Answer / sivasubramanian.k

(1)A declaration tag places a variable definition inside
the body of the java servlet class. Static data members may
be defined as well. Also inner classes should be defined
here.
Example:<%! int serverInstanceVariable = 1; %>

Declaration tags also allow methods to be defined.

<%!
/**
* Converts the Object into a string or if
* the Object is null, it returns the empty string.
*/
public String toStringOrBlank( Object obj ){
if(obj != null){
return obj.toString();
}
return "";
}
%>

(2)A scriptlet tag places the contained statements inside
the _jspService() method of the java servlet class.

<% int localStackBasedVariable = 1;
out.println(localStackBasedVariable); %>

(3)An expression tag places an expression to be evaluated
inside the java servlet class. Expressions should not be
terminated with a semi-colon .

<%= "expanded inline data " + 1 %>

(4)Also we can use the following tag to give comments in
jsp:

<%-- give your comments here --%>

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