Hi guys, I'm currently taking a unit where we're using Netbeans. In one of my tutes, we were asked to just do a simple form that takes 2 integers as input and then outputs the result after the user clicks on a button.

The following is the code for the form which my lecturer provided:
<f:view>

    <h:form id="AddForm">
        <h:inputText id="First" value="#{First}"/>      
        +
        <h:inputText id="Second" value="#{Second}"/>
        <h:commandButton id="submit" action="Success" value="="/>
        <% Sum = First + Second; %>
        <h:outputText id="Sum" value="#{Sum}"/>
     </h:form>

</f:view>

The problem is with this line:

        <h:outputText id="Sum" value="#{Sum}"/>

As it is, the form will not display the variable "Sum", which is the result of adding "First" and "Second". In fact, it displays nothing.

However, when changed to this:

        <h:outputText id="Sum" value="#{First + Second}"/>

The result is displayed.

Could anybody please tell me why it is like this?

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