Basic Operators¶
EL supports most of the arithmetic and logic operators provided by Java.
Operator List¶
Operator | Description |
|---|---|
. | Accesses a Bean property or a mapping entry. |
[] | Accesses an array or linked list. |
() | Organizes a subexpression to change priority. |
Plus sign | |
| Minus or negative sign |
* | Multiplication sign |
/ or div | Division sign |
% or mod | Modulo |
== or eq | Test whether equal to. |
!= or ne | Test whether unequal to. |
< or lt | Test whether less than. |
> or gt | Test whether greater than. |
<= or le | Check whether less than or equal to. |
>= or ge | Test whether greater than or equal to. |
&& or and | Test logic and. |
|| or or | Test logic or. |
! or not | Test negation. |
empty | Test whether empty. |
?: | The expression is similar to if else. If the statement in front of ? is true, the value of the expression between ? and : is returned. Otherwise, the value following : is returned. |
Example¶
If variable a is empty, default is returned. If variable a is not empty, a itself is returned. The EL expression is as follows:
#{empty a?"default":a}