Interacting with Networks and Databases - Beginning Java 7 - page 893

Note FormoreinformationonJDBC,checkoutTheJavaTutorial's“JDBC:Data-
base Access” trail at http://download.oracle.com/javase/tutorial/
jdbc/TOC.html .
EXERCISES
ThefollowingexercisesaredesignedtotestyourunderstandingofnetworkAPIsand
JDBC:
1.CreateanetworkedversionofBlackjack—theversionofthisgametoimplement
isdescribedafterthisexercise.Implementa BJDealer applicationthatserves
asthedealeranda BJPlayer applicationthatservesastheplayer. BJDealer
waits for a player connection indication and then creates a background thread
to service the player—this makes it possible for the dealer to play independent
gameswithmultipleplayers.When BJDealer acceptsasocketfromaplayer,
it creates java.io.ObjectInputStream and
java.io.ObjectOutputStream objectsforcommunicatingwiththeplay-
er. Similarly, when BJPlayer creates a socket for communicating with the
dealer, it creates ObjectInputStream and ObjectOutputStream ob-
jects. Because the ObjectInputStream(InputStream in) constructor
blocks until the corresponding ObjectOutputStream instance has written
and flushed a serialization stream header, have each of BJDealer and
BJPlayer immediately call the flush() method on the created Ob-
jectOutputStream instance. BJDealer serializes Card objects and
String -basedstatusmessagesto BJPlayer ; BJPlayer serializes Card ob-
jectsand String -basedcommandsto BJDealer . BJDealer doesn'tpresent
auserinterface,whereas BJPlayer presentstheuserinterfaceshownin Figure
9-6 .