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:

 <
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>
<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>
<web-app>
	
  <welcome-file-list>
          <welcome-file>welcome.jsp</welcome-file>
  </welcome-file-list>	

</web-app>

Output: 
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