EL operators Property Access Operator,Collection Access Operator

EL Operators               

Introduction:

Expression Language (EL) contains its own set of operators the following is the list of all available operators in Expression Language (EL)  .

1.    Property access operator: (.)

2.    Collection access operator :  ([])

3.    Arithmetic Operators

4.    Relational Operators

5.    Logical Operators.

1.   Property Access Operator: (.)

     Syntax:

Ex- ${param.uname}

              Map    key

Ex: ${initParam.password}

             Map        key

Ex: ${customer.age}

            Bean      property

1.  Collection Access Operator : []

Syntax: ${LeftVariable [RightVariable]}

         

LeftVariable   : Map  , Bean ,Array, List        

RightVariable  : Key,Property,index    

                                   

Example for map:

·        $ {initParam[“mail”]}

Example for Bean:

·        $ {customer [“name”]}

Example for Arrays:

<%@ page isELIgnored="false" %> <%@ page import="java.util.*" %> <%       String[ ] s = {"myjavahub", "java2s", "javaken", "java2share" };       pageContext.setAttribute ("s", s); %> ${s[0]}<br>   ${s[1]}<br>   ${s[2]}<br> ${s[3]}<br>    ${s[100]}

Example for List:

<%@ page isELIgnored="false" %> <%@ page import="java.util.*" %> <% List<String> l = new ArrayList<String>();           l.add("myjavahub");           l.add("java2s");           l.add("javaken");           l.add("java2share");           pageContext.setAttribute ("List",l); %> ${List["0"]}<br>   ${List["1"]}<br> ${List["2"]}<br> ${List["3"]}<br>

 Output:

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