Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

The action attribute for the Add button is set to the add method in the
calculator bean (line 28). When the Add button is clicked, the add
method in the bean is invoked to add number1 with number2 and assign the
result to result. Since the result property is bound the Result input
text, the new result is now displayed in the text input field.
44.6 Session Tracking
Chapter 43, “JSP,” introduced session tracking using JavaBeans by
sharing the JavaBeans objects among different pages. You can specify the
JavaBeans objects at the application scope, session scope, page scope,
or request scope. JSF supports session tracking using JavaBeans at the
application scope, session scope, and request scope. Additionally, JSF
2.0 supports the view scope, which keeps the bean alive as long as you
stay on the view. The view scope is between session and request scopes.
Consider the following example that prompts the user to guess a number.
When the page starts, the program randomly generates a number between 0
and 99. This number is stored in the session. When the user enters a
guess, the program checks the guess with the random number in the
session and tells the user whether the guess is too high, too low, or
just right, as shown in Figure 44.14.
Figure 44.14
The user enters a guess and the program displays the result.
Here are the steps to develop this project:
Step 1. Create a new managed bean named GuessNumber with the view scope
as shown in Listing 44.9, GuessNumber.java.
23