant on domain ID 0
DomainParticipant participant = DomainParticipantFactory.get_instance().create_participant(
	0,							// Domain ID = 0
	DomainParticipantFactory.PARTICIPANT_QOS_DEFAULT,	// QoS
	null,							// listener
	StatusKind.STATUS_MASK_NONE);				// mask
if (participant == null) {
System.err.println("Unable to create domain participant");
       return;
}

// Create the topic "Hello World" for the String type
Topic topic = participant.create_topic(
	"Hello, World", 			// Topic Name
	StringTypeSupport.get_type_name(), 	// Topic Data Type
	DomainParticipant.TOPIC_QOS_DEFAULT, 	// QoS
	null, 					// listener
	StatusKind.STATUS_MASK_NONE);		// mask
if (topic == null) {
	System.err.println("Unable to create topic.");
	return;
}