To add a declaration, you must use <%! And %> to enclose your statement, for example:
<% @ Page import = "Java. util. *" %>
<HTML>
<Body>
<%!
Date thedate = new date ();
Date getdate ()
{
System. Out. println ("in getdate () method ");
Return thedate;
}
%>
Hello! The time is now <% = getdate () %>
</Body>
</Html>
The variables and methods have been declared in the above example: A Date variable thedate and a method getdate. The two are valid in scriptlets and expressions since they have been defined.
However, unfortunately, the above example does not work properly: No matter how heavy the page is, the date is the same. The reason is that these declarations are calculated only once when the webpage is loaded. This is like creating a class in Visual C ++ and defining the initialization value of the variable.
The exercise in this tutorial is: Modify the example above and add another function computedate to reinitialize thedate. Add a scriptlet to call computedate each time.
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