4. JSP Declaration tag


✔ JSP CHAPTERS:-

1. JSP Overview
2. JSP Hello World Example
3. JSP Scriplet Tag
4. JSP Declaration Tag
5. JSP Expression Tag
6. JSP Comment Tag
7. JSP Directives
8. JSP Implicit Objects
9. JSP Action Tags
10. Exception Handling
11. JSP Expression Language



JSP Declaration tag

Declaration tag is used to declare one or more variables or methods at class level. Variables and methods declare in declaration tag are initialized at the time of JSP initialization. These variables and methods are kept outside of the service method by web container to make them class level.
Syntax: <%!  Variable or method Declaration %>

Example:

welcome.jsp
<html>
 <head>
  <title>Declaration tag example</title>
 </head>
 <body>
  <%!
   int sum(int a, int b){
   return a + b;
  }
  %>
 
  <%
   out.println("Sum of 10 and 20 = " + sum(10, 20));
  %>
 </body>
</html>
web.xml
<web-app>
 
  <welcome-file-list>
          <welcome-file>welcome.jsp</welcome-file>
  </welcome-file-list> 
 
</web-app>

Output: