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Explanation

A JSP scriptlet uses <% %> to embed Java statements directly inside a JSP page.

Code:

<%
    String name = "Praveen";
    System.out.println(name);
%>

Explanation

A JSP expression uses <%= %> to evaluate a Java expression and write its result to the response.

Code:

<h2>
    Welcome <%= "Praveen" %>
</h2>

Explanation

A JSP declaration uses <%! %> to declare fields or methods at the servlet class level.

Code:

<%!
    private int count = 0;

    public int getCount() {
        return count;
    }
%>

Explanation

Scriptlets can contain conditions and loops, although modern JSP applications generally prefer JSTL and Expression Language.

Code:

<%
    for (int i = 1; i <= 5; i++) {
%>
    <p>Number: <%= i %></p>
<%
    }
%>

Explanation

Separating Java logic from JSP presentation makes applications cleaner and easier to maintain.

Code:

Preferred:

Servlet → Business Logic
          ↓
       request.setAttribute()
          ↓
JSP → HTML + EL + JSTL