# Understanding JSP
### CASE 1: Try to create method inside <% ,.... %>
```markup
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
Hello
<%!public int sum(int a, int b) {
return a + b;
}%>
Value of sum of 67 and 89 is
<%=sum(67, 89)%>
<%
public int sum1(int a, int b) {
}
return a + b;
int i = 3;
int j = 8;
int k = i + j;
out.println("Value of k is " + k);
%>
<%
int l = 3;
int m = 12;
int n = l + m;
%>
Value of n is
<%=n%>
```
#### We cannot use methods inside <%%>
### CASE 2: We can add html code between the JSP scriplets.
```markup
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
Insert title here
Simple for loop
<% for(int i = 0; i<5; i++) { %>
Value of i is = <%=i %>
<%} %>
```
### Behind the scene :
#### JSP is converted to a class so this test.jsp is converted to a java class
#### Java class is basically a servlet
#### Every jsp is a servlet
#### When we run it on server (tomcat) , tomcat converts jsp to servlet
#### Default is get method , Every <%...%> is converted added to doGet method of the servlet class is generated from JSP.
#### All the HTML code will be put into out.write() by tomcat
#### Thats why method declared inside <%..%> gives the compilation as we cannot define a method inside a method for that we need : <%!..%>