Beginning Programming with Java For Dummies (3rd Edition) by Barry Burd

By Barry Burd

One of the preferred starting programming books, now absolutely up-to-date
Java is a well-liked language for starting programmers, and previous variants of this enjoyable and pleasant advisor have helped millions start. Now totally revised to hide contemporary updates for Java 7.0, Beginning Programming with Java For Dummies, third Edition is bound to place extra first-time programmers and Java newbies at the street to Java mastery.* Explores what is going into making a software, placing the items jointly, facing common programming demanding situations, debugging, and making this system paintings * deals new thoughts for instruments and strategies utilized in Java development
* presents useful details and examples for the would-be programmer without Java experience
* All examples are up to date to mirror the newest adjustments in Java 7.0

Beginning Programming with Java For Dummies, third Edition bargains an easy-to-understand advent to programming throughout the renowned, flexible Java 7.0 language.

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Additional info for Beginning Programming with Java For Dummies (3rd Edition)

Example text

The queue was used as the argument in the createProducer method. createProducer(queue); Next, a TextMessage was created using the createTextMessage method. A TextMessage is one of several interfaces derived from the Message interface. These JMS interfaces represent different types of messages used within JMS. The setText method assigned a string to be sent. setText(message); The messageProducer then sent the message. send(textMessage); The output was displayed in the log file used by the SalutationMessageBean.

In the JSPExample-ejb module, we will create a remote session bean called ConstantsBean with methods returning common math constants. We will place it in the packt package. jsp from which we will invoke the EJB. The ConstantsBean is a remote stateless session bean. The bean extends a remote interface, ConstantsBeanRemote, which defines the methods of the bean. These methods include getPI and getGoldenRatio both returning a double value. @Remote public interface ConstantsBeanRemote { public double getPI(); public double getGoldenRatio(); } The ConstantsBean implements this interface and is declared as a stateless session bean.

There are three sections of the JSP page referencing and using the bean. The first section declared the reference variable constantsBean. <%! ConstantsBeanRemote constantsBean; %> The second created the initial context and returned a reference to the bean. Notice the global JNDI name was used to locate the bean. printStackTrace(); } %> The last section used both methods of the ConstantsBean. getGoldenRatio() %> 37 Getting Started With EJBs See also The Accessing the session bean using JNDI recipe, discusses the use of JNDI in more detail.

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