Examples of EL Expressions - The Java EE 6 Tutorial (original) (raw)

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}	2
${!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 nameddeptName 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.