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JavaServer Faces by Hans Bergsten

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Expressions and Operators

The combination of literal values, variables, and the following operators form an EL expression:

Operator

Precedence

Operation performed

.

1

Access a bean property or Map entry.

[]

1

Access an array or List element.

( )

2

Group a subexpression to change the evaluation order.

? :

10

Conditional test: condition ? ifTrue : ifFalse.

+

5

Addition.

-

5

Subtraction.

-

3

Negation of a value.

*

4

Multiplication.

/ or div

4

Division.

% or mod

4

Modulo (remainder).

== or eq

7

Test for equality.

!= or ne

7

Test for inequality.

< or lt

6

Test for less than.

> or gt

6

Test for greater than.

<= or le

6

Test for less than or equal.

>= or ge

6

Test for greater than or equal.

&& or and

8

Test for logical AND.

|| or or

9

Test for logical OR.

! or not

3

Unary Boolean complement.

empty

3

Test for empty variable values (null or an empty String, array, Map or Collection).

Expressions are evaluated in the order defined by the operator precedence and left to right for operators of the same precedence.

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