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Explanation

JSTL provides standard tags for common JSP operations such as conditions, loops, formatting, and URL handling.

Code:

<%@ taglib prefix="c"
    uri="jakarta.tags.core" %>

<c:if test="${user != null}">
    Welcome!
</c:if>

Explanation

Expression Language allows JSP pages to access Java objects and values without writing Java scriptlets.

Code:

${user.name}
${user.email}
${sessionScope.username}

Explanation

Use c:forEach to iterate through a collection in a JSP page.

Code:

<c:forEach var="user" items="${users}">
    <p>${user.name}</p>
</c:forEach>

Explanation

Use JSTL conditional tags instead of Java if statements directly inside JSP pages.

Code:

<c:choose>
    <c:when test="${user.admin}">
        Admin
    </c:when>
    <c:otherwise>
        User
    </c:otherwise>
</c:choose>

Explanation

EL supports property access, arithmetic, logical operators, and conditional expressions.

Code:

${user.age >= 18}
${user.name}
${price * quantity}
${empty users}