By Cay S. Horstmann, Gary Cornell
Absolutely up to date to mirror Java SE 7 language adjustments, Core Java™, quantity I—Fundamentals, 9th Edition, is the definitive consultant to the Java platform.
Designed for critical programmers, this trustworthy, impartial, no-nonsense instructional illuminates key Java language and library good points with completely confirmed code examples. As in past variants, all code is straightforward to appreciate, displays sleek most sensible practices, and is in particular designed to assist jumpstart your tasks.
Volume I fast brings you up-to-speed on Java SE 7 middle language improvements, together with the diamond operator, greater source dealing with, and catching of a number of exceptions. the entire code examples were up-to-date to mirror those improvements, and entire descriptions of latest SE 7 positive aspects are built-in with insightful factors of primary Java techniques. You’ll study all you should be effective with
- The Java programming environment
- Objects, sessions, and inheritance
- Interfaces and internal classes
- Reflection and proxies
- Graphics programming
- Event dealing with and the development listener model
- Swing-based person interface components
- Application and applet deployment
- Exceptions, logging, assertions, and debugging
- Generic programming
- Concurrency, and more
For exact assurance of complicated gains, together with the recent API for dossier input/output and improvements to the concurrency utilities, search for middle Java™, quantity II—Advanced positive factors, 9th variation (ISBN-13: 978-0-13-708160-8).
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Additional resources for Core Java, Volume 1: Fundamentals (9th Edition)
3 Message Bodies The JMS API defines five message body formats, also called message types, which allow you to send and to receive data in many different forms and provide compatibility with existing messaging formats. 2 describes these message types. String object (for example, the contents of an Extensible Markup Language file). MapMessage A set of name/value pairs, with names as String objects and values as primitive types in the Java programming language. The entries can be accessed sequentially by enumerator or randomly by name.
You can use the setPriority method of the MessageProducer interface to set the priority level for all messages sent by that producer. • You can use the long form of the send or the publish method to set the priority level for a specific message. The third argument sets the priority level. NON_PERSISTENT, 3, 10000); The ten levels of priority range from 0 (lowest) to 9 (highest). If you do not specify a priority level, the default level is 4. A JMS provider tries to deliver higher-priority messages before lower-priority ones but does not have to deliver messages in exact order of priority.
The most reliable way to produce a message is to send a PERSISTENT message within a transaction. JMS messages are PERSISTENT by default. A transaction is a unit of work into which you can group a series of operations, such as message sends and receives, so that the operations either all succeed or all fail. 2 on page 70. The most reliable way to consume a message is to do so within a transaction, either from a nontemporary queue—in the PTP messaging domain—or from a durable subscription—in the pub/sub messaging domain.