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Table 6-3 contains example EL expressions and the result of evaluating them.

Table 6-3 Example Expressions

EL Expression

Result

${1 > (4/2)}

false

${4.0 >= 3}

true

${100.0 == 100}

true

${(10*10) ne 100}

false

${'a' < 'b'}

true

${'hip' gt 'hit'}

false

${4 > 3}

true

${1.2E4 + 1.4}

12001.4

${3 div 4}

0.75

${10 mod 4}

${!empty param.Add}

False if the request parameter named Add is null or an empty string.

${pageContext.request.contextPath}

The context path.

${sessionScope.cart.numberOfItems}

The value of the numberOfItems property of the session-scoped attribute named cart.

${param['mycom.productId']}

The value of the request parameter named mycom.productId.

${header["host"]}

The host.

${departments[deptName]}

The value of the entry named deptName in the departments map.

${requestScope['javax.servlet.forward.servlet_path']}

The value of the request-scoped attribute named javax.servlet.forward.servlet_path.

#{customer.lName}

Gets the value of the property lName from the customer bean during an initial request. Sets the value of lName during a postback.

#{customer.calcTotal}

The return value of the method calcTotal of the customer bean.

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