JSTL Core <c:choose>, <c:when>, <c:otherwise> Tag

The < c:choose > tag is a conditional tag that establish a context for mutually exclusive conditional operations. It works like a Java switch statement in which we choose between a numbers of alternatives.

The <c:when > is subtag of <choose > that will include its body if the condition evaluated be 'true'.

The < c:otherwise > is also subtag of < choose > it follows &l;twhen > tags and runs only if all the prior condition evaluated is 'false'.

The c:when and c:otherwise works like if-else statement. But it must be placed inside c:choose tag.

JSTL Core <c:choose>, <c:when>, <c:otherwise> Example

Let's see the simple example of < c:choose >, < c:when > < c:otherwise > tag:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>Core Tag Example</title>
</head>
<body>
<c:set var="income" scope="session" value="${4000*4}"/>
<p>Your income is : <c:out value="${income}"/></p>
<c:choose>
    <c:when test="${income <= 1000}">
       Income is not good.
    </c:when>
    <c:when test="${income > 10000}">
        Income is very good.
    </c:when>
    <c:otherwise>
       Income is undetermined...
    </c:otherwise>
</c:choose>
</body>
</html>

This will produce the following result:

Your income is : 16000
Income is very good.

Even/Odd Example using c:when and c:otherwise

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<title>Core Tag Example</title>
</head>
<body>
<h1>JSTL c:when, c:otherwise, c:choose</h1>

<c:set value="10" var="num"></c:set>
<c:choose>
<c:when test="${num%2==0}">
<c:out value="${num} is even number"></c:out>
</c:when>
<c:otherwise>
<c:out value="${num} is odd number"></c:out>
</c:otherwise>
</c:choose>

</body>
</html>

Output:

Next TopicJSTL Core <c:forEach> Tag

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