By Jan Graba
ISBN-10: 1447152530
ISBN-13: 9781447152538
ISBN-10: 1447152549
ISBN-13: 9781447152545
Since the second one version of this article, using the net and networks usually has persisted to extend at a gorgeous expense. This has resulted in either a rise well known for community software program and to advancements within the expertise used to run such networks, with the latter certainly resulting in alterations within the former. in this time, the Java libraries were up to date to maintain with the hot advancements in community know-how, in order that the Java programming language is still one of many mainstays of community software program development.
In offering a really readable textual content that avoids getting immersed in low-level technical info, whereas nonetheless delivering an invaluable, useful consultant to community programming for either undergraduates and busy IT pros, this 3rd version maintains the fad of its predecessors. To preserve its forex, the textual content has been up to date to mirror adjustments that experience taken position in Java's community know-how during the last seven years (including the discharge of Java 7), while maintaining its impressive gains of diverse code examples, screenshots and end-of-chapter exercises.
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Extra resources for An Introduction to Network Programming with Java: Java 7 Compatible
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2. 3 Network Programming with GUIs 43 ASK IF USER WANTS TO DO ANOTHER READ/SEND. 4. println( "\n* Unable to close link! append("\n*** No such host! toString() + " ***\n"); } } } Chapter 3 Multithreading and Multiplexing Learning Objectives After reading this chapter, you should: • understand what is meant by a thread (in a programming context); • appreciate the need for multithreaded programming; • be aware of typical circumstances under which multithreading might be appropriate; • know how to implement threads in Java; • know how to implement locking of variables in Java; • be aware of the danger posed by deadlock; • know what Java methods to use in order to improve thread efficiency and reduce the likelihood of deadlock; • know how to implement a multithreaded server; • know how to implement a non-blocking server via multiplexing.
Close(); As was the case in the server code, there is no checked exception generated by the above close method in the finally clause of the client program, so there will be no try block. In addition, since there is no inter-message connection maintained between client and server, there is no protocol required for closing down the dialogue. This means that we do not wish to send the final ‘***CLOSE***’ string (though we shall continue to accept this from the user, since we need to know when to stop sending messages at the client end).
PrintStackTrace(); } 24 2 Starting Network Programming in Java finally //If exception thrown, close connection. close(); //Step 9. } } } Setting up the corresponding client requires the eight steps listed below. 1. Create a DatagramSocket object. This is similar to the creation of a DatagramSocket object in the server program, but with the important difference that the constructor here requires no argument, since a default port (at the client end) will be used. For example: DatagramSocket datagramSocket = new DatagramSocket(); 2.